摘要
方钢管混凝土柱是框架结构主要抗侧力构件,决定着整个建筑的抗震性能。为改善方钢管混凝土柱抗震性能,提出了外包碳纤维布和外包钢套加固柱的方法。通过低周反复荷载作用下3根加固方法不同的方钢管混凝土柱的试验结果,对比了外包碳纤维布和外包钢套加固柱2种方法的加固效果,分析了相应的加固机理。通过对试件滞回曲线、骨架曲线、延性、耗能能力、承载力和刚度退化等抗震性能指标分析结果表明,碳纤维布加固对承载力和刚度提高不明显,但明显改善了试件的延性,从而提高了试件的抗震性能;外包钢套加固在提高柱承载力、刚度及抗震性能方面均具有显著效果;从提高承载力和耗能能力来看,外包钢套用于方钢管混凝土柱的抗震加固效果更优。
The CFSST columns are the major lateral force-resisting member in the frame structure,which determines the seismic behavior of the whole building.In order to improve the seismic behaviors of columns,two reinforcement methods,such as carbon fiber reinforced polymer(CFRP)and enveloped steel,are proposed in this paper.Through the test results of three columns strengthened by different methods under cyclic loads,the reinforcement effect of two methods is compared and the corresponding reinforcement mechanism is analyzed.Based on the test data,the hysteretic loops,skeleton curves,ductility,dissipative ability,ultimate strength and stiffness degradation,etc.are obtained.Results show that the rehabilitation with carbon fiber reinforced polymer(CFRP)has limited increment to the ultimate strength and stiffness,but it can apparently improve the ductility and the seismic performance of specimens;While the method of enveloped steel has significant improvements in both the strength and stiffness and all aspects of seismic performance.From the point of improving the bearing capacity and energy dissipation capacity,the method of enveloped steel has better reinforcement effects when it is used in strengthened CFSST columns.
出处
《长江大学学报（自科版）（上旬）》
CAS
2015年第9期46-51,5,共6页
JOURNAL OF YANGTZE UNIVERSITY (NATURAL SCIENCE EDITION) SCI ＆ ENG
基金
国家自然科学基金项目(51178057)
湖北省高等学校优秀中青年科技创新团队计划项目(T201303)
关键词
方钢管混凝土柱
加固
外包碳纤维布
外包钢套
拟静力试验
抗震性能
concrete filled square steel tube(CFSST)column
reinforcement
carbon fiber reinforced polymer(CFRP)
enveloped steel
quasi-static test
seismic behavior
