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In the actual time, exist a hard computing development in structural analyses with geometrical loads and known boundary conditions. As the processors, on has expand much effort in pre and pos-processors, which are responsible for the big part of the time dedicated to a design. However, the automatic definition of the element structural geometric characteristics are yet small. Today, this phase is yet do for the engineer, only with an indirect help of the machine. This work presents an optimal method to do automatically the “pre-dimensionamento” of the beams of the floor in concrete reinforced. It was developed a formulation for minimization the transversal cross-section cost, which, “atraves” of a combination approximation method, on has the beams minimum cost of the floor. The function cost variables are: the beam depth and the steel area. The problem constraints are: the steel geometric rate, the steel compression with the steel tension rate and the limit displacement “pre-definided” for the user.

Otimização de seções transversais de concreto armado sujeitas à flexão: aplicação a pavimentos