强约束大尺寸钢筋混凝土柱抗震性能试验研究  

EXPERIMENTAL STUDY ON SEISMIC PERFORMANCE OF LARGE SCALE REINFORCED CONCRETE COLUMNS WITH STRONG CONFINEMENT

作　　者：张微敬[1] 张兵[1] 李振宝[1] 周宏宇[1] 

机构地区：[1]北京工业大学建筑工程学院,北京100124

出　　处：《工程力学》2013年第12期236-241,共6页Engineering Mechanics

基　　金：十一五国家科技支撑计划项目(2009BAJ28B01)

摘　　要：为研究箍筋强约束钢筋混凝土柱的抗震性能，完成了6个配箍特征值0．34-0．44、截面尺寸450mm×450mm的大尺寸钢筋混凝土柱试件的拟静力试验研究。结果表明，试件的破坏形态为压弯破坏，纵筋压曲甚至断裂，部分试件箍筋拉断，底部1倍柱截面高度范围内混凝土保护层剥落，箍筋约束核心区混凝土局部压碎。试件水平力一位移滞回曲线饱满，极限位移角达到1／39～1／33，延性系数均大于3．0。对于箍筋强约束柱，改变箍筋形式或改变箍筋肢距，对其正截面承载力及极限变形能力影响不大；相同位移往复加载由3次增加至5次，对其正截面承载力及峰值位移影响不大，但变形能力降低约15％。To investigate the seismic performance of reinforced concrete columns with strong confinement, quasi-static tests on six full-scale reinforced concrete columns with stirrup characteristic values in the range of 0.34-0.44 and with section dimension 450mm×450mm were conducted. The test results indicated that the failure modes of specimens were compression-bending; the longitudinal bars buckled in compression and even broke; several stirrups fractured. Within a height of one time of column depth above the column bottom the concrete cover spalled seriously and the confined concrete partially crushed. The lateral force-displacement hysteretic loops were plump, the ultimate drift ratios ranged from 1/39 to 1/33 and the ductility coefficients were greater than 3. Changing the stirrup types or changing the space of stirrup legs had little effects on the load-carrying capacity and ultimate deformation capacity of specimens. Increasing the number of lateral loading cycle from 3 to 5 had little effects on the load-carrying capacity and peak deformation of specimens, but led to about 15% decrease of the deformation capacity.

关 键 词：箍筋强约束 大尺寸 钢筋混凝土柱 抗震性能 拟静力试验 

分 类 号：TU318[建筑科学—结构工程]