摘要
为研究框架柱在水平和竖向双向地震作用下轴力变化时的性能,以1根足尺钢筋混凝土柱(RC柱)为试验子结构,进行了5种不同工况下的双向拟动力试验。通过对试验现象的观察和试验结果分析,从柱子刚度、滞回曲线、裂缝开展情况和框架整体水平位移响应等方面分析了试验框架的抗震性能,结果发现:试件对同加速度峰值不同周期地震波的双向地震作用的响应差异很大。由于二阶效应等的影响,轴力变化时特别是变化不规则时会导致试件侧向位移偏向结构一边,在地震动加速度峰值较大时轴力变化对试件滞回性能产生的影响不能忽略。采用基于OpenSees的纤维模型对试件加载情况进行模拟,发现在弹性阶段模拟值拟合较好,但在损伤较大时模拟值与试验值相差较大。
In order to study the performance of the frame column under the variety of axial force and bidirectional earthquakes,a pseudo-dynamic test of the substructure of a full-scale reinforced concrete column(RC column)under 5 different working conditions was performed.The seismic performance of the test specimens was investigated from several aspects such as stiffness,hysteresis behavior,crack development and horizontal displacement response of the frame.The results show that the seismic response of the same component under different seismic waves is very different.Bidirectional earthquake action will cause a large asymmetry in the lateral displacement of structural members,and the axial force variety caused by vertical earthquakes cannot be ignored when the peak acceleration of ground motion reach to a high level.The horizontal response of the frame meets the requirements of the specification for the displacement angle between layers.The fiber model was used to simulate the test loading conditions using OpenSees.It was found that the simulated values fit well in the elastic phase,but differ greatly from the experimental values when the damage is large.
作者
郭玉荣
陈展
GUO Yurong;CHEN Zhan(College of Civil Engineering, Hunan University, Changsha, Hunan 410082, China;Key Laboratory of Construction Safety and Energy Efficiency, Ministry of Education, Changsha, Hunan 410082, China)
出处
《公路工程》
2021年第4期23-30,45,共9页
Highway Engineering
基金
国家自然科学基金项目(51878259,51161120360,91315301-09)。
关键词
钢筋混凝土足尺柱
变轴力
双向地震
拟动力试验
子结构
reinforced concrete full scale column
variable axial force
bidirectional earthquake
pseudo-dynamic test
substructure
