Shakedown and dynamic behaviour of masonry arch railway bridges
Shakedown and dynamic behaviour of masonry arch railway bridges
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砌体拱铁路桥的安定与动力性能
DOI：
10.1016/j.engstruct.2020.111474
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发表时间：
2021
影响因子：
5.5
通讯作者：
Forgács T
中科院分区：
文献类型：
--
作者：
Forgács T
马斯图里亚斯拱桥是我们铁路基础设施网络的一个组成部分，它们的安全对我们社会的运作至关重要。虽然，已经有一些研究，以了解在服务条件的圬工拱桥，这些主要集中在静态分析。然而，众所周知，移动的车辆在通过桥梁时会对桥梁施加动态力。本文研究了铁路砌石拱桥在交通荷载条件下的安定性和动力性能。建立了一个非线性离散-有限元混合数值模型，研究了某圬工拱桥的静动力响应。砌体拱的每个楔土由不同的块表示，而砂浆接缝被建模为零厚度界面，其可以根据施加到它们的应力的大小和方向打开和关闭。对移动交通荷载的影响进行了静态和真实的动态分析。此外，对列车与桥梁的相互作用进行了调查，并估计了动力放大系数（DAF）。结果表明，当外荷载通过桥梁时，拱筒内存在塑性变形和残余应力。此外，动态放大取决于外部负载的大小。随着荷载的增加，结构的非线性变得明显，从而降低了桥梁的固有频率。因此，临界速度正在下降。这里提供的观察揭示了新的见解砌体拱桥的剩余和承载能力。
Masonry arch bridges form an integral part of our rail infrastructure network and their safety is important for the functioning of our society. Although, there have been several studies to understand the in-service condition of masonry arch bridges, these are mainly focusing on static analyses. However, it is well known that moving vehicles exert a dynamic force on bridges as they cross them. This paper investigates the shakedown and dynamic behaviour of railway masonry arch bridges under traffic load conditions. A nonlinear, mixed discrete-finite element numerical model was developed to investigate static and dynamic response on a masonry arch bridge. Each voussoir of the masonry arch was represented by a distinct block, while the mortar joints were modelled as zero thickness interfaces which can open and close depending on the magnitude and direction of the stresses applied to them. Both static and real dynamic analyses were carried out investigate the effects of moving traffic loads. In addition, investigations into the train to bridge interaction were undertaken and the dynamic amplification factors (DAFs) were estimated. From the evaluation of the results, it was shown that as the external load passes through the bridge, plastic deformations and residual stresses exist in the arch barrel. Also, the dynamic amplification depends on the magnitude of the external load. As the load increases, non-linearity in the structure is evident, which decreases the natural frequency of the bridge. Hence the critical speed is decreasing. Observations provided here reveal new insight into the residual and load carrying capacity of masonry arch bridges.
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