Estabilidade global de estrutura de edifícios considerando a influência da excentricidade na ligação viga-pilar parede

Abstract

The overall stability of building structures is a safety condition that must be met in all structural projects. Several factors influence stability, such as height of buildings, rigidity of component structural elements, bracing system, rigidity of beam-wall connections, among others. The overall stability of the structures is evaluated according to NBR 6118/2014 by the parameters α and γz. This work aims to evaluate the overall stability of structures of concrete models considering the influence of eccentricity on the beam-wall connection. The analyses carried out to reach the objective of the work were performed with the help of the software Abaqus© and TQS©. Based on initial buckling simulations and isolated wall-to-wall displacements, reported in Appendix B, frame models were analyzed, assessing the contribution of the eccentricity of the beam-wall connection for overall stability and for proper bond rigidity. The models were analyzed considering geometric nonlinearity. In the frame models, the stability parameters of NBR 6118/2014 were evaluated, as well as the flexibilization criteria of the TQS©, LEPMOL and REDMOL frame. The results of the displacement analyses indicated a considerable growth when the beam-wall connection becomes more eccentric, and there is an intensification of the growth for eccentricities near the end of the wall. Models with greater number of pavements are more unstable, presenting a more significant variation of the displacements with the eccentricity of the connection in relation to models with fewer pavements.