【摘要】 通过对已完成的配置HRB500级钢筋混凝柱在低周反复水平荷载作用下的受力性能模拟分析,验证了经过二次开发的FEAP非线性有限元软件能够对此类柱的抗震性能影响因素进行系统分析。利用FEAP程序完成了不同轴压比和不同配箍特征值的162根配置HRB500级钢筋混凝土柱的抗震性能模拟分析。分析结果表明:柱的位移延性系数随轴压比的增大呈指数减小,随配箍特征值的增大近似呈线性增加;在配箍特征值一定的情况下,轴压比较小时,柱位移延性系数随纵筋配筋率的增大而减小,轴压比较大时,位移延性系数随纵筋配筋率的增大略有增大。通过对计算数据的回归分析,得出受轴压比、配箍特征值、纵筋配筋率和纵筋强度影响的配置HRB500级钢筋混凝柱的位移延性系数计算式,模拟结果与试验结果吻合较好。更多还原

【Abstract】 Based on the numerical simulation analysis of the behavior of tested RC columns with HRB500 longitudinal reinforcement,it is verified that the FEAP,a nonlinear finite element analysis software,can be used to conduct systematic parametric analysis on seismic behavior of RC columns.With this software,seismic behavior of 162 columns reinforced with HRB500 longitudinal steel bars were studied,considering different hoop characteristic values,different longitudinal bar ratios and different axial compression ratios.Simulation analysis and experimental results show that the column displacement ductility factor decreases exponentially with the increase of axial compression ratio,while increases linearly with the increase of the hoop distribution characteristic values.Under constant hoop distribution characteristic values,the displacement ductility coefficient decreases with the increase of longitudinal reinforcement ratio when the axial compression ratio is small,while increases slightly with the increase of longitudinal reinforcement ratio when the axial compression ratio is large.An equation for the calculation of the displacement ductility of columns considering these three parameters was obtained by the regressive analysis based on the simulation results.更多还原