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孟二从*,余亚琳,苏益声,陈宗平.方钢管混凝土框架抗震性能及P-Δ效应研究[J].实验力学,2018,33(2):219~227
方钢管混凝土框架抗震性能及P-Δ效应研究
On the seismic performance and P-Δ effect of concrete-filled square steel tubular frame
投稿时间: 2016-12-12  最后修改时间: 2017-03-22
DOI:10.7520/1001-4888-16-269
中文关键词:  方钢管混凝土框架  抗震性能  试验研究  P-Δ效应
英文关键词:concrete-filled square steel tubular frame  seismic performance  experimental study  P-Δ effect
基金项目:国家自然科学基金资助项目(51468003), 中国博士后科学基金资助项目(2017M623302XB), 重庆市项目博士后资助(Xm2017033), 西南大学博士基金项目(SWU116071)
作者单位
孟二从* 1.西南大学 工程技术学院, 重庆 400715 2.广西大学 土木建筑工程学院, 南宁 530004 
余亚琳 西南大学 工程技术学院, 重庆 400715 
苏益声 广西大学 土木建筑工程学院, 南宁 530004 
陈宗平 广西大学 土木建筑工程学院, 南宁 530004 
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中文摘要:
      为了对方钢管混凝土框架的抗震性能及P-Δ效应进行研究,设计制作了1榀方钢管混凝土框架进行低周反复加载试验。研究表明:方钢管混凝土框架试件的滞回曲线呈饱满的梭形,破坏时的等效黏滞阻尼系数为0.2241,表明该框架结构具有良好的抗震耗能性能;试件在正负向的平均位移延性系数为2.94,表现出了较好的延性性能;破坏时的平均位移转角为1/36,表现出了较强的抗倒塌能力;随着加载位移的增加,试件的残余变形及等效黏滞阻尼系数均会逐渐增大,而强度衰减幅度总体上呈现出先增大后减小的变化趋势,刚度退化速率呈现出先快后慢的变化趋势。最后基于试验数据,对P-Δ效应的影响进行了分析,提出了相关建议。上述结果可为相关的工程应用及理论分析提供参考。
英文摘要:
      In order to study the seismic performance and P-Δ effect of concrete-filled square steel tubular frame, a concrete-filled square steel tubular frame was designed and manufactured, based on which, low cyclic repeated loading experiment was carried out. Results indicate that the hysteretic curve of specimen in concrete-filled square steel tubular frame presents plump shuttle shape. The equivalent viscous damping coefficient at break is 0.2241, which demonstrates that the frame structure has good seismic energy dissipation performance. The specimen's average displacement ductility coefficient along both positive and negative directions is 2.94, which shows good ductility performance. The average displacement angle at failure is 1/36, which shows good anti-collapse capacity. With the increase of loading displacement, both residual deformation and the equivalent viscous damping coefficient of specimen increase gradually, while the intensity attenuation amplitude presents generally increasing first and then decreasing trend, the stiffness degradation rate exhibits first fast and then slow trend. Finally, based on experimental data, the P-Δ effect on the frame was analyzed, and some suggestions were put forward. Above results may provide reference for some relevant engineering application and theoretical analysis.
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