Dynamic response of a damaged masonry rail viaduct: Measurement and interpretation
Dynamic response of a damaged masonry rail viaduct: Measurement and interpretation
复制标题
受损砖石铁路高架桥的动态响应：测量和解释
DOI：
10.1016/j.engstruct.2018.04.054
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发表时间：
2018
影响因子：
5.5
通讯作者：
Acikgoz S
中科院分区：
文献类型：
--
作者：
Acikgoz S
尽管最近在建模和测试技术方面取得了进展，但评估老化砖石铁路桥的适用性仍然是一个重大挑战。大多数评估方法都是基于极限强度，而缺乏可靠的基于测量的评估标准。本文旨在通过对桥梁进行详细的局部（例如损坏位置）和全局（例如不同部件的相互作用）动态监测，提高对使用性能的了解。准分布式传感技术（光纤光栅电缆和数字图像相关）被用来量化桥梁的动态响应，通过广泛的测量应变和位移。具体来说，这些技术被应用到两个损坏的跨度的沼泽巷高架桥在利兹，英国。详细调查的动态桥墩和拱筒运动揭示了如何响应机制，并可能传播，现有的损害。例如，桥墩在桥梁纵向平面内的旋转会导致大跨度的张开和闭合，进而导致拱座和背拱在桥墩上晃动。这是伴随着弯曲变形的拱，这迫使现有的横向裂缝，以经历高的压缩应变。类似地，由于卸荷拱的存在，桥墩的横向旋转导致卸荷拱的扩展和上部纵向裂缝的张开。这些意见提供了新的见解的行为，并导致改善评估技术的砖石高架桥的建议。
Despite recent advances in modelling and testing techniques, assessing the serviceability of ageing masonry rail bridges remains a significant challenge. Most assessment methods are based on ultimate strength, while reliable measurement-based assessment criteria are lacking. This paper aims to improve the understanding of serviceability behaviour through detailed dynamic monitoring of the bridge locally (e.g. in locations of damage) and globally (e.g. interaction of different components). Quasi distributed sensing techniques (Fibre Bragg Grating cables and Digital Image Correlation) were used to quantify the bridge dynamic response through extensive measurement of strains and displacements. Specifically, these techniques were applied to two damaged spans of the Marsh Lane viaduct in Leeds, UK. A detailed investigation of the dynamic pier and arch barrel movements reveal how the response mechanisms relate to, and likely propagate, the existing damage. For instance, rotation of piers in the bridge longitudinal plane causes significant span opening and closing, which in turn causes the skewbacks and backing to rock on the piers. This is accompanied by flexural deformation of the arch, which forces the existing transverse cracks to experience high compressive strains. Similarly, the transverse rotation of piers due to the presence of the relieving arches causes spreading of the relieving arches and opening of the longitudinal crack above. These observations provide new insight into behaviour and lead to suggestions for improving assessment techniques for masonry viaducts.
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