| 地震作用下曲线梁桥双向碰撞作用影响分析 |
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| 引用本文： | 王强,吴刚.地震作用下曲线梁桥双向碰撞作用影响分析[J].世界地震工程,2020,0(2):121-128. |
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| 作者姓名： | 王强 吴刚 |
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| 作者单位： | 青海交通职业技术学院,青海西宁810000;华东交通大学土木建筑学院,江西南昌330013 |
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| 基金项目： | 江西省青年科学基金项目(20192BAB216032)。 |
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| 摘 要： | 碰撞作用直接影响到桥梁不同构件的地震响应,是桥梁抗震研究中一直关注的问题。针对地震作用下曲线梁桥因主梁面内转动而发生主梁与切向桥台和径向挡块碰撞的现象,以1座3跨预应力混凝土连续梁桥为例,采用非线性时程分析方法,对曲线连续梁桥的双向碰撞作用影响进行研究,并分析了不同减撞措施的效果。结果表明:考虑双向碰撞作用后,下部结构响应有明显增加,主梁转动现象变得复杂,曲线梁桥地震响应分析中应通过建立精细化模型来考虑主梁双向碰撞作用的影响;在切向桥台处设置限位拉锁装置能起到较好的减轻双向碰撞作用的影响,以及采用减隔震设计后,减撞效果更明显,桥梁抗震性能明显改善,但合理减撞措施设计参数应结合曲线梁桥约束体系及结构设计参数进行体系分析确定。
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| 关 键 词： | 桥梁工程 碰撞作用 地震响应 有限元分析 |
Analysis on the influence of bidirectional collision effect of curved bridges under seismic actions |
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| WANG Qiang,WU Gang.Analysis on the influence of bidirectional collision effect of curved bridges under seismic actions[J].World Information On Earthquake Engineering,2020,0(2):121-128. |
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| Authors: | WANG Qiang WU Gang |
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| Affiliation: | 1. Qinghai Communication Technical College, Xi’ning 810000, China;2. School of Civil Engineering and Architecture, East China Jiaotong University, Nanchang 330013, China |
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| Abstract: | Collision has direct impacts on the seismic response of various components of bridges, and it is a hot research topic on bridges. Aiming at the collision phenomenon of the curved bridge between the main girder and the tangential abutment and the radial shear keys caused by the rotation of the main girder under earthquakes, a three-span prestressed concrete continuous girder bridge is taken as an example in the study. The nonlinear time-history analysis method is used to study the influence of the bidirectional collision effect of the curved bridge. The effects of different collision reduction measures are analyzed. The results show that the seismic response of the substructure increases obviously considering the bidirectional collision effect, and the rotation of the main girder becomes complicated. The influence of bidirectional collision effect should be described by establishing a refinement model in the seismic response analysis of curved bridges. The setting of movement limit devices at the tangential bridge abutment can reduce the bidirectional collision. Adopting a seismic isolation design, the collision is significantly reduced, and the seismic performance of the curved bridge is obviously improved. However, the design parameters of rational collision reduction measures should be determined by a system analysis of the constraint system and structural design parameters of curved bridges. |
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| Keywords: | bridge engineering collision effect seismic response finite element analysis |
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