摘要
为了对桥梁地震反应做出更准确的判断,基于ANSYS提出综合考虑混凝土挡块特性以及梁体与挡块碰撞效应的模拟方法。以韩江大桥的非规则多跨连续梁桥为研究对象,分析在混凝土挡块4种不同模拟情况下的结构地震反应,研究挡块性能参数的影响规律,并探讨减碰措施。研究结果表明:混凝土挡块限制梁体位移,但同时将梁体惯性力传递给桥墩,从而影响整体结构地震反应。忽略挡块性能或梁体与挡块的初始间隙都会导致地震反应分析产生偏差。增加挡块强度可提高其限位能力,但过大的挡块强度也会导致极大的桥墩内力。提高挡块的变形能力有利于减小碰撞力与挡块损伤。橡胶垫片是较宜采用的减碰措施,可进一步减小梁墩相对位移与碰撞力,减轻挡块损害。
In order to have more realistic predictions of bridge structures’seismic responses,a modeling method based on ANSYS was proposed,which can simulate concrete shear keys’characteristics and pounding between the girder and shear keys.The irregular multi-span continuous bridge of Hanjiang Bridge was taken as the research object.The seismic responses with four different modelling methods for concrete shear keys were analyzed.Then a parametric study of concrete shear keys’characteristics was conducted.Finally a proposed pounding mitigation method was discussed.The results show that concrete shear keys restrain the girder’s displacement and transmitter seismic forces from the girder to substructures,which affect the overall bridge responses.Ignoring concrete shear keys’mechanical properties or initial gaps between the girder and shear keys can lead to erroneous results.Increasing shear keys’strength can improve its limit capability.But an excessive value of the strength will cause great internal forces in the piers.A better deformation capability of shear keys can make pounding forces smaller and reduce shear keys’damages.Applying rubber bumpers to shear keys is a proper pounding mitigation method.Rubber bumpers can further reduce relative displacements of the girder and piers and pounding forces,so as to mitigate shear keys’damages.
作者
夏人杰
赵人达
占玉林
XIA Renjie;ZHAO Renda;ZHAN Yulin(Department of Bridge Engineering,School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China;Shanghai Municipal Engineering Design Institute(Group)Co.,Ltd,Shanghai 200292,China;National Engineering Laboratory for Technology of Geological Disaster Prevention in Land Transportation,Chengdu 610031,China)
出处
《铁道科学与工程学报》
CAS
CSCD
北大核心
2018年第8期1987-1995,共9页
Journal of Railway Science and Engineering
基金
国家重点研发计划资助项目(2016YFB1200401)
广东省交通运输厅科技计划资助项目(科技-2014-02-015)
四川省科技计划资助项目(2017GZ0369
2018GZ0052)
关键词
混凝土挡块
非规则连续梁桥
地震反应
强度
变形能力
初始间隙
减碰措施
concrete shear key
irregular continuous girder bridge
seismic response
strength
deformation capability
initial gap
pounding mitigation method
