Título: | RELIABILITY BASED OPTIMIZATION: APPLICATION TO SPACE TRUSSES | |||||||
Autor: |
ANDERSON PEREIRA |
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Colaborador(es): |
LUIZ FERNANDO CAMPOS RAMOS MARTHA - Orientador LUIZ ELOY VAZ - Coorientador |
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Catalogação: | 25/SET/2007 | Língua(s): | PORTUGUESE - BRAZIL |
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Tipo: | TEXT | Subtipo: | THESIS | |||||
Notas: |
[pt] Todos os dados constantes dos documentos são de inteira responsabilidade de seus autores. Os dados utilizados nas descrições dos documentos estão em conformidade com os sistemas da administração da PUC-Rio. [en] All data contained in the documents are the sole responsibility of the authors. The data used in the descriptions of the documents are in conformity with the systems of the administration of PUC-Rio. |
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Referência(s): |
[pt] https://www.maxwell.vrac.puc-rio.br/projetosEspeciais/ETDs/consultas/conteudo.php?strSecao=resultado&nrSeq=10641&idi=1 [en] https://www.maxwell.vrac.puc-rio.br/projetosEspeciais/ETDs/consultas/conteudo.php?strSecao=resultado&nrSeq=10641&idi=2 |
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DOI: | https://doi.org/10.17771/PUCRio.acad.10641 | |||||||
Resumo: | ||||||||
Uncertainties associated with random variables, such as,
the material
proprieties and loads, are inherent to the design of
structures. These uncertainties are traditionally taken
into account in the project before the design
by defining design values for the random variables. The
design values of the
random variables are obtained from statistical properties
of the random variables and from partial safety factors.
Once these values are defined the variables
are treated as deterministic variables in the design
process. This approach has
been followed in the conventional design optimization and
in many design codes such as the Brazilian code for the
design of steel and concrete structures.
This simple approach, however, does not allow an estimate
of the structural
reliability of the resulting project which may have a low
(unsafe structure)
or a very high (expensive structure) reliability. To
overcome this problem a
reliability analysis must be incorporated into the
traditional design optimization. Design optimization,
incorporating reliability analyses, has been denoted
Reliability-Based Design Optimization (RBDO). In RBDO, the
constraints are
defined in terms of the probabilities of failure
associated with some prescribed
failure functions and therefore, it requires, as in the
reliability analysis, the
definition of the random variables and information about
their statistical properties. In this work, RBDO is
applied to the shape and sizing optimization of
spatial trusses considering geometric nonlinearities. The
constraints considered
in the RBDO problem are related to the following failure
mechanisms: to the
global collapse (limit load), to local buckling and yield
stress and to serviceability conditions (displacement
bounds). The algorithms used for solving the
optimization problem and for performing the reliability
analysis are described.
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