Análise de edifícios de andares múltiplos em estrutura mista de aço e concreto considerando as fases construtivas

Abstract

This work presents the results of the study addressed to the analysis of the loading steps and construction sequences of steel-concrete composite multi-story buildings. For this purpose, an object-oriented structural matrix analysis computational program was developed as a plugin for a graphical algorithm editor strongly integrated in a CAD application. The computational program performs incremental constructive procedures based on: (i) sequential addition and removal of loadings; (ii) accounting for structural deformation in composite construction by stages; (iii) stress state and stiffness update at the beginning of each stage analysis; (iv) sequential changes of the member properties, simulating concrete addition to the columns, beams and slabs; and (v) the adopted constraints for the simulation of the effect of the concrete floor slab diaphragms (very high in-plane stiffness). The evaluation of the results was achieved with the help of numerical examples, for which the incremental constructive procedure was taken into account and the obtained results compared with those obtained by conventional analysis. Relevant differences in terms of differential column shortening and horizontal displacements were observed, endorsing the importance of considering the constructive stages in steel-concrete composite multi-story buildings analysis.