Estudo sobre a influência do efeito arco em paredes de alvenaria estrutural no dimensionamento de vigas de concreto armado

Abstract

Considering that the structural masonry system has shown a significant presence in the Brazilian civil construction market and that in most cases, the structural masonry building will be supported by transitional beams in reinforced concrete to meet the demands of building use , the present work aims to seek technical subsidies for a more coherent design, analyzing the main aspects resulting from this interaction between these two structural systems, considering the parameters for analyzing the arc effect, by the relative stiffness method, in different design situations. The models were analyzed in two loading situations, varying the length of the wall/beam set, without considering the boundary conditions of the elements. The results obtained present very important aspects to be considered in the design of transition structures, as well as in the masonry itself, since variations in the direction of stresses change the behavior of the two elements. The maximum bending moments acting on the beams considering the arc effect are almost ten times smaller than the moments resulting from the traditional methods of designing reinforced concrete beams, resulting in a significant reduction in the steel area needed, but counterpointing the masonry walls they end up being more requested in the absorption of the system's efforts, and should be resized for greater security and coherence in the redistribution of tensions. [resumo fornecido pelo autor]