Evaluation Method for Seismic Toughness of Steel Frame Buildings with Buckling Constraint Braces Based on the Whole Construction Process

Abstract

As a common building structure, steel frame building is of great significance in seismic design and construction in earthquake areas. However, the traditional steel frame structure is brittle under earthquake, which is prone to buckling instability and serious damage. Therefore, taking the whole construction process as a parameter index, the buckling-restrained brace-steel frame structure is strengthened, and different seismic waves are selected as seismic input to analyze and study its seismic capacity under earthquake action. The research results show that: (1) The steel frame with buckling-restrained braces still has strong seismic toughness when there is a large stiffness loss in the earthquake; (2) The base shear curve of building buckling-restrained brace-steel frame in X direction increases exponentially; (3) Buckling-restrained brace-steel frame has high shear force shared by columns and axes in X direction under strong earthquake, which can effectively realize the function of secondary protection; (4) The short duration of strong earthquake has little influence on the hysteretic energy consumption ratio, while the damage of the long duration of strong earthquake to the building buckling restrained brace-steel frame increases with the increase of strong earthquake duration; (5) Buckling restrained brace-steel frame has good deformability and can adapt to earthquake load through plastic deformation