Comportamento do sistema estrutural em edifícios altos de concreto armado considerando a influência das modelagens do núcleo rígido

Abstract

The structural system formed by means of rigid frame and rigid core is one of the most used solutions in buildings to absorb the lateral action of the wind and to provide stability to the structure. The rigid core consists of the junction of wall framed, usually in C section, which leads to a shear center not coincident with the center of gravity of this section. One of the most common modeling to simulate the rigid core is to consider it as a single bar in its center of mass, but this solution can lead to results that are not representative of the real situation. In order to investigate the behavior of the structural system in high reinforced concrete buildings considering the influence of rigid core modeling, twelve models were designed using the CAD/TQS system as the analysis tool. To verify the results obtained in the CAD/TQS in Appendix A, a study was developed using Abaqus/CAE software and consistency was observed between the results. Three analyses are performed: 1) global stability by means of the coefficients Yz, FAVT and RM2M1; 2) lateral displacement; 3) magnitude of loads and of flexural and torsional stresses. The study showed that changing the modeling of the core considerably alters the lateral displacement and bending and torsional stresses of the building. It has been found that as the rigid core moves away from the center of mass of the floor, the building becomes more flexible, thereby increasing the torsional stress.