建筑结构学报2024，Vol.45Issue(5)：155-163,9.DOI:10.14006/j.jzjgxb.2023.0105
双轴加载下变轴力大尺寸钢筋混凝土柱抗震性能试验研究
Experimental study on seismic behavior of large size reinforced concrete columns under biaxial loading and variable axial loads
摘要
Abstract
To study the effects of biaxial loading and variable axial load on the seismic performance of large size reinforced concrete(RC)columns,quasi-static cyclic loading tests of four columns with dimensions of 600 mm x 600 mm in plan and 3.6 m in hight were carried out.The lateral loads include two loading patterns:unidirectional loading along the main axis and simulated bi-directional loading along the diagonal axis of the column section.The axial loading frequency was three times of the horizontal displacement loading.The seismic performance of the large size RC column specimens was discussed in terms of column's capacity,displacement ductility,stiffness degradation,and energy dissipation.The experimental results indicate that energy dissipation capacity of the columns can be enhanced under bi-directional horizontal loading when compared with unidirectional horizontal loading,but leading to faster stiffness degradation and lower ductility.The columns with and without axial loading variation shear the same failure mode,but the severity of damage is significantly affected by axial loading variation and the cracking of columns is restrained by larger axial compression ratio.When compared to columns under constant axial load,axial loading variation leads to an asymmetric lateral load-displacement hysteretic curve,in which the peak load and energy dissipation are increased on the side subjected to larger axial load,but with lower ductility and faster stiffness degradation.The pinching effect of the hysteretic curve is more severe when the columns are under bi-directional loading combined with variable axial load.关键词
钢筋混凝土柱/拟静力试验/双轴加载/变轴力/抗震性能Key words
reinforced concrete column/quasi-static test/biaxial loading/variable axial load/seismic performance分类
建筑与水利引用本文复制引用
郭玉荣,梁康殷,吕聪..双轴加载下变轴力大尺寸钢筋混凝土柱抗震性能试验研究[J].建筑结构学报,2024,45(5):155-163,9.基金项目
国家自然科学基金项目(51878259). （51878259）
