FRP布约束RC矩形空心桥墩抗震性能试验研究  

Tests for aseismic performance of RC rectangular hollow bridge piers constrained with FRP

作　　者：张冬杰[1] 韩强[1] 杜修力[1] 董振华[1] 

机构地区：[1]北京工业大学城市与工程安全减灾教育部重点实验室,北京100124

出　　处：《振动与冲击》2013年第22期152-157,共6页Journal of Vibration and Shock

基　　金：973计划项目(2011CB013600);国家自然科学基金资助项目(50908005;50938006);NSFC-JST资助项目(51021140003)

摘　　要：为研究纤维增强复合材料(FRP)布约束钢筋混凝土(RC)矩形空心桥墩抗震性能,进行六个高宽比为4的矩形空心桥墩拟静力试验研究,分析FRP布约束矩形空心桥墩破坏形态、位移延性、耗能、最大水平承载力等抗震性能参数。试验结果表明:在轴压比0.2低轴压荷载作用下,采用FRP布加固可明显提高矩形空心桥墩的延性及耗能,位移延性系数及累计耗能分别提高65.4%,25.8%,但对最大承载力影响较小,仅提高3.0%。基于Clough退化双线性滞回模型,结合试验结果,建立考虑强度、刚度退化等FRP布约束RC矩形空心桥墩的简单滞回模型,给出其卸载刚度与再加载刚度的回归公式。In order to investigate the aseismic performance of reinforced concrete （RC） rectangular hollow bridge piers constrained with fiber reinforced polymer （FRP）, cyclic tests of six RC specimens with aspect ratio 4 under constant axial loads （axial compression ratio is 0. 2 ） and uniaxial bending were conducted here. The aseismic performance parameters including failure characteristic, flexural ductility, dissipated energy and lateral ultimate load capacity were analyzed. The test results indicated that the ductility and dissipated energy of the RC rectangular hollow bridge piers constrained with FRP are improved significantly; the displacement ductility coefficient and the total energy dissipation increase about 65.4% and 25.8%, respectively; the constrained behavior of FRP has little influence on the ultimate lateral force capacity of RC rectangular hollow bridge columns （it increases about 3.0% at most）. Based on the test results and Clough model, a simplified hysteretic model considering the strength and stiffness degradation effects of bridge piers constrained with FRP was established and its unloading stiffness and reloading stiffness regression formulae were deduced.

关 键 词：桥墩 矩形空心截面 FRP布加固 抗震性能 滞回模型 fiber REINFORCED polymer (FRP) 

分 类 号：U442.55[建筑科学—桥梁与隧道工程]