基于塑性铰模型的双肢薄壁墩抗震性能研究  

Study on the seismic behavior of double-limb thin-walled piers based on plastic hinge model

作　　者：陈爱军[1] 彭容新 贺国京[1] 王解军[1] CHEN Aijun;PENG Rongxin;HE Guojing;WANG Jiejun(School of Civil Engineering, Central South University of Forestry and Technology,Changsha 410004,China)

机构地区：[1]中南林业科技大学土木工程学院

出　　处：《自然灾害学报》2019年第3期130-140,共11页Journal of Natural Disasters

基　　金：国家自然科学基金项目(51178473)~~

摘　　要：为研究基于塑性铰模型的双肢薄壁墩的抗震性能,结合 4种塑性铰模型、基底纵筋滑移模型及双肢薄壁墩简化计算模型,计算其在低周反复荷载作用下的墩顶变形及抗推承载力。建立空间非线性模型,计算分析该桥墩在低周反复荷载作用下的力学性能及破坏形态。同时,制作双肢薄壁墩的缩尺模型,通过拟静力试验研究其破坏形态、滞回曲线及骨架曲线。结果表明:理论计算、数值模拟与试验结果吻合良好,理论计算模型能够对该试验墩在低周反复荷载作用下的抗推承载力进行较为准确的计算,而且有限元模型可对破坏形态进行仿真;试验墩主要呈现以弯曲破坏为主的“弯剪破坏模式”,滞回曲线“捏缩”效应明显;参数分析结果表明体积配筋率及混凝土强度对该桥墩抗震性能的影响较小,而纵筋率与轴压比对其力学性能的影响较大,其中轴压比取5%时试验墩延性最差,取 10%时的延性最好。In order to study the seismic behavior of double-limb thin-walled piers based on plastic hinge model, the deformation and the thrust bearing capacity of pier under low cyclic loading are calculated by combining four kinds of plastic hinge models, the longitudinal rib slip model and the simplified calculation model of double-limb thin-walled pier. A spatial nonlinear model is established. The mechanical properties and failure modes of the pier under low cyclic loading are calculated. At the same time, scale models of double-limb thin-walled piers are made. And the failure mode, hysteretic curve and skeleton curve are studied by the pseudo static test. The results show that the theoretical calculation, numerical simulation and experimental results are basically consistent. The theoretical calculation model can be used to calculate the thrust bearing capacity of the test pier under low cyclic loading. And the finite element model can simulate the failure mode of test pier. The test pier mainly presents the bending-shearing failure mode with bending failure as the main. The effect of pinch and contraction is obvious from the hysteretic curve. The result of the parameter analysis shows that the volume reinforcement ratio and the concrete strength have less influence on the seismic performance of the pier. But the longitudinal reinforcement ratio and the axial compression ratio have great influence on the mechanical properties of test pier. The ductility of the test pier is the worst when the axial compression ratio is 5%, and the ductility of the test pier is the best when the axial compression ratio is 10%.

关 键 词：大跨连续刚构桥 双肢薄壁墩 低周反复荷载试验 抗推性能 延性性能 塑性铰模型 

分 类 号：U443.22[建筑科学—桥梁与隧道工程] X9[交通运输工程—道路与铁道工程]