Study On The Dynamic Performance Of Framed Self-Centering Wall Structure Under Earthquake Excitation

The traditional seismic structure is designed based on the three-level seismic precautionary requirements,but there is no explicit requirement for controlling damage.Under the strong earthquake,the structure may be severely damaged and produce large residual displacement,making it difficult to resume normal use and having to be removed.Based on this,the self-centering structure has attracted extensive attention in the field of seismic engineering because it generates almost no residual displacement after the earthquake and can be quickly restored without repair or after a small amount of repair.The framed self-centering wall structure is a new type of structure composed of self-centering wall structure and framed structure.At present,there are few studies on its dynamic performance.In this paper,for the framed self-centering wall structure,the mechanical analysis model is first proposed,and then the theoretical analysis and numerical simulation method are used to study the dynamic performance under earthquake excitation.The main work and research results of this paper are as follows:(1)For the framed self-centering wall structure,the self-centering wall is assumed to be a rigid body and the framed is simplified into a multi degree of freedom system,and the "rigid body-multi degree of freedom system" analysis model is obtained.Based on the model,the equation of motion under earthquake excitation is established.(2)Based on the above equations,a response spectrum analysis method that can quickly estimate the elastic dynamic response of the framed self-centering wall structure is proposed.The results are compared with the results of Simulink dynamic simulation and Abaqus finite element analysis.The results show that: In general,the error of the elastic seismic response calculated by the three methods is small,indicating that the proposed response spectrum method has higher calculation accuracy.(3)The elastoplastic finite element analysis model of the framed self-centering wall structure is established by Abaqus software.The effects of the yield force of the framed structure and the damper,and the initial load of prestressed tendon on the elastoplastic dynamic response of the structure are studied by variable parameter analysis.The results show that in the range of parameter variation,reducing the yield strength of the framed structure,and increasing the initial load of the prestressed tendon or the yielding force of the damper can reduce the residual displacement of the framed self-centering wall structure,and the yield force of the framed structure has a more obvious influence on the residual displacement;increasing the yield force of the framed structure can significantly reduce the maximum displacement of the framed self-centering wall structure,while the initial load of the prestressed tendon or the damper yielding force has little effect on the maximum displacement of the structure.