Seismic behavior analysis of core-RC and composite frame hybrid structure in high-rise buildings based on pushover analysis

In order to study the seismic behaviors of core-RC and composite frame hybrid structures in high-rise buildings,a 30-story hybrid structure was analyzed.The space finite element models were established.According to section bearing capacity and deformation capacity,the plastic hinge characteristic values of steel reinforced concrete members were defined by user.The three vertical truss element models were used to simulate shear wall,in which axial,shear and bending deformations were considered by each element.The horizontal load was applied respectively by constant acceleration and mode combination of complete quadratic combination during the pushover analysis.The target displacement of structure under earthquake action was determined with capacity spectrum method.The results show that the floor position of the maximum of story drift ratio is continuously dropped while the hybrid structure is gradually into the elastic-plastic state;story drift ratios of the middle to lower floors significant change;shear redistribution occurs at the middle to lower floors;the connection type between frame and core have significant impact on states under rare earthquake action;shearing stiffness degradation of core is significantly different,especially within the lower floors of a third of structure height;overall rigidity degradation of rigid connection model is worse than the hinged connection model.