| 多维地震下考虑桩-土相互作用的曲线桥地震响应分析 |
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| 引用本文： | 程麦理,李盛斌,杨红霞,韩春.多维地震下考虑桩-土相互作用的曲线桥地震响应分析[J].西北地震学报,2019,41(4):866-872. |
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| 作者姓名： | 程麦理 李盛斌 杨红霞 韩春 |
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| 作者单位： | 延安大学 建筑工程学院, 陕西 延安 716000,延安大学 建筑工程学院, 陕西 延安 716000,延安大学 建筑工程学院, 陕西 延安 716000,新乡学院 土木工程与建筑学院, 河南 新乡 453000 |
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| 基金项目： | 国家自然科学基金项目（51808479）；陕西省自然科学基础研究项目（2018JQ5217）；陕西省教育厅专项科研项目（17JK0859）；延安大学科研计划项目（YDY2017-11）；延安大学博士科研起动项目（YDBK2016-8）；河南重点研发与推广专项（182102310806） |
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| 摘 要： | 为研究曲线桥梁在多维地震激励下考虑桩-土动力相互作用的地震响应特性,本文建立了空间桩-土脱离、摩阻和土体压缩非线性理论分析模型。为简化计算将该非线性弹簧模型进行线性化处理,结合有限元ANSYS分析平台建立了黄土场地的曲线桥仿真分析模型,对考虑桩-土相互作用的曲线桥进行了多维多工况数值分析,对比研究了曲线主梁跨中弯矩、墩底剪力和弯矩及桥墩顶位移的地震响应。结果表明:考虑桩-土相互作用的曲线桥梁主梁跨中内力与地震波输入方向密切相关,三维地震作用下主梁内力最大;各工况地震荷载作用下桥墩底部径向剪力响应比切向剪力响应大很多,而桥墩径向弯矩比切向弯矩略小;同一工况下不同桥墩顶切向位移响应大小相当,而径向位移差异较大。在进行非规则曲线桥梁抗震设计时,应充分考虑多维和单维地震激励输入工况。
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| 关 键 词： | 多维地震 桩-土作用 曲线桥 地震响应 |
| 收稿时间： | 2018/9/13 0:00:00 |
Seismic Response Analysis of Curved Bridges Considering Pile-Soil Interaction under Multi-dimensional Earthquakes |
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| CHENG Maili,LI Shengbin,YANG Hongxia and HAN Chun.Seismic Response Analysis of Curved Bridges Considering Pile-Soil Interaction under Multi-dimensional Earthquakes[J].Northwestern Seismological Journal,2019,41(4):866-872. |
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| Authors: | CHENG Maili LI Shengbin YANG Hongxia and HAN Chun |
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| Institution: | School of Architecture and Civil Engineering, Yan''an University, Yan''an 716000, Shaanxi, China,School of Architecture and Civil Engineering, Yan''an University, Yan''an 716000, Shaanxi, China,School of Architecture and Civil Engineering, Yan''an University, Yan''an 716000, Shaanxi, China and School of Civil Engineeing and Architecture, Xinxiang University, Xinxiang 453000, Henan, China |
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| Abstract: | To study the seismic response characteristics of curved bridges considering the pile-soil dynamic interaction under a multi-dimensional seismic excitation, a nonlinear theoretical analysis model of pile-soil interaction was established in this paper. To simplify the calculation process, the nonlinear spring model was linearized, and a simulation model of curved bridges on a loess site was established based on the finite element ANSYS analysis platform. A multi-dimensional and multi-condition numerical analysis of curved bridges, in the context of pile-soil interaction, was carried out. Analysis included the seismic response of the midspan bending moment of curved girder, the shear force and bending moment at the bottom of the pier, and the displacement at the top of the pier. The results showed that the midspan internal force of the main girder of the curved bridge, under given pile-soil interaction, was closely related to the direction of seismic wave input, and the internal force of the girder was the largest under three-dimensional seismic action. The radial shear force response at the bottom of the bridge pier was much larger than the tangential shear force response under the seismic load, while the radial bending moment of the bridge pier was slightly smaller than the tangential bending moment. Under the same loading condition, the top tangential displacement responses of different piers were the same, while the radial displacements were quite different. In the seismic design of irregular curved bridges, the input conditions of multi-dimensional and single-dimensional seismic excitation should be fully considered. |
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| Keywords: | multi-dimensional earthquake pile-soil interaction curved bridges seismic response |
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