Análise da influência da alteração de parâmetros de dimensionamento no custo de uma estrutura de concreto armado

Abstract

The structural design has evolved with the development of resources, especially computational ones, for analyzing the behavior of the structure. As a result, there is a responsibility and a need for civil engineers to use them in order to conceive increasingly efficient buildings. Cost minimization is one of the requirements of structural optimization, and there are different techniques to apply it. This present monograph examined the relationship between the alteration of design parameters (geometric dimensions of structural elements and concrete strength class) with the construction cost for a nine-story multifamily building, with a total area of 2700 square meters, located in the city of Garibaldi, Rio Grande do Sul. Forty-eight structural arrangements were defined, based on the variation and combination of parameters, and modeled in the TQS structural calculation software, starting from the pre-dimensioning condition. Based on the resulting material quantities for each case, the structure was budgeted using SINAPI cost references. A trend was observed, establishing that an increase in the concrete class leads to an increase in the structure's cost, while, on the other hand, a reduction in the dimensions of structural elements results in a cost reduction. Furthermore, a particular behavior was noticed in pillars regarding concrete strength, contrary to the linearity of the overall arrangement, presenting an optimal relationship with class C35. Finally, the arrangement that demonstrated the lowest execution cost was presented, showing a potential total reduction of 7.2% compared to the initial cost (from pre-dimensioning). Thus, it is possible to assert that there is an opportunity for savings by analyzing and determining the optimal design parameters for a reinforced concrete structure. [resumo fornecido pelo autor]