| 极端温度对板式橡胶支座连续梁桥地震响应影响研究* |
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| 引用本文： | 杜新龙,虞庐松,王力,李子奇,张熙胤,刘彪.极端温度对板式橡胶支座连续梁桥地震响应影响研究*[J].中国安全生产科学技术,2022,18(10):210-215. |
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| 作者姓名： | 杜新龙 虞庐松 王力 李子奇 张熙胤 刘彪 |
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| 作者单位： | （1.兰州交通大学 土木工程学院，甘肃 兰州 730070；2.兰州交通大学 甘肃省道路桥梁与地下工程重点实验室，甘肃 兰州 730070） |
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| 基金项目： | * 基金项目: 国家自然科学基金项目（52068045）;甘肃省自然科学基金项目（20JR10RA237）;兰州交通大学甘肃省重点实验室开放课题项目（2022055）；中央引导地方科技发展资金项目（22ZY1QA005） |
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| 摘 要： | 为研究温度对板式橡胶支座连续梁桥抗震性能的影响，以1座两联3×30 m的预应力混凝土连续箱梁为对象，考虑极端温度对桥墩本构关系和橡胶支座力学特性的影响，运用MIDAS/Civil有限元软件对桥梁地震响应进行研究。通过对地震作用时不同温度工况下桥墩墩底弯矩、墩顶位移和支座位移的地震响应分析，得到极端温度对板式橡胶支座连续梁桥地震响应的影响规律。研究结果表明:与常温工况相比，极端温度引起支座刚度、桥墩混凝土材料参数的改变，使地震作用下极端低温工况桥墩内力和位移响应最大增大35.65%和24.78%，极端高温状态支座位移最大增大15.31%；温度变化对橡胶支座力学参数的影响会导致桥墩和上部结构连接刚度发生改变，导致桥墩和支座地震响应变化显著，使桥墩内力和位移响应均与温度呈负相关，支座位移与温度呈正相关；根据现行规范计算的极端低温时桥墩墩底弯矩偏小，极端高温时桥墩弯矩偏大，设计中应予重视；极端低温导致支座和桥墩刚度增大，会使交接墩地震响应较其他桥墩更显著，在设计中应着重关注。
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| 关 键 词： | 极端温度 板式橡胶支座 摩擦滑移 连续梁桥 地震响应 |
Study on influence of extreme temperature on seismic response of continuous girder bridge with laminated rubber bearing |
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| DU Xinlong,YU Lusong,WANG Li,LI Ziqi,ZHANG Xiyin,LIU Biao.Study on influence of extreme temperature on seismic response of continuous girder bridge with laminated rubber bearing[J].Journal of Safety Science and Technology,2022,18(10):210-215. |
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| Authors: | DU Xinlong YU Lusong WANG Li LI Ziqi ZHANG Xiyin LIU Biao |
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| Affiliation: | (1.School of Civil Engineering,Lanzhou Jiaotong University,Lanzhou Gansu 730070,China;2.Key Laboratory of Road & Bridge and Underground Engineering of Gansu Province,Lanzhou Jiaotong University,Lanzhou Gansu 730070,China) |
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| Abstract: | In order to study the influence of temperature on the seismic performance of continuous girder bridge with laminated rubber bearing,taking a two connected (3×30m ) prestressed concrete continuous box girder as the object,the seismic performance of the bridge was studied by using MIDAS/Civil finite element software considering the influence of extreme temperature on the constitutive relationship of pier and the mechanical properties of rubber bearing.Through the seismic response analysis of pier bottom bending moment,pier top displacement and bearing displacement under different temperature conditions during earthquake,the influence law of extreme temperature on the seismic response of continuous girder bridge with laminated rubber bearing was obtained.The results showed that compared with the normal temperature condition,the extreme temperature caused the change of bearing stiffness and pier concrete material parameters,which maximum increased the internal force and displacement response of pier under the extreme low temperature condition during earthquake by 35.65% and 24.78% respectively,and the bearing displacement under the extreme high temperature condition by 15.31%.The influence of temperature change on the mechanical parameters of rubber bearing would change the connection stiffness of pier and superstructure,resulting in significant change in the seismic response of pier and bearing,so that both the internal force and displacement response of pier were negatively correlated with temperature,and the bearing displacement was positively correlated with temperature.According to the current code,the calculated bending moment at the bottom of pier was too small at extreme low temperature and too large at extreme high temperature,which should be paid attention in the design.The extreme low temperature would increase the stiffness of bearings and piers,and make the seismic response of connecting piers more significant than other piers,which should be paid more attention in the design. |
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| Keywords: | extreme temperature laminated rubber bearing friction sliding continuous girder bridge seismic response |
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