自复位RC框架柱脚抗震性能模拟分析研究

Simulation analysis of self-centering RC column base joints

针对一种带钢套靴的自复位RC框架柱脚,在分析其受力机理的基础上,采用有限元模型对不同轴压比下柱脚的抗震性能进行了模拟分析,并与试验结果对比分析,结果表明:模拟分析和试验所得的滞回曲线在各加或卸载段、峰值特征点和柱脚开口情况均吻合较好,验证了本文有限元模型的有效性.最后通过参数分析,对比研究了不同初始预应力筋面积、预应力筋初始应力、耗能元件面积、轴压比对自复位柱脚抗震性能的影响规律,为该节点的抗震设计提供参考.

Point at a kind of self-centering RC column base joints with steel shoes,based on the structure and mechanics performance of the joints,seismic behavior of the column base joints under different axial compression ratio was simulated and analyzed by finite element method,and compared with the test results.The results indicated that in the aspects of hysteretic curve,peak value point at each level and opening situation of column base,analysis results were consistent with experimental results which proved the validity of the finite element model.Finally,seismic behavior of self-centering RC column base joints under different area of prestressed bar,initial stress of prestressed bar,area of energy dissipative element,axial compression ratio was researched by parameter analysis,which also provided reference for seismic design of the joints.