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| Author(s): |
Rodrigo de Carvalho Soares
Total Authors: 1
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| Document type: | Doctoral Thesis |
| Press: | São Carlos. |
| Institution: | Universidade de São Paulo (USP). Escola de Engenharia de São Carlos (EESC/SBD) |
| Defense date: | 2001-04-02 |
| Examining board members: |
Wilson Sergio Venturini;
Ana Lúcia Homce de Cresce El Debs;
Alaa Mohamed;
Paulo de Mattos Pimenta;
Gilberto Francisco Martha de Souza
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| Advisor: | Wilson Sergio Venturini |
| Abstract | |
Using partial coefficients to reduce or to increase structure design parameter values, as proposed by the Brazilian and by other international codes, in general, does not lead to uniform reliability indices and consequently does not guarantee desired failure probability of the structures. The lack of structural variable knowledge may lead to not optmized designs in terms of either minimum cost or ideal shape. Moreover, it mainly can lead to structures for which the safety level is completely unknown. Introducing safety in structural designs by using probabilistic methods leads to more accurate procedure in terms of knowing the failure probabilities, which is the main objective of the present work. Initially, the statistic concepts, necessary to develop a mechanic-probabilistic study in the general sense, are introduced and discussed. Then, they are particularized to plane reinforced concrete frames. Some possible procedures are adopted to develop mechanical-probabilistic algorithms dedicated to this specific probabilistic analysis. Sensibility analysis of the design variables is another subject discussed in this work, with emphasis on the procedures used to develop the corresponding software. In addition, the work briefly describes the optimization and mechanical-reliability problem coupling, as well as non-linear mechanical models of this particular reinforced concrete structure now seen under a statistical view. A new model to accept the two first statistical moments of concrete strength is suggested on the basis of a parametric analysis. As another consequence of this analysis, a simplified model to compute stiffness reduction of concrete bar element is also suggested. (AU) | |