Static And Dynamic Analysis Of Seismic Behavior Of Self-Centering Energy Dissipative Rocking Reinforced Concrete Frame Structure Based On Incremental Loading

Reinforced concrete structure is the main structure system in our country,but under the action of several large earthquakes,reinforced concrete structure has not achieved the anticipated seismic effect.At present,the "recoverable function" of the structure system is realized mainly by means of swing structure,self-reset structure and replaceable components.Therefore,based on the previous research results of Rocking Column and Self-Centering Energy Dissipative Brace(SCEDB),a new frame structure,namely Self-Centering Energy Dissipative Rocking RC Frame structure system(SCEDR-RCF),is proposed in this paper.In this system,the Self-Centering Energy Dissipative Rocking Column formed by the combination of the rocking column and the Self-Centering Energy Dissipative Brace is placed in the RC frame.Based on the fact that the rocking column can reduce the response performance of the structure by weakening the restraint between the structure and the foundation,concentrated energy consumption and self-centering characteristics of SCEDB could reduce the residual deformation after earthquake and realize the resilience of the structure.The specific research contents and conclusions of this topic are as follows:(1)Introduced the basic theoretical knowledge of pushover analysis.Compared with the traditional seismic design method based on force-displacement curve,this paper chooses capacity demand spectrum curve to analyze and evaluate the seismic performance of structural system.Based on the theoretical knowledge of how to select the loading mode,how to transform the capacity demand spectrum curve and how to analyze the seismic performance points,it could be judged whether the structural system could satisfy the minimum performance requirements of "small earthquake is not bad","medium earthquake is repairable" and "large earthquake is not collapsed" in the seismic design code.(2)Based on OpenSees finite element software,three numerical models of plane frame structures are established and the pushover analysis is carried out respectively.The results showed that the structure with SCEDB could effectively control the vertex response of the structure,reduced the damage degree under earthquake and had more uniform inter-story displacement angle.(3)Established three Stereo Frame Models with OpenSees,the pushover analysis of three frames could be get,when the installation angle of SCEDB is 20°,the seismic performance of Self-Centering Energy Dissipative Rocking RC Frame structure is the best,within its allowable range.The seismic performance of the structure system could be improved by increasing the size of each component of Self-Centering Energy Dissipative Rocking Column;When the Self-resetting Energy Dissipative Rocking Column is located at the middle column,the seismic performance of the structure is the best.(4)Sixteen ground motion records were selected to analysis the whole process of Self-Centering Energy Dissipative Rocking RC Frame Structure from elasticity to elastoplasticity to collapse.The vulnerability analysis based on IDA was carried out and compared with the traditional structure.Based on the IDA curves obtained,the failure probability of Traditional Frame structure and Self-Centering Energy Dissipative Rocking RC Frame structure under minor damage、moderate damage、 severe damage and collapse states are compared and analyzed,and the seismic performance of the structure system is evaluated.The results showed that the Self-Centering Energy Dissipative Rocking RC Frame structure with viscous dampers under minor damage、moderate damage、 severe damage and collapse states has lower failure probability than the traditional frame structure,and its seismic performance is better.