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何立翔, 谢兴坤, 任伟新.空间多点地震激励下简支梁桥碰撞响应数值模拟[J].陆军工程大学,2023,(5):68-75
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| 空间多点地震激励下简支梁桥碰撞响应数值模拟 |
| 何立翔,谢兴坤,任伟新 |
| (1.陆军工程大学 野战工程学院，江苏 南京 210007;2.深圳大学 土木与交通工程学院，广东 深圳 518060) |
| 摘要:为研究桥梁结构在空间多点地震激励下的碰撞响应，采用LS-DYNA建立了两跨简支梁桥三维精细化有限元模型，考虑了相邻桥跨之间面-面碰撞及偏心碰撞效应，计入了板式橡胶支座系统的非线性、钢筋混凝土在碰撞荷载作用下的材料非线性和应变率效应，详细分析了空间多点地震下桥梁上部结构的碰撞响应，研究了双向多点地震激励及局部场地效应对碰撞响应的影响。研究结果表明，碰撞会导致伸缩缝处桥梁上部结构的局部破坏；双向多点地震激励引起的桥梁偏心碰撞响应导致碰撞次数增加，但减小了碰撞力；局部场地效应对桥梁上部结构碰撞响应影响较大，基础场地条件越差，上部结构碰撞响应越大，碰撞引起的梁端局部破坏越严重。 |
| 关键词: 碰撞响应 多点激励 面-面碰撞 局部场地效应 三维有限元分析 |
| DOI：10.12018/j.issn.2097-0730.20220823001 |
| 投稿时间：2022-08-23 |
| 基金项目:国家自然科学基金（52208222，51278163）；江苏省自然科学基金（BK20221529） |
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| Numerical Simulation of Pounding Response of Simply-Supported Bridges Subjected to Spatially Varying Ground Motions |
| HE Lixiang, XIE Xingkun, REN Weixin |
| (1.College of Field Engineering，Army Engineering University of PLA，Nanjing 210007，China;2.College of Civil and Transportation Engineering，Shenzhen University，Shenzhen 518060，China) |
| Abstract: To investigate the pounding response of bridge structures subjected to spatially varying ground motions, the detailed 3D finite element model of a typical two-span simply-supported bridge was constructed using the finite element software LS-DYNA. The bridge model was constructed while taking into account the following factors, such as the surface-to-surface and eccentric pounding responses between adjacent bridge segments at the expansion joint, the non-linear behavior of the laminated rubber bearings and the non-linear material behavior including the strain rate effects of concrete and steel rebar. The pounding responses of the bridge superstructure under multi-component spatially varying earthquakes were investigated in detail. The effects of spatially varying bi-directional excitations and local site conditions on the pounding response were studied. The numerical results demonstrate that pounding may induce the serious local damages of the girders around the joints; the eccentric pounding response induced by the spatially varying bi-directional ground motions leads to the increasing of the pounding times whiel the decreasing of the pounding force; local site conditions have a significant influence on the pounding responses of the bridge superstructures; the worse site condition will lead to the larger pounding responses between bridge superstructures and the more serious local pounding damages to the end of the bridge girders. |
| Key words: pounding response spatially varying ground motions surface-to-surface pounding local site effect three-dimensional finite element analysis |
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