Título: | EVALUATION OF THE EFFECTS OF CONCENTRATED LOADS ON STEEL BEAMS THROUGH NEURAL NETWORK TECHNIQUES | ||||||||||||||||
Autor: |
ELAINE TOSCANO FONSECA |
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Colaborador(es): |
SEBASTIAO ARTHUR LOPES DE ANDRADE - Orientador MARLEY MARIA BERNARDES REBUZZI VELLASCO - Coorientador PEDRO COLMAR GONCALVES DA SILVA VELLASCO - Coorientador |
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Catalogação: | 19/FEV/2001 | 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=1259&idi=1 [en] https://www.maxwell.vrac.puc-rio.br/projetosEspeciais/ETDs/consultas/conteudo.php?strSecao=resultado&nrSeq=1259&idi=2 [es] https://www.maxwell.vrac.puc-rio.br/projetosEspeciais/ETDs/consultas/conteudo.php?strSecao=resultado&nrSeq=1259&idi=4 |
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DOI: | https://doi.org/10.17771/PUCRio.acad.1259 | ||||||||||||||||
Resumo: | |||||||||||||||||
Concentrated loads on steel beams are frequently found in
structural
engineering practice. In situations where the location of
the load is fixed, traverse
web stiffeners can be used to provide an adequate increased
resistance, but for
economic reasons should be avoided whenever possible. For
moving loads, the
knowledge of the unstiffened web resistance becomes
imperative.
Many theories were developed for a better understanding of
the problem,
however, a 20% error is still present in the current design
formulas. A more accurate
design formula for this structural problem is very
difficult to be obtained, due to the
influence of several interdependent parameters. On the
other hand, creating new
experimental results is very expensive and time consuming.
As an alternative,
numerical methods were used to generate new data but they
still present significant
differences.
The neural networks were inspired in brain structure, to
present human
characteristics such as: learning from experience; and
generalization of new data
from a current set of standards. These characteristics
demonstrate the possibility of
using the neural networks to investigate complex problems
which could not be solved
by conventional programs, such as the forecasting of the
ultimate strength of steel
beams subjected to concentrated loads.
The main objective of this work is to investigate the
structural behavior of
concentrated loads, by means of a parametrical analysis.
This analysis can surely
help to identify the influence of the several
interdependent parameters. Thus, the
possibility of using neural networks to generate new data
is investigated.
A literature survey of the problem is presented, as well as
a critical
evaluation of the experimental results to be used as the
training data set of the neural
networks. In order to evaluate or train the neural
networks, the use of finite element
simulations will be analyzed. These numerical simulations
will be performed using a
finite element method interface system which was developed
to integrate the
preprocessing, analysis and post-processing programs. The
use of numerical results
present in the literature is also analyzed and discussed.
In order to validate the neural networks model, the results
are compared
with existing design formulas enabling the parametrical
analysis to be executed. The
neural networks model can also be used as a new tool to
forecast the ultimate load of
steel beams subjected to concentrated loads.
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