（天津大学滨海土木工程结构与安全教育部重点实验室, 天津 300072）

［摘要］对5根RC矩形截面短柱在低周往复荷载作用下的抗震性能进行了试验研究，试验中在保持轴压比恒定的情况下水平方向采用3种双向加载路径（45°斜向、八字形和方形）以及2种单向加载路径（X向和Y向）。主要研究了不同加载路径对RC短柱的耗能能力、受剪承载力、刚度和延性等抗震性能的影响。结果表明：双向加载降低了试件的延性，大大降低了试件的承载力，但使得试件的累积滞回耗能显著增加；加载路径对试件的延性和刚度退化影响较小，对试件的累积滞回耗能影响较大。

［关键词］RC短柱； 双向加载； 加载路径； 抗震性能

中图分类号：TU375-3文献标识码：A文章编号：1002-848X(2018)02-0055-05

Experimental study on seismic performance of RC short column under varied loading paths

Li Zhongxian, Wei Di, Gao Ying

(Key Laboratory of Coast Civil Structure Safety of China Ministry of Education, Tianjin University, Tianjin 300072, China)

Abstract:The seismic performance of 5 reinforced concrete short columns with rectangular section under cyclic load was studied. In the case of a constant axial compression ratio in the test, 3 kinds of two-way loading paths (45 degrees oblique direction, splayed direction and square direction) and 2 one-way loading paths (X direction and Y direction) in horizontal direction were adopted. The effects of different loading paths on the energy dissipation capacity, shear capacity, stiffness and ductility of reinforced concrete short columns were studied. The results show that the two-way loading reduces the ductility of the specimens and greatly reduces the bearing capacity of the specimens, but makes the cumulative hysteretic energy of the specimens increase significantly; the loading path has little influence on the ductility and stiffness degradation of the specimens, and has a greater influence on the cumulative hysteretic energy dissipation of the specimens.

Keywords:RC short column; two\|way loading; loading path; seismic performance

*国家“973”计划课题(2011CB013603)，国家自然科学基金项目(91315301，51378341)。

作者简介：李忠献，博士，长江学者特聘教授，博士生导师，Email: zxli@tju.edu.cn。