基于OpenSees的RCS组合框架结构抗震性能模拟分析

Simulation and Analysis on Seismic Performance of RCS Frame Using OpenSees

选取已有钢筋混凝土柱—钢梁组合结构(RCS)框架的低周期反复试验数据,采用地震工程开源模拟软件OpenSees对其进行有限元模拟,对比骨架曲线与滞回曲线,试验结果与有限元结果吻合较好。随后考察弯矩放大系数(Mc/Mb=0.86、1.48、2.04)、柱轴压比(n=0.06、0.2、0.3、0.6、0.8)对抗震性能的影响,得到了各参数下框架的滞回曲线、骨架曲线和各特征阶段的荷载与位移值。分析了框架的破化过程、延性与强度退化。结果表明:RCS组合框架滞回曲线饱满,具有良好的变形及耗能能力;随着弯矩放大系数的减小、柱轴压比的增大,框架的水平极限承载力降低、屈服状态提前、位移延性降低。分析结果可供有关研究或工程应用参考。

Based on the low-cycle load test data of a Reinforced Concrete colum and Steel beam（ RCS）frame,finite element numerical simulation was conducted by using the open-source earthquake engineering simulation system OpenSees. Accuracy of the numerical analysis was verified by comparing the hysteretic curves with skeleton curves. Then,nine RCS frames were designed by changing the bending moment magnification coefficient beam to column（ Mc/Mb= 0. 86、1. 29、1. 48、2. 04） and the axial compression ratio（ n = 0. 06、0. 2、0. 3、0. 6、0. 8）. The load- displacement hysteretic loops,skeleton curves and the load and displacement values for different loading stages were obtained. The failure characteristics,ductility and load carrying capacity degeneration were studied. It is concluded that the load-displacement hysteretic loops are stable,and the deformation properties and energy dissipation capacity are adequate.With the decrease of the bending moment magnification coefficient and the increase axial load level of columns,the horizontal limit bearing capacity of the frame reduces and also is the displacement ductility.Conclusions obtained in this paper provide a reference for structural researchers and designers.