This research study focuses on providing evidence that indicates that, making use of contemporary green building practices within a low cost subsidised housing project have more social, economical as well as environmental benefits than that of a conventional, non-green approach. Low cost subsidised housing units have become an everyday sight in the light of the global as well as the local economy. The increasing levels of unemployment and subsequent social problems lead to growing needs for this form of housing. As these projects consume a number of resources, steps need be taken to lighten the load – such as the carbon emissions - that is put on the environment. According to the United Nations, the key areas that are influenced by sustainability are environmental, economical as well as social. In South Africa, a number of government as well as local policies exist that regulates the planning and building practices of the low cost subsidised housing projects. These policies have been used as a foundation for this study. This study focuses on the Lufhereng project as a case study, and technology used in the Kuyasa as well as Cosmo City developments furthermore assisted in the groundwork for the comparison between the different construction approaches. The challenges facing the utilisation of a contemporary green building approach were researched, identified, discussed and recommendations were made. SAM (social accounting matrix) multiplier analysis on the Gauteng SAM obtained from the DBSA (Development Bank of South Africa), analysis and comparison of existing data as well as a qualitative questionnaire that was sent to industry stakeholders were utilised to obtain relevant information. The quantitative as well as qualitative data obtained from the primary as well as secondary research indicated that there are a number of aspects which has an influence on method of construction used in subsidised low cost housing units. The findings from literature as well as empirical research were analysed and discussed accordingly. Recommendations and suggestions regarding strategies that may be followed to increase the use of contemporary green approaches in these projects were made. These recommendations were based on the findings from literature as well as the research conducted for this study. The use of contemporary green approaches are vital for the social, economic as well as environmental sustainability of the country, and thus, ultimately of the world as a whole. It is, in this light, imperative that everything in our power should be done to preserve our resources by any means possible. / PhD (Urban and Regional Planning), North-West University, Potchefstroom Campus, 2013

This research study focuses on providing evidence that indicates that, making use of contemporary green building practices within a low cost subsidised housing project have more social, economical as well as environmental benefits than that of a conventional, non-green approach. Low cost subsidised housing units have become an everyday sight in the light of the global as well as the local economy. The increasing levels of unemployment and subsequent social problems lead to growing needs for this form of housing. As these projects consume a number of resources, steps need be taken to lighten the load – such as the carbon emissions - that is put on the environment. According to the United Nations, the key areas that are influenced by sustainability are environmental, economical as well as social. In South Africa, a number of government as well as local policies exist that regulates the planning and building practices of the low cost subsidised housing projects. These policies have been used as a foundation for this study. This study focuses on the Lufhereng project as a case study, and technology used in the Kuyasa as well as Cosmo City developments furthermore assisted in the groundwork for the comparison between the different construction approaches. The challenges facing the utilisation of a contemporary green building approach were researched, identified, discussed and recommendations were made. SAM (social accounting matrix) multiplier analysis on the Gauteng SAM obtained from the DBSA (Development Bank of South Africa), analysis and comparison of existing data as well as a qualitative questionnaire that was sent to industry stakeholders were utilised to obtain relevant information. The quantitative as well as qualitative data obtained from the primary as well as secondary research indicated that there are a number of aspects which has an influence on method of construction used in subsidised low cost housing units. The findings from literature as well as empirical research were analysed and discussed accordingly. Recommendations and suggestions regarding strategies that may be followed to increase the use of contemporary green approaches in these projects were made. These recommendations were based on the findings from literature as well as the research conducted for this study. The use of contemporary green approaches are vital for the social, economic as well as environmental sustainability of the country, and thus, ultimately of the world as a whole. It is, in this light, imperative that everything in our power should be done to preserve our resources by any means possible. / PhD (Urban and Regional Planning), North-West University, Potchefstroom Campus, 2013

A alvenaria estrutural vem ganhando um grande impulso no Brasil ao longo das últimas décadas, sendo cada vez mais utilizada, principalmente em empreendimentos habitacionais de interesse social. No caso específico do Estado do Rio Grande do Sul, nos últimos dois anos, a maioria dos empreendimentos habitacionais de baixa renda foram executados com esse processo construtivo. Por exigência dos órgãos financiadores destes tipos de empreendimentos, as empresas construtoras dos mesmos devem ser possuidoras de certificação do seu sistema de gestão da qualidade. Entretanto, apesar desta certificação, tem-se observado a presença de manifestações patológicas, com predominância de fissuras, nos empreendimentos de baixa renda, por elas executadas. As causas das manifestações patológicas em empreendimentos construídos em alvenaria estrutural têm sido objeto de estudo de diversas pesquisas. Porém, não se fez até então um estudo das possíveis causas destas manifestações do ponto de vista multicausal, envolvendo as várias etapas do processo construtivo. Neste sentido, a presente pesquisa teve como objetivo principal analisar as relações de causa e efeito entre as fissuras dos empreendimentos construídos em alvenaria estrutural e as suas causas, utilizando-se de ferramentas de melhorias da qualidade que adotam uma visão multi-casual, muito utilizadas em outras indústrias Para este estudo foram utilizados relatórios de monitoramento de execução de empreendimentos que pertencem aos modos de provisão habitacional do Programa de Arrendamento Residencial (PAR) e Imóvel na Planta (IP), no Estado do Rio Grande do Sul, ambos gerenciados pela Caixa Econômica Federal. A pesquisa consistiu em: (a) revisão bibliográfica; (b) levantamento e análise dos dados provenientes dos relatórios, identificando falhas, recomendações técnicas e boas práticas adotadas pelas empresas construtoras; (c) aplicação de um método de análise de relações de causa e efeito composto por ferramentas da qualidade; e (d) geração de mapas de relações de causa e efeito, recomendações para tratamento das principais causas e listagem de algumas boas práticas construtivas. Através desta pesquisa foi possível verificar as principais falhas ao longo do processo construtivo em vários níveis de análise e analisar as relações de causa e efeito entre eles e propor uma priorização de melhorias da qualidade. Com base nesta priorização foi sistematizado um conjunto de recomendações técnicas e de boas práticas que podem ser disseminadas entre as empresas construtoras tendo em vista a melhoria da qualidade dos empreendimentos em estudo. / Structural masonry has had a substantial development in Brazil in the last few decades, becoming increasingly important, especially in social interest housing projects. In the specific case of Rio Grande do Sul, in the last two years, most low cost housing projects have been built using this construction process. Due to the demand of the funding organizations, the construction companies that build those projects must have a certified quality management system. However, despite this certification, a large number of building pathologies have been observed in those projects, especially cracks. In fact, the causes of building pathologies in structural masonry buildings have been the focus of several research studies. However, very little has been investigated on the causes of those pathologies from a multi-causal perspective, considering several stages of the construction process. The main objective of this research work is to analyze the cause-effect relationships between cracks in structural masonry buildings and their causes, using quality improvement tools that provide such multi-causal perspective, widely used in other industries. This study was based on quality monitoring reports of projects from two housing programs, the Residential Leasing Program (PAR) and the Blue-print Program (IP), in the State of Rio Grande do Sul. Both programs are managed by the National Savings Bank. The research study consisted of: (a) a literature review; (b) data collection and analysis using those reports, with the aim of identifying building failures, necessary improvements, and good practices adopted by construction companies; (c) application of a method for analyzing the cause-effect relationships which combined a set of quality tools; (d) development of cause-effect relationship maps, proposition of a set of improvements and a production of a list of good practices. Based on this study, it was possible to identify failures in the construction process, as well as to analyze the cause-effect relationships and propose some priorities in terms of improvements measures. Based on those priorities, a set of technical recommendations was established, as well as a list of good practices that should be disseminated among construction companies, in order to improve the quality of low-cost housing projects.

No Brasil, o amplo incentivo e a disponibilidade de financiamento à produção habitacional de baixa renda, nos últimos anos têm estimulado a padronização do produto e aplicação de conceitos de produção em massa neste setor. No entanto, a entrega de produtos altamente padronizados a clientes com diferentes necessidades, desconsiderando seus modos de vida e percepções de valor, frequentemente resulta em produtos inadequados, os quais necessitam ser modificados logo após a entrega. A customização em massa tem se destacado como uma estratégia para aprimorar a geração de valor e aumentar o grau de satisfação de clientes na indústria da manufatura. No contexto da habitação de baixa renda, a definição de um conjunto de opções relevantes do ponto de vista dos clientes, baseado na sua percepção de valor, é um dos principais desafios para a implementação desta estratégica. O objetivo da presente pesquisa consiste em propor um método para identificar atributos customizáveis da empreendimentos habitacionais customizados, baseado em um modelo conceitual denominado cadeia meios-fim. Este modelo foi adaptado ao contexto de habitação de baixa renda, de forma a ser utilizado para relacionar os atributos do produto com os valores dos clientes, por meio da aplicação da técnica laddering. Além disso, a pesquisa tem como objetivo específico desenvolver dispositivos visuais que apoiem a tomada de decisão sobre a oferta de espaços de solução para unidades habitacionais customizadas. Com o objetivo de testar a aplicabilidade da solução desenvolvida, foram realizados dois estudos empíricos. O primeiro estudo foi desenvolvido para o segmento de mercado específico de uma empresa construtora de habitações, enquanto no segundo estudo fez-se a comparação de quatro segmentos de mercado delineados no Programa Minha Casa Minha Vida. A principal contribuição do método proposto é indicar as unidades de customização que são mais relevantes para os clientes finais e modelar a geração de valor na perspectiva dos usuários finais, de forma a entender as prioridades estabelecidas pelos mesmos. Além disso, os resultados permitem entender diferenças sobre a geração de valor para diferentes perfis de clientes e identificar oportunidades de melhoria em produtos habitacionais existentes. / In Brazil, high incentives and availability of funding for low-cost housing projects, in recent years, have encouraged product standardization and the application of mass production ideas in that sector. However, the delivery of highly standardized housing units to customers with different requirements, without considering their lifestyles and perceptions of value, often results in inadequate products, which need to be modified soon after delivery. Mass customization has been pointed out as an effective strategy to improve value generation and increase the degree of client satisfaction in the manufacturing industry. In the context of low-cost housing, the definition of a set of relevant options from the point of view of clients, based on their perceptions of value, is a major challenge for the implementation of this strategy. The aim of this research work is to propose a method for identifying value-adding attributes in customized housing projects, based on a conceptual model named means-end chain. That model was adapted to the low-cost housing context in order to connect product attributes to clients’ values, by applying the laddering technique. Besides, this investigation has the secondary aim of devising visual devices that can support decision-making related to the solution space of customised housing units. Two empirical studies were carried out in order to assess the applicability of the proposed solution. The first study was developed considering the specific market segment of a house-building company, while in the second study a comparison was made between four segments of the My House My Life Program. The main contribution of the proposed method is to identify which customization units are the most relevant ones for the final clients, as well as to model value generation from the point of view of clients, with the aim of understanding the priorities established by them. Moreover, the results explain differences in value generation for distinct client profiles, and identify improvement opportunities for existing housing products.

Main concerns in the building industry includes the development of alternative building materials that reduces the amount of energy spent during manufacturing process and easier to work with. Wood-crete is a composite material developed in this study, made up of wood waste (sawdust), paper, tradical lime and water. Wood-crete is developed to provide an alternative material in construction solving problems associated with the delivery of low-cost housing across all income earners, reducing the amount of energy spent during manufacturing process of construction materials and the ease with which these construction materials are developed and solve issues related to waste management. This thesis presents the processing technologies, factors which affect the performance and properties of wood-crete. Wood-crete properties were found to be closely related to the composition of the constituent elements though compressive strength and modulus of elasticity were low when compared to other building materials like concrete and steel. In a bid to improve the strength of the developed wood-crete, the properties were investigated based on the modification of sawdust by hot water boiling and alkaline treatments which help to modify cellulose fibre surface to reduce the hydrophilic nature of sawdust thereby improving the sawdust-matrix bonding. It was found that the surface modification, processing of cellulosic fibril and the extraction of lignin and hemi-cellulosic compounds with alkali had an effect on the compressive strength of wood-crete, with treating sawdust with 4% NaOH at 140mins of boiling time achieving the highest compressive strength and boiling sawdust from 100mins to 140mins had a gradual increase in compressive strength but reduced at higher boiling time. Furthermore, treating sawdust with NaOH more than 4% weakened the individual wood particles thus leading to poor strength of wood-crete. Additionally, the properties of wood-crete were investigated based on the type of wood sawdust – hardwood (beech and oak) and softwood (pine and cedar). Apart from individual wood density having a significant effect on the density of wood-crete, other factors such as lignin, cellulose, hemicellulose contents including fibre length of individual wood species affect the strength properties of wood-crete. The compressive strength of wood-crete was closely related to the wood species, with highest compressive strength of 3.93MPa recorded for hardwood wood-crete compared to 1.37MPa and 0.26MPa of wood-crete from softwood and mixed wood respectively. Results from thermal conductivity tests on wood-crete also show that wood-crete blocks can be produced with good insulating properties for building construction. Addition of different types of paper fibres to reduce the density of wood-crete and improve the insulating properties of composite developed also had a dominant influence on both strength and thermal conductivity, reflecting its effect on the structure of composite and contribution of self strength of paper fibres. The addition of various percentages of waste paper (de-fibred) had a significant influence on the thermal conductivity of wood-crete with 75% addition of waste paper achieving a thermal conductivity value of 0.046W/mK performed with the TCi thermal conductivity analyser. Thermal conductivity results for wood-crete made from hardwood and softwood sawdust was closely related to the chemical composition of various wood species, with softwood wood-crete having about 20% lower thermal conductivity compared to hardwood wood-crete. The developed wood-crete was able to withstand impact load and considered, like hempcrete, most suitable for wall panelling or other non- and semi-structural applications with good thermal insulating properties. Findings of this study provides an alternative new material for the construction industry and an important background for achieving better strength of wood-crete, choosing what type of sawdust to be used for development of wood-crete and for directing a better use of this potential material with very small embodied energy and carbon negative.

A alvenaria estrutural vem ganhando um grande impulso no Brasil ao longo das últimas décadas, sendo cada vez mais utilizada, principalmente em empreendimentos habitacionais de interesse social. No caso específico do Estado do Rio Grande do Sul, nos últimos dois anos, a maioria dos empreendimentos habitacionais de baixa renda foram executados com esse processo construtivo. Por exigência dos órgãos financiadores destes tipos de empreendimentos, as empresas construtoras dos mesmos devem ser possuidoras de certificação do seu sistema de gestão da qualidade. Entretanto, apesar desta certificação, tem-se observado a presença de manifestações patológicas, com predominância de fissuras, nos empreendimentos de baixa renda, por elas executadas. As causas das manifestações patológicas em empreendimentos construídos em alvenaria estrutural têm sido objeto de estudo de diversas pesquisas. Porém, não se fez até então um estudo das possíveis causas destas manifestações do ponto de vista multicausal, envolvendo as várias etapas do processo construtivo. Neste sentido, a presente pesquisa teve como objetivo principal analisar as relações de causa e efeito entre as fissuras dos empreendimentos construídos em alvenaria estrutural e as suas causas, utilizando-se de ferramentas de melhorias da qualidade que adotam uma visão multi-casual, muito utilizadas em outras indústrias Para este estudo foram utilizados relatórios de monitoramento de execução de empreendimentos que pertencem aos modos de provisão habitacional do Programa de Arrendamento Residencial (PAR) e Imóvel na Planta (IP), no Estado do Rio Grande do Sul, ambos gerenciados pela Caixa Econômica Federal. A pesquisa consistiu em: (a) revisão bibliográfica; (b) levantamento e análise dos dados provenientes dos relatórios, identificando falhas, recomendações técnicas e boas práticas adotadas pelas empresas construtoras; (c) aplicação de um método de análise de relações de causa e efeito composto por ferramentas da qualidade; e (d) geração de mapas de relações de causa e efeito, recomendações para tratamento das principais causas e listagem de algumas boas práticas construtivas. Através desta pesquisa foi possível verificar as principais falhas ao longo do processo construtivo em vários níveis de análise e analisar as relações de causa e efeito entre eles e propor uma priorização de melhorias da qualidade. Com base nesta priorização foi sistematizado um conjunto de recomendações técnicas e de boas práticas que podem ser disseminadas entre as empresas construtoras tendo em vista a melhoria da qualidade dos empreendimentos em estudo. / Structural masonry has had a substantial development in Brazil in the last few decades, becoming increasingly important, especially in social interest housing projects. In the specific case of Rio Grande do Sul, in the last two years, most low cost housing projects have been built using this construction process. Due to the demand of the funding organizations, the construction companies that build those projects must have a certified quality management system. However, despite this certification, a large number of building pathologies have been observed in those projects, especially cracks. In fact, the causes of building pathologies in structural masonry buildings have been the focus of several research studies. However, very little has been investigated on the causes of those pathologies from a multi-causal perspective, considering several stages of the construction process. The main objective of this research work is to analyze the cause-effect relationships between cracks in structural masonry buildings and their causes, using quality improvement tools that provide such multi-causal perspective, widely used in other industries. This study was based on quality monitoring reports of projects from two housing programs, the Residential Leasing Program (PAR) and the Blue-print Program (IP), in the State of Rio Grande do Sul. Both programs are managed by the National Savings Bank. The research study consisted of: (a) a literature review; (b) data collection and analysis using those reports, with the aim of identifying building failures, necessary improvements, and good practices adopted by construction companies; (c) application of a method for analyzing the cause-effect relationships which combined a set of quality tools; (d) development of cause-effect relationship maps, proposition of a set of improvements and a production of a list of good practices. Based on this study, it was possible to identify failures in the construction process, as well as to analyze the cause-effect relationships and propose some priorities in terms of improvements measures. Based on those priorities, a set of technical recommendations was established, as well as a list of good practices that should be disseminated among construction companies, in order to improve the quality of low-cost housing projects.

No Brasil, o amplo incentivo e a disponibilidade de financiamento à produção habitacional de baixa renda, nos últimos anos têm estimulado a padronização do produto e aplicação de conceitos de produção em massa neste setor. No entanto, a entrega de produtos altamente padronizados a clientes com diferentes necessidades, desconsiderando seus modos de vida e percepções de valor, frequentemente resulta em produtos inadequados, os quais necessitam ser modificados logo após a entrega. A customização em massa tem se destacado como uma estratégia para aprimorar a geração de valor e aumentar o grau de satisfação de clientes na indústria da manufatura. No contexto da habitação de baixa renda, a definição de um conjunto de opções relevantes do ponto de vista dos clientes, baseado na sua percepção de valor, é um dos principais desafios para a implementação desta estratégica. O objetivo da presente pesquisa consiste em propor um método para identificar atributos customizáveis da empreendimentos habitacionais customizados, baseado em um modelo conceitual denominado cadeia meios-fim. Este modelo foi adaptado ao contexto de habitação de baixa renda, de forma a ser utilizado para relacionar os atributos do produto com os valores dos clientes, por meio da aplicação da técnica laddering. Além disso, a pesquisa tem como objetivo específico desenvolver dispositivos visuais que apoiem a tomada de decisão sobre a oferta de espaços de solução para unidades habitacionais customizadas. Com o objetivo de testar a aplicabilidade da solução desenvolvida, foram realizados dois estudos empíricos. O primeiro estudo foi desenvolvido para o segmento de mercado específico de uma empresa construtora de habitações, enquanto no segundo estudo fez-se a comparação de quatro segmentos de mercado delineados no Programa Minha Casa Minha Vida. A principal contribuição do método proposto é indicar as unidades de customização que são mais relevantes para os clientes finais e modelar a geração de valor na perspectiva dos usuários finais, de forma a entender as prioridades estabelecidas pelos mesmos. Além disso, os resultados permitem entender diferenças sobre a geração de valor para diferentes perfis de clientes e identificar oportunidades de melhoria em produtos habitacionais existentes. / In Brazil, high incentives and availability of funding for low-cost housing projects, in recent years, have encouraged product standardization and the application of mass production ideas in that sector. However, the delivery of highly standardized housing units to customers with different requirements, without considering their lifestyles and perceptions of value, often results in inadequate products, which need to be modified soon after delivery. Mass customization has been pointed out as an effective strategy to improve value generation and increase the degree of client satisfaction in the manufacturing industry. In the context of low-cost housing, the definition of a set of relevant options from the point of view of clients, based on their perceptions of value, is a major challenge for the implementation of this strategy. The aim of this research work is to propose a method for identifying value-adding attributes in customized housing projects, based on a conceptual model named means-end chain. That model was adapted to the low-cost housing context in order to connect product attributes to clients’ values, by applying the laddering technique. Besides, this investigation has the secondary aim of devising visual devices that can support decision-making related to the solution space of customised housing units. Two empirical studies were carried out in order to assess the applicability of the proposed solution. The first study was developed considering the specific market segment of a house-building company, while in the second study a comparison was made between four segments of the My House My Life Program. The main contribution of the proposed method is to identify which customization units are the most relevant ones for the final clients, as well as to model value generation from the point of view of clients, with the aim of understanding the priorities established by them. Moreover, the results explain differences in value generation for distinct client profiles, and identify improvement opportunities for existing housing products.

No Brasil, o amplo incentivo e a disponibilidade de financiamento à produção habitacional de baixa renda, nos últimos anos têm estimulado a padronização do produto e aplicação de conceitos de produção em massa neste setor. No entanto, a entrega de produtos altamente padronizados a clientes com diferentes necessidades, desconsiderando seus modos de vida e percepções de valor, frequentemente resulta em produtos inadequados, os quais necessitam ser modificados logo após a entrega. A customização em massa tem se destacado como uma estratégia para aprimorar a geração de valor e aumentar o grau de satisfação de clientes na indústria da manufatura. No contexto da habitação de baixa renda, a definição de um conjunto de opções relevantes do ponto de vista dos clientes, baseado na sua percepção de valor, é um dos principais desafios para a implementação desta estratégica. O objetivo da presente pesquisa consiste em propor um método para identificar atributos customizáveis da empreendimentos habitacionais customizados, baseado em um modelo conceitual denominado cadeia meios-fim. Este modelo foi adaptado ao contexto de habitação de baixa renda, de forma a ser utilizado para relacionar os atributos do produto com os valores dos clientes, por meio da aplicação da técnica laddering. Além disso, a pesquisa tem como objetivo específico desenvolver dispositivos visuais que apoiem a tomada de decisão sobre a oferta de espaços de solução para unidades habitacionais customizadas. Com o objetivo de testar a aplicabilidade da solução desenvolvida, foram realizados dois estudos empíricos. O primeiro estudo foi desenvolvido para o segmento de mercado específico de uma empresa construtora de habitações, enquanto no segundo estudo fez-se a comparação de quatro segmentos de mercado delineados no Programa Minha Casa Minha Vida. A principal contribuição do método proposto é indicar as unidades de customização que são mais relevantes para os clientes finais e modelar a geração de valor na perspectiva dos usuários finais, de forma a entender as prioridades estabelecidas pelos mesmos. Além disso, os resultados permitem entender diferenças sobre a geração de valor para diferentes perfis de clientes e identificar oportunidades de melhoria em produtos habitacionais existentes. / In Brazil, high incentives and availability of funding for low-cost housing projects, in recent years, have encouraged product standardization and the application of mass production ideas in that sector. However, the delivery of highly standardized housing units to customers with different requirements, without considering their lifestyles and perceptions of value, often results in inadequate products, which need to be modified soon after delivery. Mass customization has been pointed out as an effective strategy to improve value generation and increase the degree of client satisfaction in the manufacturing industry. In the context of low-cost housing, the definition of a set of relevant options from the point of view of clients, based on their perceptions of value, is a major challenge for the implementation of this strategy. The aim of this research work is to propose a method for identifying value-adding attributes in customized housing projects, based on a conceptual model named means-end chain. That model was adapted to the low-cost housing context in order to connect product attributes to clients’ values, by applying the laddering technique. Besides, this investigation has the secondary aim of devising visual devices that can support decision-making related to the solution space of customised housing units. Two empirical studies were carried out in order to assess the applicability of the proposed solution. The first study was developed considering the specific market segment of a house-building company, while in the second study a comparison was made between four segments of the My House My Life Program. The main contribution of the proposed method is to identify which customization units are the most relevant ones for the final clients, as well as to model value generation from the point of view of clients, with the aim of understanding the priorities established by them. Moreover, the results explain differences in value generation for distinct client profiles, and identify improvement opportunities for existing housing products.

A alvenaria estrutural vem ganhando um grande impulso no Brasil ao longo das últimas décadas, sendo cada vez mais utilizada, principalmente em empreendimentos habitacionais de interesse social. No caso específico do Estado do Rio Grande do Sul, nos últimos dois anos, a maioria dos empreendimentos habitacionais de baixa renda foram executados com esse processo construtivo. Por exigência dos órgãos financiadores destes tipos de empreendimentos, as empresas construtoras dos mesmos devem ser possuidoras de certificação do seu sistema de gestão da qualidade. Entretanto, apesar desta certificação, tem-se observado a presença de manifestações patológicas, com predominância de fissuras, nos empreendimentos de baixa renda, por elas executadas. As causas das manifestações patológicas em empreendimentos construídos em alvenaria estrutural têm sido objeto de estudo de diversas pesquisas. Porém, não se fez até então um estudo das possíveis causas destas manifestações do ponto de vista multicausal, envolvendo as várias etapas do processo construtivo. Neste sentido, a presente pesquisa teve como objetivo principal analisar as relações de causa e efeito entre as fissuras dos empreendimentos construídos em alvenaria estrutural e as suas causas, utilizando-se de ferramentas de melhorias da qualidade que adotam uma visão multi-casual, muito utilizadas em outras indústrias Para este estudo foram utilizados relatórios de monitoramento de execução de empreendimentos que pertencem aos modos de provisão habitacional do Programa de Arrendamento Residencial (PAR) e Imóvel na Planta (IP), no Estado do Rio Grande do Sul, ambos gerenciados pela Caixa Econômica Federal. A pesquisa consistiu em: (a) revisão bibliográfica; (b) levantamento e análise dos dados provenientes dos relatórios, identificando falhas, recomendações técnicas e boas práticas adotadas pelas empresas construtoras; (c) aplicação de um método de análise de relações de causa e efeito composto por ferramentas da qualidade; e (d) geração de mapas de relações de causa e efeito, recomendações para tratamento das principais causas e listagem de algumas boas práticas construtivas. Através desta pesquisa foi possível verificar as principais falhas ao longo do processo construtivo em vários níveis de análise e analisar as relações de causa e efeito entre eles e propor uma priorização de melhorias da qualidade. Com base nesta priorização foi sistematizado um conjunto de recomendações técnicas e de boas práticas que podem ser disseminadas entre as empresas construtoras tendo em vista a melhoria da qualidade dos empreendimentos em estudo. / Structural masonry has had a substantial development in Brazil in the last few decades, becoming increasingly important, especially in social interest housing projects. In the specific case of Rio Grande do Sul, in the last two years, most low cost housing projects have been built using this construction process. Due to the demand of the funding organizations, the construction companies that build those projects must have a certified quality management system. However, despite this certification, a large number of building pathologies have been observed in those projects, especially cracks. In fact, the causes of building pathologies in structural masonry buildings have been the focus of several research studies. However, very little has been investigated on the causes of those pathologies from a multi-causal perspective, considering several stages of the construction process. The main objective of this research work is to analyze the cause-effect relationships between cracks in structural masonry buildings and their causes, using quality improvement tools that provide such multi-causal perspective, widely used in other industries. This study was based on quality monitoring reports of projects from two housing programs, the Residential Leasing Program (PAR) and the Blue-print Program (IP), in the State of Rio Grande do Sul. Both programs are managed by the National Savings Bank. The research study consisted of: (a) a literature review; (b) data collection and analysis using those reports, with the aim of identifying building failures, necessary improvements, and good practices adopted by construction companies; (c) application of a method for analyzing the cause-effect relationships which combined a set of quality tools; (d) development of cause-effect relationship maps, proposition of a set of improvements and a production of a list of good practices. Based on this study, it was possible to identify failures in the construction process, as well as to analyze the cause-effect relationships and propose some priorities in terms of improvements measures. Based on those priorities, a set of technical recommendations was established, as well as a list of good practices that should be disseminated among construction companies, in order to improve the quality of low-cost housing projects.

This study examines the potential to conduct building thermal performance simulation (BPS) of unconditioned low-cost housing during the early design stages. By creating a set of regression models (meta-models) based on EnergyPlus simulations, this research aims to promote and simplify BPS in the building envelope design process. The meta-models can be used as tools adapted for three Brazilian cities: Curitiba, São Paulo and Manaus, providing decision support to designers by enabling rapid feedback that links early design decisions to the buildings thermal performance. The low-cost housing unit studied is a detached onestory house with an area of approximately 51m2, which includes two bedrooms, a combined kitchen and living room, and one bathroom. This representative configuration is based on collected data about the most common residence options in some Brazilian cities. This naturally ventilated residence is simulated in the Airflow Network module in EnergyPlus, which utilizes the average wind pressure coefficients provided by the software. The parametric simulations vary the house orientation, U-value, heat capacity and absorptance of external walls and the roof, the heat capacity of internal walls, the window-to-wall ratio, type of window (slider or casement), and the existence of horizontal and/or vertical shading devices with varying dimensions. The models predict the resulting total degree-hours of discomfort in a year due to heat and cold, based on comfort limits defined by the adaptive method for naturally ventilated residences according to ANSI ASHRAE Standard 55. The methodology consists of (a) analyzing a set of Brazilian low-cost housing projects and defining a geometric model that can represent it; (b) determining a list of design parameters relevant to thermal comfort and defining value ranges to be considered; (c) defining the input data for the 10.000 parametric simulations used to create and test the meta-models for each analyzed climate; (d) simulating thermal performance using Energy Plus; (e) using 60% of the simulated cases to develop the regression models; and (f) using the remaining 40% data to validate the meta-models. Except by Heat discomfort regression models for the cities of Curitiba and São Paulo the meta-models show R2 values superior to 0.9 indicating accurate predictions when compared to the discomfort predicted with the output data from EnergyPlus, the original simulation software. Meta-models application tests are performed and the meta-models show great potential to guide designers decisions during the early design. / Esta pesquisa avalia as potencialidades do uso de simulações do desempenho térmico (SDT) nas etapas iniciais de projetos de habitações de interesse social (HIS) não condicionadas artificialmente. Busca-se promover e simplificar o uso de SDT no processo de projeto da envolvente de edificações através da criação de modelos de regressão baseados em simulações robustas através do software EnergyPlus. Os meta-modelos são adaptados ao clima de três cidades brasileiras: Curitiba, São Paulo e Manaus, e permitem uma rápida verificação do desconforto térmico nas edificações podendo ser usados como ferramentas de suporte às decisões de projeto nas etapas iniciais. A HIS considerada corresponde a uma unidade térrea com aproximadamente 51m2, composta por dois quartos, um banheiro e cozinha integrada à sala de jantar. Esta configuração é baseada em um conjunto de projetos representativos coletados em algumas cidades brasileiras (como São Paulo, Curitiba e Manaus). Estas habitações naturalmente ventiladas são simuladas pelo módulo Airflow Network utilizando o coeficiente médio de pressão fornecido pelo EnergyPlus. As simulações consideram a parametrização da orientação da edificação, transmitância térmica (U), capacidade térmica (Ct) e absortância () das paredes externas e cobertura; Ct e U das paredes internas; relação entre área de janela e área da parede; tipo da janela (basculante ou de correr); existência e dimensão de dispositivos verticais e horizontais de sombreamento. Os meta-modelos desenvolvidos fornecem a predição anual dos graus-hora de desconforto por frio e calor, calculados com base nos limites de conforto definidos pelo método adaptativo para residências naturalmente ventiladas (ANSI ASHRAE, 2013). A metodologia aplicada consiste em: (a) análise de um grupo de projetos de HIS brasileiras e definição de um modelo geométrico que os represente; (b) definição dos parâmetros relevantes ao conforto térmico, assim como seus intervalos de variação; (c) definição dos dados de entrada para as 10.000 simulações paramétricas utilizadas na criação e teste de confiabilidade dos meta-modelos para cada clima analisado; (d) simulação do desempenho térmico por meio do software EnergyPlus; (e) utilização de 60% dos casos simulados para o desenvolvimento dos modelos de regressão; e (f) uso dos 40% dos dados restantes para testar a confiabilidade do modelo. Exceto pelos modelos para predição do desconforto por calor para Curitiba e São Paulo, os demais meta-modelos apresentaram valores de R2 superiores a 0.9, indicando boa adequação das predições de desconforto dos modelos gerados ao desconforto calculado com base no resultado das simulações no EnergyPlus. Um teste de aplicação dos meta-modelos foi realizado, demonstrando seu grande potencial para guiar os projetistas nas decisões tomadas durante as etapas inicias de projeto.