Research On Seismic Performance Of Buckling Restrained Brace Reinforced Single-Span Concrete Frame Structure

The classroom building of single span framework is a special structure in the frame structure, created in1980s to1990s. The earthquake damage over the years at home and abroad showed that the seismic capacity of this type of building is poor, created a significant danger to the safety of the people。So on the basis of summing up the historical experiences and lessons of predecessors,the construction of the new design should try to avoid using single span frame structure and the already-built single span frame structure shall be appraised for their earthquake-resistance capability and reinforcement in order to improve the seismic capacity. Buckling Restrained Brace used in reinforcement of primary and secondary schools teaching building is also few in number.The analysis shows Buckling Restrained Brace possesses a good property for absorbing energy and remain unyielding in the small and middle earthquakes. In rare earthquakes, buckling energy consumption can be the first to yield for energy consumption, to protect the main structure does not be destroyed and to improve the overall seismic performance of the structure.This paper, starting with the structure and classification of Buckling Restrained Brace, and studies the theory, summarizes the calculation of Buckling Restrained Brace stiffness and damping, as well as to determine the restoring force curve and then summarize Buckling Restrained Brace in SAP2000in the simulation and parameter settings.Building school buildings of typical single span frame structure, analysis the reinforcement of the single cross-classroom building by Buckling Restrained Brace and steel support. With nonlinear time distance analysis, taking the three seismic waves in severe earthquakes, makes a contrastive study of the single span structure, buckling Restrained Brace reinforcement structure and support to reinforce the structure from the point of view about vertex displacement, drift angle, vertex acceleration, base shear, supporting the axial force, obtained superior seismic performance of buckling Restrained Brace reinforced single cross-classroom building and its applicability.A nonlinear static analysis (on Pushover analysis) is performed on Buckling Restrained Brace reinforced single cross-classroom building. Buckling Restrained Brace is equivalent to the stiffness of the linear unit and evaluate the seismic performance of reinforcement. And then according to the structure of the plastic hinge, the hinge sequence, drift angle to determine the reinforcement to achieve the desired goals.Five different support arrangement programs are proposed about teaching building of a single cross-frame structure. A comparison is made between seismic and economic performances from the displacement angle, vertex displacement and acceleration and analysis a reasonable layout programs and economic benefits. Buckling Restrained Brace quality, effective rigidity and plastic stiffness than three parameters to explore the impact of the seismic performance for the future selection of Buckling Restrained Brace must learn from.