Otimização de elementos pré- moldados de concreto: lajes alveolares e vigas com cabo reto
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2014-08-26
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Universidade Federal de Goiás
Resumo
This work presents the application of optimization techniques for the design of hollow core
slabs and beams with precast and prestressed straight cable, considering the calculation of
both the immediate losses as the time-dependent. For the slabs formulation allows the
designer to obtain the optimal dimensions of the height of the panel, the diameters of the
cables and the alveoli, and the number of cables. The beams are obtained beam height,
diameter and the number of cables. Are still subject to the conditions of service for bending
stresses, constructive limitations and failure conditions. Illustrative examples are presented
using the Branch and Bound algorithm and Lingo (PLS), further comparison is made between
the weight and the cost of the panel, and from the results of the algorithm and sizing Munte
tables that follow Brazilian standards. We conclude that the optimal design has many
advantages compared to conventional design, methods of discrete variation that best
characterize the optimal variables of the problem, restrictions on the normal stresses ELS are
crucial in obtaining the optimal dimensions of the structures and lower panels weight does not
necessarily represent the lowest cost.
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VASCONCELOS, R. F. Otimização de elementos pré- moldados de concreto: lajes alveolares e vigas com cabo reto. 2014. 118 f. Dissertação (Mestrado em Geotecnia, Estruturas e Construção Civil) - Universidade Federal de Goiás, Goiânia, 2014.