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Modelling three-dimensional non-linear seismic performance of elevated bridges with emphasis on pounding of girders

机译：高架桥三维非线性抗震性能建模，重点是梁的冲击

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摘要

Unseating of bridge girders/decks during earthquakes is very harmful to the safety and serviceability of bridges. Evidence from recent severe earthquakes indicates that in addition to damage along longitudinal direction, lateral displacement and rotation of bridge girders caused by pounding to adjacent girders can also lead to unseating. To simulate this effect, 3D modelling of the dynamic performance of whole bridge structures, including pounding, is needed strongly. This paper presents a 3D model that is practically suitable to precisely analyse pounding between bridge girders. Experiments have been conducted to verify the proposed pounding model. The 3D non-linear modelling of steel elevated bridges is also discussed. A general-purpose dynamic analysis program for bridges, namely dynamic analysis of bridge systems (DABS) has been developed. Seismic analyses on a chosen three-span steel bridge are conducted for several cases including pounding as a case study. The applicability of the proposed pounding model is illustrated by the computations. The effects of poundings on the response of bridge girders are discussed and the computation results are given.
机译：地震期间，确保桥梁的大梁/甲板保持就位，这对桥梁的安全性和使用性非常有害。最近发生的严重地震的证据表明，除了沿纵向方向的破坏外，由于对相邻大梁的撞击也可能引起桥梁大梁的横向位移和旋转，也可能导致不稳固。为了模拟这种效果，强烈需要对整个桥梁结构的动态性能（包括冲击）进行3D建模。本文提出了一种3D模型，该模型实际上适合于精确分析桥梁大梁之间的碰撞。已经进行实验以验证所提出的冲击模型。还讨论了钢高架桥的3D非线性建模。已经开发了一种通用的桥梁动态分析程序，即桥梁系统动态分析（DABS）。在几种选定的三跨钢桥上进行了地震分析，其中包括敲击作为案例研究。计算结果表明了所提出的冲击模型的适用性。讨论了敲击对桥梁大梁响应的影响，并给出了计算结果。

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