基于双向拟静力试验的钢筋混凝土箱型薄壁墩抗震性能  

Seismic performance of reinforced concrete thin-walled piers with rectangular hollow cross-sections based on bi-axial quasi-static testing

作　　者：夏樟华[1] 宗周红[2] 钟儒勉[2] 

机构地区：[1]福州大学土木工程学院,福州350108 [2]东南大学土木工程学院,南京210096

出　　处：《东南大学学报（自然科学版）》2013年第1期180-187,共8页Journal of Southeast University：Natural Science Edition

基　　金："十二五"国家科技支撑计划资助项目(2011BAK02B03);教育部博士点基金资助项目(20110092110011)

摘　　要：对14个钢筋混凝土箱型薄壁墩进行了双向拟静力试验,考察了长细比、轴压比、配箍率等对箱型薄壁墩双向荷载-位移滞回曲线、骨架曲线、位移延性、滞回耗能和极限曲率等特性的影响,讨论了箱型薄壁墩的双向滞回性能.结果表明:在水平双向反复荷载作用下,箱型薄壁墩以弯曲破坏为主,低墩破坏区域集中于墩底,高墩的破坏区域明显上移;长细比越大,轴压比越小的箱型薄壁墩滞回曲线越饱满,变形能力越大;在长细比为6.9～13.1的范围内,位移延性系数随长细比的增大而减小,长细比为16.3的试件位移延性系数明显增大;长细比大于13.1的试件塑性破坏范围明显增大,但极限曲率显著降低.Bi-axial quasi-static tests on 14 reinforced concrete thin-walled piers with rectangular hollow cross-sections were carried out. The bidirectional seismic properties, including load-displace- ment hysteresis curve, skeleton curve, displacement ductility, hysteretic energy and ultimate curva- ture, were discussed in consideration of the influence of slenderness ration, axial-load ratio and ratio of reinforcements. Results show that flexural failure is the main failure mode of the piers, the dam- age area of short piers focuses on the bottom area while the damage area of high piers moves upward obviously. The piers with bigger slenderness ratio and smaller axial-load ratio have more full hystere- sis curves and bigger deformation capacity, which reveals excellent seismic performance. As the slenderness ratio ranges from 6.9 to 13.1, the displacement ductility of the pier decreases as slender- ness ratio increases, but the displacement ductility of the pier with a slenderness ratio of 16.3 is ob- viously big. The piers with slenderness ratio bigger than 13.1 have big plastic damage area, but their ultimate curvature declines obviously.

关 键 词：箱型薄壁墩 双向拟静力试验 滞回性能 滞回耗能 位移延性 极限曲率 

分 类 号：U443.22[建筑科学—桥梁与隧道工程] TU375.3[交通运输工程—道路与铁道工程]