Estudo paramétrico de estrutura de contraventamento: método dos pórticos planos compatibilizados no topo

Abstract

This work deals with a parametric study of the bracing structure of a multifamily building, by the method of the top-floor planar frames. The influence of the beams and pillars' transversal sections dimensions of the bracing frames were analyzed. In this analysis, the elements' transversal section dimensions suffered decrements of 5cm, from the dimensions provided in the model building design. The instability parameters of the structure were adopted as criteria in the present work, according to the recommendations of ABNT NBR 6118: 2014. The volume of concrete material required by the bracing structure was evaluated for the instability criteria. In the C ++ language, the method of the top-floor planar frames was used to determine the Wind load distribution, calculated according to ABNT NBR 6123: 1988, for multifamily structures. The structural analysis of the frames was done by FAST program, developed by the Laboratório de Mecânica Computacional e Visualização of the Universidade Federal do Ceará. This study showed the influence of beams and columns' stiffness on the bracing structure efficiency, furthermore the difference in the required material volume for this structure, when designed by the conventional process instead of conducting a sensitivity study of the main variables involved in a structural design, was showed.