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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
91

Os impasses entre a judicialização da saúde e o processo orçamentário sob a responsabilidade fiscal: uma análise dos fundamentos decisórios do Supremo Tribunal Federal / The impasses between judicialization of healthy and budgetary process under fiscal responsibility: an analysis on decision fundaments of Ultimate Federal Tribunal

Mazza, Fabio Ferreira 09 May 2013 (has links)
Introdução - O Direito à saúde garantido constitucionalmente muitas vezes só pode ser efetivado por meio da intervenção do Poder Judiciário. No entanto, esta intervenção também chamada de judicialização, acaba por causar consequências no campo das finanças públicas quando não observadas as regras e o planejamento orçamentário. Objetivo - O presente trabalho tem por objetivo questionar o posicionamento do Supremo Tribunal Federal (STF) nos anos de 2000 a 2011, ao analisar os acórdãos que se referem ao direito à saúde. Busca-se responder a seguinte questão: Passados mais de vinte anos desde a promulgação da Constituição Federal de 1988 (que institucionalizou as regras orçamentárias em nosso país), e mais de dez anos de vigência da Lei de Responsabilidade Fiscal (Lei nº 101/2000 que trata da responsabilidade na gestão fiscal), em que medida as decisões judiciais junto às prestações de serviços de saúde observam as leis orçamentárias podendo, eventualmente, comprometer o orçamento em saúde e prejudicar a concretização da política de saúde universal planejada? Métodos - O trabalho foi realizado mediante pesquisa bibliográfica e documental, bem como por meio do levantamento e análise de acórdãos do STF, nos anos de 2000 a 2011. A escolha do ano de 2011 se deu pelo fato de já se ter passado mais de vinte anos desde a promulgação do texto Constitucional de 1988, e mais de 10 anos de vigência da Lei de Responsabilidade Fiscal. O levantamento dos acórdãos ocorreu por meio de pesquisa jurisprudencial, no sítio eletrônico do STF, com a utilização de jogos de combinação de palavras chave, quais sejam: saúde e responsabilidade e 196; direito e saúde e orçamento e responsabilidade; orçamento e saúde e 196; 196 e orçamento; 196 e saúde; medicamento e orçamento e 196; medicamento e saúde; direito e saúde e medicamento e orçamento; direito e saúde e judicialização; judicialização e medicamento; judicialização e 196; judicialização e orçamento; direito e medicamento; orçamento e saúde; medicamento e orçamento; medicamento e 196, medicamento e fornecimento, afim de se obter o maior espectro possível de resultados, tendo como base para a pesquisa o item pesquisa de acórdãos. A pesquisa documental e bibliográfica teve como base a literatura referente ao direito fundamental social à saúde, no marco do Estado Democrático de Direito, bem como o fenômeno da judicialização da saúde e da institucionalização das finanças públicas no País, a partir da Constituição de 1988. Resultados - O STF geralmente não leva em consideração as regras e o planejamento orçamentário quando de suas decisões no campo da saúde. Conclusões - É necessário haver um equilíbrio e proporcionalidade nas decisões do Poder Judiciário que envolvam o direito à saúde, pois a saúde e o orçamento convivem lado a lado. / Introduction - The right to healthy, constitutionally guaranteed, often can only be reached by intervention of Judiciary. However, this intervention, also called judicialization, turns out to cause consequences on the field of public finance when the rules and the budgetary planning are not observed. Objective - The present work aims to question the position of Ultimate Federal Tribunal (STF) in 2000 to 2011, as for analyzing judgments refer to the right to healthy. It aims to answer the following question: After more than 20 years after promulgation of Federal Constitution of 1988 (which institutionalized the budgetary rules in your Country), and more than 10 years of duration of Law of Fiscal Responsibility (Law nº 101/2000, that treats of responsibility in fiscal management), to what extend judicial decisions along with provision of health services observe the budgetary laws , being allowed to, eventually, compromise the budgetary plan on healthy and harm the accomplishment of the policy planned universal healthy? Methods - The work was performed via documental and bibliographical research, as well via survey and analizes of STF´s judgments, in the years of 2000 to 2011. The choice of the year 2011 was given by the fact it´s been past 20 years after from the promulgation of the Constitutional text of 1988, and more that 10 years of duration of Law of Fiscal Responsibility. The survey of judgments occurred by means of a jurisprudential research, on STF´s page, using the matching keyword, which are: healthy and responsibility and 196; right and healthy and budget and responsibility; budget and healthy and 196; 196 and budget; 196 and healthy; medicine and budget and 196; medicine and healthy; right and healthy and medicine and budget; right and healthy and judicialization; judicialization and medicine; juducialization and 196; juducialization and budget; right and medicine; budget and healthy; medicine and budget; medicine and 196; medicine and provision, in order to obtain the biggest possible spectrum of results, taking as basis for the research the item research of judgments. The bibliographic and documental research was based on the literature regarding the social-fundamental right to healthy, mark of Democratic State of Right, as well the phenomenon of judicialization of healthy and the institutionalization of Brazilian public finance, from the Constitution of 1988. Results - STF generally doesn´t take into account the rules and the budgetary planning when deciding on healthy field. Conclusions - It´s necessary to have an equilibrium and proportionality in the decisions of Judiciary involving the right to healthy, because the healthy and the budget live together.
92

Os impasses entre a judicialização da saúde e o processo orçamentário sob a responsabilidade fiscal: uma análise dos fundamentos decisórios do Supremo Tribunal Federal / The impasses between judicialization of healthy and budgetary process under fiscal responsibility: an analysis on decision fundaments of Ultimate Federal Tribunal

Fabio Ferreira Mazza 09 May 2013 (has links)
Introdução - O Direito à saúde garantido constitucionalmente muitas vezes só pode ser efetivado por meio da intervenção do Poder Judiciário. No entanto, esta intervenção também chamada de judicialização, acaba por causar consequências no campo das finanças públicas quando não observadas as regras e o planejamento orçamentário. Objetivo - O presente trabalho tem por objetivo questionar o posicionamento do Supremo Tribunal Federal (STF) nos anos de 2000 a 2011, ao analisar os acórdãos que se referem ao direito à saúde. Busca-se responder a seguinte questão: Passados mais de vinte anos desde a promulgação da Constituição Federal de 1988 (que institucionalizou as regras orçamentárias em nosso país), e mais de dez anos de vigência da Lei de Responsabilidade Fiscal (Lei nº 101/2000 que trata da responsabilidade na gestão fiscal), em que medida as decisões judiciais junto às prestações de serviços de saúde observam as leis orçamentárias podendo, eventualmente, comprometer o orçamento em saúde e prejudicar a concretização da política de saúde universal planejada? Métodos - O trabalho foi realizado mediante pesquisa bibliográfica e documental, bem como por meio do levantamento e análise de acórdãos do STF, nos anos de 2000 a 2011. A escolha do ano de 2011 se deu pelo fato de já se ter passado mais de vinte anos desde a promulgação do texto Constitucional de 1988, e mais de 10 anos de vigência da Lei de Responsabilidade Fiscal. O levantamento dos acórdãos ocorreu por meio de pesquisa jurisprudencial, no sítio eletrônico do STF, com a utilização de jogos de combinação de palavras chave, quais sejam: saúde e responsabilidade e 196; direito e saúde e orçamento e responsabilidade; orçamento e saúde e 196; 196 e orçamento; 196 e saúde; medicamento e orçamento e 196; medicamento e saúde; direito e saúde e medicamento e orçamento; direito e saúde e judicialização; judicialização e medicamento; judicialização e 196; judicialização e orçamento; direito e medicamento; orçamento e saúde; medicamento e orçamento; medicamento e 196, medicamento e fornecimento, afim de se obter o maior espectro possível de resultados, tendo como base para a pesquisa o item pesquisa de acórdãos. A pesquisa documental e bibliográfica teve como base a literatura referente ao direito fundamental social à saúde, no marco do Estado Democrático de Direito, bem como o fenômeno da judicialização da saúde e da institucionalização das finanças públicas no País, a partir da Constituição de 1988. Resultados - O STF geralmente não leva em consideração as regras e o planejamento orçamentário quando de suas decisões no campo da saúde. Conclusões - É necessário haver um equilíbrio e proporcionalidade nas decisões do Poder Judiciário que envolvam o direito à saúde, pois a saúde e o orçamento convivem lado a lado. / Introduction - The right to healthy, constitutionally guaranteed, often can only be reached by intervention of Judiciary. However, this intervention, also called judicialization, turns out to cause consequences on the field of public finance when the rules and the budgetary planning are not observed. Objective - The present work aims to question the position of Ultimate Federal Tribunal (STF) in 2000 to 2011, as for analyzing judgments refer to the right to healthy. It aims to answer the following question: After more than 20 years after promulgation of Federal Constitution of 1988 (which institutionalized the budgetary rules in your Country), and more than 10 years of duration of Law of Fiscal Responsibility (Law nº 101/2000, that treats of responsibility in fiscal management), to what extend judicial decisions along with provision of health services observe the budgetary laws , being allowed to, eventually, compromise the budgetary plan on healthy and harm the accomplishment of the policy planned universal healthy? Methods - The work was performed via documental and bibliographical research, as well via survey and analizes of STF´s judgments, in the years of 2000 to 2011. The choice of the year 2011 was given by the fact it´s been past 20 years after from the promulgation of the Constitutional text of 1988, and more that 10 years of duration of Law of Fiscal Responsibility. The survey of judgments occurred by means of a jurisprudential research, on STF´s page, using the matching keyword, which are: healthy and responsibility and 196; right and healthy and budget and responsibility; budget and healthy and 196; 196 and budget; 196 and healthy; medicine and budget and 196; medicine and healthy; right and healthy and medicine and budget; right and healthy and judicialization; judicialization and medicine; juducialization and 196; juducialization and budget; right and medicine; budget and healthy; medicine and budget; medicine and 196; medicine and provision, in order to obtain the biggest possible spectrum of results, taking as basis for the research the item research of judgments. The bibliographic and documental research was based on the literature regarding the social-fundamental right to healthy, mark of Democratic State of Right, as well the phenomenon of judicialization of healthy and the institutionalization of Brazilian public finance, from the Constitution of 1988. Results - STF generally doesn´t take into account the rules and the budgetary planning when deciding on healthy field. Conclusions - It´s necessary to have an equilibrium and proportionality in the decisions of Judiciary involving the right to healthy, because the healthy and the budget live together.
93

[en] EVALUATION OF THE BEARING CAPACITY OF PILES BY THEORETICAL AND EMPIRICAL APPROACHES / [pt] ESTIMATIVA DA CAPACIDADE DE CARGA DE ESTACAS POR MÉTODOS SEMI-EMPÍRICOS E TEÓRICOS

LUCIANA BARROS DE MIRANDA AVIZ 18 September 2006 (has links)
[pt] A fundação em estaxa é uma das alternativas mais antigas de suporte de estruturas,mas seu projeto ainda é um desfio para engenharia geotécnica, sendo muito em pricípios empíricos. As estacas são elementos esbeltos de grande comprimento relativo, gerlamente utilizadas quando os solos que compõem as camadas mais superficiais do terreno não são suficientemente resistentes para suportar as cargas da superestrutura. A capacidade de suporte de estacas pode ser estimada através de métodos teóricos, semi-empíricos. Para aplicação de um método teórico é necessário o conhecimento mais detalhado da geometria do problema, das propriedades tensão x defromação x resistência dos solos, das características da interface solo-estaca,etc., enquanto que para os métodos semiempíricos a aplicação é geralmenta feita com base em resultados de ensaios de campo. As formulaçõessemi-empíricas são as mais usuais na prática da engenharia para o cálculo da capacidade de suporte de estacas visto que os métodos teóricos, à exceção de grandes projetos, têm sua aplicação ainda restrita. Na prática brasileira,os projetos de fundações são elaborados frequentemente com base em resultados de ensaio SPT, sendo os dois métodos mais utilizados para a obtenção da capacidade de carga de estacas os métodos propostos por Aoki e Velloso (1975) e Décourt e Quaresma (1978, 1982). O objetivo deste trabalho consiste em comparar algumas das metodologias correntemente utilizadas na previsão da capacidade de suporte de estacas sob carregamento axial com as previsões obtidas em análises teóricaspelo método dos elementos finitos, através da utilização do programa Plaxis v. 8. / [en] Pile is one of the oldest alternatives of support of structures but its designis still considered a challenge for the ground engineering,being based on empirical principles. Piles are slender elements of great relative length, generally used when soils that compose the most superficial layers of the soil profile are not sufficiently resistant to support the loads from superstructure. The bearing capacity of piles can be estimated by empirical and theoretical approaches. For application of a theoretical approach a more detailed knowledge is necessary about the geometry of the problem, the tension x deformation x resistence soil satate, interface soil-pile characteristics and others, while for empirica approaches the application is generally done on the basis of field test results. The empirical formulations are the most usual in the practice of the engineering for the calculation of the bearing capacity of piles since theoretical approaches have iots application restricted. In brazilian engineering practice, the projects of foundations are elaborated frequently on the basis of SPT test results, being the two approachesd more utilized proposed by Aoki and Velloso (1975) and Décourt and Quaresma (1978, 1982). The objective of this work is compare some of the methodologies currently utilized to obtain the bearing capacity of the piles under axial loading with the results obtained in theoretical analysis by finite element approach, using Plaxis verion 8.0 software.
94

Rationality in inquiry : on the revisability of cognitive standards

Nilsson, Jonas January 2000 (has links)
The topic of this study is to what extent standards of rational inquiry can be rationally criticized and revised. It is argued that it is rational to treat all such standards as open to criticism and revision. Arguments to the effect that we are fallible with regard to all standards of rational inquiry are presented. Standards cannot be ultimately justified and with certainty established either as adequate or as inescapable presuppositions. Apel's attempt to give ultimate justifications of certain moral and logical rules is examined and criticized. Special attention is given to our fallibility with regard to logical inference rules. The idea that certain logical rules cannot be put into question because any critical argument presupposes them is criticized. It has been claimed that there must be some basic standards which are such that they cannot be rationally evaluated and hence are rationally unrevisable. This is called "the unrevisability thesis". Related to this thesis is the normative policy according to which rationality requires that some standards be treated as unrevisable, the unrevisability policy. Two arguments that have been used to defend the unrevisability thesis and policy are examined and criticized. The conclusion is that we are not forced to accept either the thesis or the policy. The negation of the unrevisability policy is the revisability policy, according to which it is rational to treat all standards as open to rational criticism and revision. Objections that have been directed against the revisability policy are discussed and criticized. According to the objections, the revisability policy leads to rationality relativism. These objections are refuted, and it is argued that it is, on the contrary, rational to adopt the revisability policy and treat all standards of rational inquiry as criticizable and revisable. It is proposed that the rational change of standards should be viewed as a bootstrap process. General features of a bootstrap view of rational change of standards are presented, and it is argued that it is impossible to formulate a real theory of bootstrapping. Two models of standard change are presented and discussed: Laudan's reticulated model of scientific rationality and Briskman's bootstrap theory. It is claimed that in spite of defects and limitations, these models contribute to a richer understanding of bootstrapping. The fallibility and revisability of standards of rational inquiry have consequences for how the normativity of rationality should be understood. The book ends with an account of how the rationality of cognitive actions is related to the idea of the adequacy of standards. A distinction between absolute and standard-relative rationality is made, and it is argued that what an inquiring agent rationally ought to do coincides with what it is standard-relatively rational for him to do. It is shown that this view of rationality of inquiry is nevertheless inconsistent with rationality relativism, and that it is compatible with an objectivistic view of rationality. / digitalisering@umu
95

Evolution of IR Absorber for Integration in an IR Sensitive CO2 Detector

Ashraf, Shakeel January 2011 (has links)
The maximum sensitivity of a thermal IR sensor can be available either by means of the sensor material, having its own absorbing properties, or by the deposition of an additional absorber structure on the detector surface. In this thesis, the theory of two absorption structures is discussed. The first is called the interferometric absorber structure. The second structure under investigation uses a lead selenide layer for the IR absorption. In the interferometric structure, a new epoxy material SU8-2002 was used as a dielectric medium. This material has a very low thermal conductivity of 0.3 W/mK, which makes it suitable for thermal detectors. The interferometric structure is based on three layers, a 40–60 Å thick Ti layer, a SU8–2002 layer with a thickness of 2000 Å thick and a 2000Å Al layer. Using standard cleanroom processing an interferometric structure was fabricated. Transfer matrix theory was used in order to simulate the interferometric structure and the lead selenide was fabricated by means of an argon-plasma sputtering process. Both fabricated samples were characterized through Fourier transfer infrared (FTIR) spectroscopy together with a specular reflectance accessory. The thicknesses of the added layers were measured using Atomic force microscopy (AFM) for both the interferometric and lead selenide structure.  It was determined  that by changing the reflective index value of the SU8-2002 from the reported value of 1.575 to about 2.40 that this provided a better agreement with the experimental results. The absorption results for the interferometric structure were determined to be approximately 82–98% for the wavelength region of 2-20µm at 30 degree. The PbSe absorption spectra showed 30%–50% absorption for the wavelength region 2.5 – 6.67μm.
96

Characterization of Forest Harvest Residue from the Great Lakes-St Lawrence Forests of South-eastern Ontario

Acquah, Gifty Ewurama 14 December 2010 (has links)
The use of fossil derived products and the environmental and economic problems associated with them have made a shift to abundant renewable resources such as forest biomass more attractive. However before forest biomass can be used as a resource, its properties must be known. This study determined the physical properties of heterogeneous biomass residues produced during harvesting on two operational forest sites within the Great Lakes-St Lawrence forest of south-eastern Ontario. Properties measured were moisture content, size distribution, bulk density, and wood-to-bark ratio; also thermo-chemical properties including elemental composition, thermal reactivity and energy content were measured. The effects of forest site and harvest type, storage and position in storage pile, on the properties of biomass were also investigated. Results of the study showed that the various heterogeneous forest harvest residues differed more physically than thermo-chemically for the different variables, and this affected biomass procurement more than the potential utilization options.
97

[en] OPTIMUM DESIGN OF CABLES IN PRESTRESSED CONCRETE STRUCTURES CONSIDERING THE ULTIMATE LIMIT STATE OF BENDING / [pt] OTIMIZAÇÃO DO TRAÇADO DE CABO EM VIGAS DE CONCRETO PROTENDIDO CONSIDERANDO O ESTADO LIMITE ÚLTIMO DE FLEXÃO

MELISSA SENHORINHO VENTURA E ESTEVES 19 August 2002 (has links)
[pt] A busca por uma estrutura ótima, que consuma o mínimo de material possível, e atenda, ao mesmo tempo, aos critérios de segurança e bom comportamento em serviço e aos aspectos construtivos, deve ser preocupação primordial de todo engenheiro de projeto. Daí a grande importância da área da engenharia que trata de otimização de estruturas, que visa estudar ferramentas que auxiliem o engenheiro na obtenção do projeto ótimo.Este trabalho tem como objetivo apresentar uma metodologia para a determinação do traçado ótimo de cabos aderentes de protensão, considerando- se condições do estado limite último de flexão, além daquelas usuais referentes aos estados limites de utilização.A solução de problema é obtida via técnicas de otimização, trabalhando com o algoritmo de Han-Powell, de programação não-linear.As variáveis de projeto são a força de protensão, os coeficientes das parábolas que descrevem o cabo protendido e os parâmetros da configuração deformada em cada seção de estudo da viga.O problema de otimização estrutural proposto é minimizar a força de protensão em vigas isostáticas e hiperestáticas, submetido a restrições geométricas, limitações das tensões nos bordos extremos da viga no estado limite de utilização, e verificação do estado limite último em seções previamente definidas.O desenvolvimento de um programa de computador permitiu a implementação deste problema e a geração, como resultado, do traçado ótimo de um cabo médio, e da força de protensão mínima, após as perdas imediatas, consideradas constantes ao longo do comprimento da viga. / [en] The search for the optimum design, with the minimum possible material consumption and satisfying, at the same time, safety and in service conditions and also the constructive aspects, must be a central preoccupation of all engineers.Therefore the optimization of structures is such an important engineering area, which studies tools for helping the engineering to obtain the optimum design. The objective of this work is to present on methodology for the determination of the optimum design of prestressed cable, considering both the ultimate limit state and the in service limit state.The solution of the problem is obtained through optimization techniques, normally,the Han-Powell algorithm is applied for solving the non-linear programming problem.The design variables are the prestressed force and the parameters, which define the geometry of the cable and the deformation of the beam in given sections.The proposed optimization problem is to minimize the prestressed force in beams while constraining the geometry of the cable and the stresses during in service loads and satisfying safety in the ultimate limit state in prescribed sections. A computer program, based on the formulation, was developed which allowed the user to obtain the optimum design of the cable and the correspondent minimum prestressed force, after immediate losses which are considered constant along the beam length.
98

O SENTIDO DO MISTÉRIO NA TEOLOGIA SISTEMÁTICA DE PAUL TILLICH / The sense of mystery in the sistematic theology of Paul Tilich

Silva, Sandro Graciliano Souza 14 March 2012 (has links)
Made available in DSpace on 2016-08-03T12:19:11Z (GMT). No. of bitstreams: 1 SGraciliano.pdf: 526446 bytes, checksum: bdfa6d3abf96f944133713a54ee1e5e5 (MD5) Previous issue date: 2012-03-14 / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior / This research intends to demonstrate the mystery on Paul Tillich s Systematic Theology. It certifies that the mystery is the manifestation of the sacred for the human being knowledge. Nevertheless, this research concludes that the human being unites to the divine from the knowledge of the revelation of the mystery. Tillich says that the existential knowledge is based on an encounter in which a new meaning is created and recognized. The revelation of the mystery is an existential knowledge and its manifestation in the human bearer of revelation comes to know another person, he knows his history and participates in the reality in which the mystery is revealed in its totality. The mystery is the manifestation of the sacred, for that its revelation causes profound changes in the human being. In Tillich s Systematic Theology the mystery is described as a mark of revelation, its first mark. However as we approach to the text we see that the mystery is more than a mark to Tillich, the mystery is the manifestation of the ground of being, the mystery is the manifestation of the divine that communicates symbolically to the human being from the final revelation of Jesus as the Christ. / Esta pesquisa propõe-se a tematizar o mistério na Teologia Sistemática de Paul Tillich. Ela constata que o mistério é a manifestação do sagrado para o conhecimento do ser humano. Portanto, essa pesquisa conclui que o ser humano une - se ao divino a partir do conhecimento da revelação do mistério. Tillich afirma que o conhecimento existencial basea-se num encontro no qual uma nova significação é criada e reconhecida. A revelação do mistério é um conhecimento existencial e na sua manifestação o ser humano portador da revelação passa a conhecer outra pessoa, ele conhece a sua história e participa da realidade na qual o mistério se revelou na sua totalidade. O mistério é a manifestação do sagrado, por isso a sua revelação causa no ser humano profundas mudanças. Na teologia sistemática de Tillich o mistério é descrito como uma marca da revelação, a sua primeira marca. No entanto ao nos aproximarmos do texto percebemos que ele é mais que uma marca para Tillich, o mistério é a manifestação do fundamento do ser, o mistério é a manifestação do divino que se comunica simbolicamente ao ser humano a partir da revelação final de Jesus como o Cristo.
99

Exploring the Success and Defeat of Ronda Rousey: A Content Analysis of Twitter and Newspaper Coverage from 2014-2016

Mikelonis, Ashley, Mikelonis, Ashley January 2017 (has links)
Scholarly research has analyzed how female athletes use their social media platforms and how they are represented in news media coverage. However, no scholarly literature has specifically looked at Ronda Rousey, an American mixed martial artist. The current study used a quantitative content analysis to examine how Rousey has utilized her Twitter account as well as how local and national newspapers in the United States framed coverage of Rousey between 2014 to 2016. For the tweets, content, referring to pictures that Rousey posted, was the most popular category; the second most prevalent category was promotional, referring to tweets that promoted upcoming events or sponsorships. Rousey mainly used her Twitter to post pictures of herself and promote her personal brand. For the newspaper articles, the most frequently used frames were agency, powerless, and goals and ambitions. Two new frames emerged from the current study – fame, referring to Rousey’s film career, and relations, referring to Rousey’s personal life and relationships. The newspapers were predominantly neutral in their coverage of Rousey throughout the three-year study period. This case study is important because it found that Rousey was framed in a way that differed from previous research. The findings in this study demonstrate that Rousey was not marginalized in newspaper coverage or portrayed in a negative manner, as other female athletes have been in the past. Rather than focusing on her appearance or sexuality, the news coverage highlighted Rousey’s success and athletic achievements.
100

Behaviour of welded tubular structures in fire

Ozyurt, Emre January 2015 (has links)
This thesis presents the results of a research project to develop methods to carry out fire safety design of welded steel tubular trusses at elevated temperatures due to fire exposure. It deals with three subjects: resistance of welded tubular joints at elevated temperatures, effects of large truss deflection in fire on member design and effects of localised heating. The objectives of the project are achieved through numerical finite element modelling at elevated temperatures using the commercial Finite Element software ABAQUS v6.10-1 (2011). Validation of the simulation model for joints is based on comparison against the test results of Nguyen et al. (2010) and Kurobane et al. (1986). Validation of the simulation model for trusses is through checking against the test results of Edwards (2004) and Liu et al. (2010).For welded tubular joints, extensive numerical simulations have been conducted on T-, Y-, X-, N- and non-overlapped K-joints subjected to brace axial compression or tension, considering a wide range of geometrical parameters. Uniform temperature distribution was assumed for both the chord and brace members. Results of the numerical simulations indicate for gap K- and N-joints (two brace members, one in tension and the other in compression) and for T-, Y- and X-joints with the brace member under axial tensile load (one brace member only, in tension), it is suitable to use the same ambient temperature calculation equation as in the CIDECT (2010) or EN 1993-1-8 (CEN, 2005a) design guides and simply replace the ambient temperature strength of steel with the elevated temperature value. However, for T-, Y- and X-joints under brace compression load (one brace member only, in compression), the effect of large chord deformation should be considered. Large chord deformation changes the chord geometry and invalidates the assumed yield line mechanism at ambient temperature. For approximation, the results of this research indicate that it is acceptable to modify the ambient temperature joint strength by a reduction factor for the elastic modulus of steel at elevated temperatures. In the current fire safety design method for steel truss, a member based approach is used. In this approach, the truss member forces are calculated at ambient temperature based on linear elastic analysis. These forces are then used to calculate the truss member limiting temperatures. An extensive parametric study has been carried out to investigate whether this method is appropriate. The parametric study encompasses different design parameters over a wide range of values, including truss type, joint type, truss span-to-depth ratio, critical member slenderness, applied load ratio, number of brace members, initial imperfection and thermal elongation. The results of this research show that due to a truss undergoing large displacements at elevated temperatures, some truss members (compression brace members near the truss centre) experience large increases in member forces. Therefore, using the ambient temperature member force, as in the current truss fire safety design method, may overestimate the truss member critical temperature by 100 °C. A method has been proposed to analytically calculate the increase in brace compressive force due to large truss deformation. In this method, the maximum truss displacement is assumed to be span/30. A comparison of the results calculated using the proposed method against the truss parametric study results has shown good agreement with the two sets of results, with the calculation results generally being slightly on the safe side. When different members of a truss are heated to different temperatures due to localised fire exposure, the brace members in compression experience increased compression due to restrained thermal expansion. To calculate the critical temperature of a brace member in a localised heated truss, it is necessary to consider this effect of restrained thermal expansion. It is also necessary to consider the beneficial effects of the adjacent members being heated, which tends to reduce the increase in compressive force in the critical member under consideration. Again, an extensive set of parametric studies have been conducted, for different load ratio, slenderness and axial restraint ratio. The results of this parametric study suggest that to calculate the critical temperature of a brace member, it is not necessary to consider the effects of the third or further adjacent members being heated. For the remainder of the heated members, this thesis has proposed a linear elastic, static analysis method at ambient temperature to calculate the additional compressive force (some negative, indicating tension) in the critical member caused by the heated members (including the critical member itself and the adjacent members). The additional compressive force is then used to calculate the limiting temperature of the critical member. For this purpose, the approximate analytical equation of Wang et al. (2010) has been demonstrated to be suitable.

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