一种体外预应力钢筋混凝土摇摆框架抗震性能研究

摘要

体外预应力摇摆框架(External Prestressing Rocking Frame,EPRF)是一种新型的采用结构控制技术的抗震结构体系.建立了单榀体外预应力摇摆框架的力学模型并推导其理论抗侧刚度公式;其次,建立了无阻尼耗能的体外预应力摇摆混凝土框架、有阻尼耗能的体外预应力摇摆混凝土框架以及常规钢筋混凝土框架的有限元模型;输入El Centro地震波采用ABAQUS有限元程序对三种框架进行了动力时程分析,得到了地震作用下的结构楼层位移响应、加速度响应和层间剪力响应,对比分析了三种框架的地震响应结果.研究结果表明,具有阻尼耗能的体外预应力摇摆框架能大幅度降低结构加速度和层间剪力响应,结构位移响应也能得到有效控制.%A new seismic-resistance structure called the external prestressed rocking frame (EPRF) using the structure-control technology was proposed.Firstly,the theoretical lateral-resistance stiffness formula for a single frame of EPRF structures was derived based on its mechanical model.Then,three finite element analysis models were built for comparative analysis,they were an EPRF without dampers,an EPRF with dampers and a conventional frame.Finally,the seismic responses of the three frames including story drifts,story accelerations and inter-story shear forces were calculated with ABAQUS software using the time-history dynamic analysis and inputing the ground motion of El Centro earthquake wave.The comparison results showed that the EPRF structure with energy-dissipating dampers can greatly reduce the structural story accelerations and inter-story shear forces,and the structural displacement responses can be controlled effectively.