The full height truss frame (FHTF) is an exciting new residential framing system in response to the need for low floor-to-floor steel construction. The FHTF has the potential to provide low floor-to-floor heights, a column free first floor area, an integrated frame that uses the entire height to resist loads, and the capacity to resist both gravity and lateral loads. Because of its configuration, the full structural height can be used to resist loads. A FHTF is made up of stacked floor trusses that result in one full height truss spanning the entire width of the building. The FHTF is constructed in a conventional manner one floor at a time. The strength, inertia, and truss height will increase as each floor is added. Therefore, the construction sequence will affect the final stresses in the members. The purpose of this thesis was to analyze and design two prototype FHTFs, to compare the economy of the prototypes with similar staggered truss frames, and to develop an approximate method to calculate staged member stresses. Each prototype was analyzed using a computer program and designed according to the 2001 American Institute of Steel Construction Load and Resistance Factor Design. The prototypes were used to assess the strength and serviceability of the structures, and the results of the staged analysis were used to validate the numerical method developed to approximate a staged loading sequence based on the non-staged dead load results. The results of the analysis and design of the prototypes was the initial step in confirming the viability of the FHTF for use in the residential multistory market. FHTFs can be designed with preexisting procedure, and are capable of offering low floor-to-floor heights. The prototypes exhibited excellent lateral stiffness against wind loads. The numerical method for estimating the staged dead load accurately approximated the results of the analysis preformed by ETABS. The numerical method can be used to simulate a variety of sequences in order to optimize the stages. Lastly, the FHTF was shown to be competitive with the staggered truss systems in terms of material usage, fabrication, and construction.

In steel moment resisting frames, the region of the column located within the beam-column joint is known as the panel zone. When a steel moment resisting frame is subjected to lateral load, due to wind or seismic loads, the panel zone is subject to high shear. In some cases, the shear in the panel zone is sufficiently high that the panel zone must be reinforced to increase its stiffness and/or strength. This is normally accomplished by welding doubler plates to the column in the panel zone region. Doubler plates can be a costly feature in steel moment resisting frames because of the substantial amount of welding involved. There has been a large amount of past research that has investigated the required shear strength and stiffness of the panel zone region to establish a basis for sizing doubler plates. However, very little past research has investigated the details of attaching doubler plates to columns. These attachment details can have a significant influence on the structural performance of panel zone and on cost. The overall goal of this research was to conduct preliminary finite element studies that provide insight into several key issues related to the attachment of doubler plates to columns and to identify issues that require further research. The research involved finite element modeling of a simplified representation of beam-to-column joint subjected to monotonic loading. A total of twenty-one analysis cases with different doubler plate attachment details were studied. Issues that were investigated included the effect of welding different edges of the doubler plate to the column (horizontal edges only, vertical edges only, and all four sides), the effect of extending the doubler plate beyond the panel zone region, and the effect of providing two thinner doubler plates of equivalent total thickness on both sides of the column web instead of one thick doubler plate on one side of the column web. In addition, the forces developed in the doubler plate welds were computed from the finite element analysis and compared with current building code requirements for the design of these welds. Observations and preliminary design recommendations on these issues are provided in this thesis, along with recommendations for further research. / text

Aumento da produtividade, melhorias na qualidade dos produtos, redução de custos e de impactos ambientais são essenciais para a capacidade competitiva das empresas. A execução da fachada faz parte do caminho crítico da obra, por ser um subsistema que associa as funções de fechamento, acabamento, iluminação e ventilação e ainda por incorporar sistemas prediais; apresenta, por isso também, um alto custo direto em relação aos outros subsistemas do edifício. A tecnologia construtiva de fachadas em chapas delgadas com estrutura em Light Steel Framing (LSF) é uma alternativa viável para aumentar a produtividade e reduzir os prazos de obra, com qualidade e desempenho, e pode trazer benefícios em relação a atividades intensas em mão de obra como é o caso da alvenaria de vedação e de seus revestimentos. O presente trabalho tem por objetivo sistematizar e analisar o conhecimento relativo a essa tecnologia construtiva de fachada. O método adotado compreende revisão bibliográfica. Como contribuição, o trabalho reúne um conjunto organizado de informações sobre os principais sistemas disponíveis no mercado contemplando: a caracterização do sistema de fachada, de suas camadas e dos perfis leves de aço e a sistematização das principais avaliações técnicas de sistemas existentes em outros países, reunindo normas técnicas de produtos e de execução. Acredita-se que a reunião e organização das informações, antes dispersas em diversas referências, têm potencial para subsidiar o meio técnico para tomada de decisão quanto ao uso adequado da nova tecnologia. / Increase productivity, improve product quality and reducing costs and environmental impact are essential for a competitive business. One of the critical paths of construction projects is the execution of the façade, a subsystem that associates multiple functions as sealing, finishing, lighting and ventilation feature and may incorporate other building systems. As another characteristic of these properties, a façade possess an important direct cost in relation to other subsystems. The building technology of light steel external wall system is a viable alternative, as it holds a potential to increase productivity, reduce construction deadline and bring benefits in regards to the labor heavy nature of masonry and mortar cladding. This research aims to organize the knowledge on the building technology of light steel external wall facade. The research method comprises a technical literature review. As a result, this study combines an organized ensemble of information about characterization of the light steel external wall system, its layers and steel profile. The work also performs an analysis of technical evaluations of existing systems in other countries, gathering technical standards of products and assembling techniques. The information here presented may serve as reference to the technical community by compiling and organizing information available in various and dispersed references.

Made available in DSpace on 2016-06-02T20:09:13Z (GMT). No. of bitstreams: 1 3701.pdf: 4826071 bytes, checksum: f99af11a4c80ea08b67f201d33ce7f0a (MD5) Previous issue date: 2011-06-30 / Financiadora de Estudos e Projetos / This work has the aim to propose guidelines for the preparation of designs for production with the construction of single family houses of Light Steel Framing. These guidelines involve considerations about the presentation of designs and assembly sequences on the main elements of a building in Light Steel Framing, promoting higher constructability on projects. Parallel to these guidelines were developed some graphical detail, with respect to the elements discussed, based on the concept of Design for Assembly. For this, have been used the information from the literature review, which deals with concepts such as Concurrent Engineering, Lean Design and Design for Production, and information gathered in structured interviews. The product of this work contributes to the advancement of studies about the design process of Light Steel Framing, besides promoting the use of concepts just discussed or used in Construction. Being a prefabricated building system, Light Steel Framing collaborates with the modernization of the processes involved in small works and facilitates the use of management principles such as Lean Construction and tools such as Design for Assembly. / Este trabalho tem por objetivo principal a proposição de diretrizes para a elaboração de projetos para produção voltados para a construção de habitações unifamiliares de Light Steel Framing. Tais diretrizes envolvem considerações a respeito da apresentação dos projetos e sobre sequências de montagem dos principais elementos de uma edificação em Light Steel Framing, promovendo maior construtibilidade aos projetos. Paralelo a estas diretrizes, foram desenvolvidos alguns detalhes gráficos com relação aos elementos abordados baseados no conceito do Design for Assembly. Para isso, foram utilizadas as informações da revisão bibliográfica, que aborda conceitos como a Engenharia Simultânea, Lean Design e o próprio Projeto para Produção, e as informações coletadas nas entrevistas estruturadas. O produto desta dissertação contribui para o avanço dos estudos a respeito do processo de projeto do Light Steel Framing, além de promover o uso de conceitos pouco abordados ou utilizados na Construção Civil. Sendo um sistema construtivo pré-fabricado, o Light Steel Framing colabora com a modernização dos processos envolvidos em obras de pequeno porte e facilita o emprego de princípios de gestão como da Lean Construction e de ferramentas como o Design for Assembly.

Made available in DSpace on 2016-06-02T20:09:15Z (GMT). No. of bitstreams: 1 4297.pdf: 4397447 bytes, checksum: e5f98b94d72e389281cbc0c54b112024 (MD5) Previous issue date: 2012-03-08 / Financiadora de Estudos e Projetos / The construction industry in Brazil has great importance both socially and economically, but generates more than 50% of municipal solid waste and consuming large quantities of raw materials, energy and water. Thus the sector is strategic under the environmental point of view, since small changes in their processes cause the reduction of environmental impacts. To meet the current housing shortage, many building systems are being employed in the country, among which, the Light Steel Framing (LSF), which consists of a rational building system, and industrial productivity. The aim of this study was to simulate the amount of embodied energy original (EEi) of a standard project aimed at social housing using the LSF as a constructive system, applying the concepts of Life Cycle Analysis of Energy (ACVE). To achieve this goal initially was held to review the literature on sustainability, and LSF construction system ACVE. Following the adjustment was made for a project for social housing in structural masonry designed to LSF. From the specifications for materials and components, their respective values of the quantitative EEi and held the simulation of the quantity of EEi considering three scenarios: project conceived in structural masonry concrete block, masonry, structural ceramic blocks and LSF. Comparing the results of three simulations, it was concluded that the project designed masonry structural ceramic blocks showed the lowest absolute value of the EEi in relation to other systems simulated (117.6 GJ and 3.0 GJ / m² ), with the LSF presented an intermediate value (154.3 GJ and 3.9 GJ / m²), but very close to the masonry of ceramic blocks, while designed masonry concrete blocks had a higher value (262 , 0 GJ and 6.6 GJ / m²), largely due to the high value of IAS adopted for the concrete. It is noteworthy that these results should not be extrapolated as EE values were used for materials and components used in these construction systems referenced in the international literature, which indicates the need to build a national database about. / A indústria de construção civil no Brasil possui grande importância tanto social quanto econômica, porém é geradora de mais de 50% dos resíduos sólidos urbanos e consumidora de grande quantidade de matéria-prima, energia e água. Desta forma o setor é estratégico sob o ponto de vista ambiental uma vez que pequenas mudanças em seus processos ocasionam a redução dos impactos ambientais. Para suprir o déficit habitacional atual, vários sistemas construtivos estão sendo empregados no país, dentre os quais, o Light Steel Framing (LSF), que consiste em um sistema construtivo racional, industrializado e com melhor produtividade. O objetivo deste trabalho consistiu na simulação da quantidade de energia embutida inicial (EEi) de um projeto padrão voltado à habitação de interesse social utilizando o LSF como sistema construtivo, aplicando-se os conceitos de Análise de Ciclo de Vida Energético (ACVE). Para atingir este objetivo se realizou inicialmente a revisão bibliográfica sobre sustentabilidade, sistema construtivo LSF e ACVE. Na sequência fez-se a adaptação de um projeto para habitação de interesse social concebido em alvenaria estrutural para o LSF. A partir das especificações dos materiais e componentes, dos seus respectivos valores de EEi e dos quantitativos realizou-se a simulação da quantidade de EEi considerando 3 situações: projeto concebido em alvenaria estrutural de blocos de concreto, alvenaria estrutural de blocos cerâmicos e LSF. Comparando-se os resultados das três simulações realizadas, concluiu-se que o projeto concebido em alvenaria estrutural de blocos cerâmicos foi o que apresentou menor valor de EEi absoluto em relação aos demais sistemas simulados (117,6 GJ e 3,0 GJ/m²), tendo-se o LSF apresentado um valor intermediário (154,3 GJ e 3,9 GJ/m²), porém bem próximo ao da alvenaria de blocos cerâmicos, enquanto que o concebido em alvenaria de blocos de concreto apresentou maior valor (262,0 GJ e 6,6 GJ/m²), muito em função do elevado valor de EEi adotado para o concreto. Ressalta-se que tais resultados não devem ser extrapolados uma vez que foram utilizados valores de EE para os materiais e componentes aplicados nestes sistemas construtivos referenciados em literatura internacional, o que indica a necessidade de se construir uma base de dados nacional a respeito.