柱端铰型受控摇摆式钢筋混凝土框架抗震性能有限元分析

Finite element analysis on seismic performance of controlled rocking reinforced concrete frame with column-end-hinge joints

柱端铰型受控摇摆式钢筋混凝土框架结构（CR-RCFC）是一种新型消能减震结构体系。根据CR-RCFC摇摆机制及其节点构造,建立了CR-RCFC和常规框架的有限元模型,并对其进行地震作用下动力时程分析,得到了不同地震作用下结构的动力特性、加速度响应、位移响应和基底剪力响应,对比分析了CR-RCFC与常规框架的抗震性能,并与振动台试验结果进行对比,验证数值建模及分析结果的正确性。研究结果表明：CR-RCFC结构因节点刚度弱化、抗侧刚度降低,其地震加速度响应比常规框架的小;通过设置层间阻尼器耗能装置使得CR-RCFC结构在地震作用下的结构整体位移得到有效控制;在遭遇罕遇地震作用时,CR-RCFC主体框架保持完好,无明显损伤,抗震性能良好。

Controlled rocking reinforced concrete frame with column-end-hinge joints（CR-RCFC） is a new type energy-dissipation and seismic-reducing structural system. The rocking mechanism and construction details of rocking joints were introduced and the finite element models of CR-RCFC and conventional frame were built with time-history analysis method. The dynamic characteristics, acceleration responses, shear force responses and displacement responses of above mentioned models under different earthquake levels were discussed,and compared with the results of shaking table tests to validate the numerical modeling. Research results indicate that CR-RCFC has lower acceleration response due to its weakened joint stiffness and lower lateral resistance stiffness. The displacement response of the CR-RCFC can be controlled effectively by inter-story dampers,and the mainbody of the CR-RCFC keeps damage-free during rare earthquake,which indicates that CR-RCFC has an excellent seismic performance.