近断层地震动下高速铁路多跨简支梁桥震致破坏特征

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振动与冲击 ›› 2020, Vol. 39 ›› Issue (17) : 210-218.

论文

国巍1,2，王阳1,2，葛苍瑜1,2,3，高霞1,2,3，宗绍晗 1,2,3，卜丹 4

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Seismic failure features of multi-span simply supported girder bridges of high-speed railway under near-fault earthquake

GUO Wei1, 2, WANG Yang1, 2,3, GE Cangyu1,2,3, GAO Xia1,2,3, ZONG Shaohan1,2,3, BU Dan4

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文章历史 +

摘要

我国高速铁路桥梁设计以行车平顺性作为首要目标，体现为基于刚度的设计，导致桥梁抗震性能和震致破坏特征不明确。基于此，建立了5跨32 m简支梁桥模型，模型包括桥墩、支座、梁体、轨道结构、钢轨等，同时考虑了桥下群桩基础的桩土相互作用和活动支座摩擦力受竖向力变化的影响。以此模型为基础，研究了近断层地震下多跨简支梁桥震致响应，参考构件破坏限值，分析了结构震致破坏特征，指出了高铁简支梁桥在近断层地震动下的破坏部位集中于梁缝处和滑动层，桥墩破坏并不严重，明确在高铁桥梁设计和评估中应关注上部轨道结构等功能部件的抗震性能及破坏特征，轨道结构的破坏可能会导致高铁桥梁功能中断和严重经济损失。

Abstract

Ride comfort is taken as the priority target in the design of high-speed railway bridges in China to be reflected in the stiffness-based design, and cause indeterminacy of bridges’ aseismic performance and seismic failure features. Here, a 5-span 32 m simply supported girder bridge model was built, and it was composed of piers, supports, girders, track structures, rails, etc. considering interaction between piles and soil of pier group foundation under bridge and effects of vertical force on friction of slide supports. Based on this model, seismic responses of a multi-span simply supported girder bridge under near-field earthquake were studied. Combined with the failure limit of each component, seismic failure features of the structure under earthquake are analyzed. Results showed that failure positions of a high-speed railway bridge under near-fault earthquake are concentrated at beam joint and sliding layer, while pier failure is not serious; in design and assessment of high-speed railway bridges, aseismic performance and failure features of functional components, such as, upper track structure should receive much attention, and destruction of track structure may cause the bridge’s function to be interrupted and huge economic loss.

导出引用

国巍1,2，王阳1,2，葛苍瑜1,2,3，高霞1,2,3，宗绍晗 1,2,3，卜丹 4. 近断层地震动下高速铁路多跨简支梁桥震致破坏特征[J]. 振动与冲击, 2020, 39(17): 210-218

GUO Wei1, 2, WANG Yang1, 2,3, GE Cangyu1,2,3, GAO Xia1,2,3, ZONG Shaohan1,2,3, BU Dan4. Seismic failure features of multi-span simply supported girder bridges of high-speed railway under near-fault earthquake[J]. Journal of Vibration and Shock, 2020, 39(17): 210-218

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