中国钢筋混凝土柱的位移角统计分析

Statistical Analysis of Displacement Angles of Reinforced Concrete Columns in China

根据收集到的80根中国的钢筋混凝土柱在固定轴向荷载和水平反复荷载作用下的试验结果,分析回归出试验柱的延性系数和各位移角与剪跨比、轴压比、配箍特征值之间的关系.结果表明:钢筋混凝土柱的延性系数随着轴压比和剪跨比的增加而减小,随配箍特征值的增加而增加,且都近似呈线性关系;随着轴压比的增大,屈服位移角和极限位移角均增大,最大位移角则随着轴压比的增大而减小;随着剪跨比的增大,屈服位移角、最大位移角和极限位移角均增大;随着配箍特征值的增大,屈服位移角、最大位移角和极限位移角亦相应增大.通过对试验柱位移角进行频数统计分析可知,我国建筑抗震设计安全水准偏低,现行规范的屈服位移角和极限位移角限值有提高的余地.

Based on the collected test results of 80 Chinese reinforced concrete columns under constant axial load and horizontal cyclic load, the relation of ductility coefficients and various displacement angles to shear span ratios, axial compression ratios and transverse reinforcement characteristic values are regressed. The results indicate that ductility coefficients of reinforced concrete columns linearly decrease with axial compression ratios and shear span ratios and increase with transverse reinforcement characteristic values. Yield displacement angles and the ultimate displacement angles increase with axial compression ratios, but maximal displacement angles loading decrease with axial compression ratios. Yield displacement angles, maximal displacement angles, and ultimate displacement angles increase with shear span ratios and transverse reinforcement characteristic values. By the frequency statistic research on displacement angles of reinforced concrete columns, it is found that the Chinese construction earthquake-resistance design safety criteria is relatively low, and the yield displacement angles and the ultimate displacement angles in current codes are capable to increase.