Experimental investigation of the residual behaviour of damaged masonry arch structures
Experimental investigation of the residual behaviour of damaged masonry arch structures
复制标题
受损砌体拱结构残余性能试验研究
DOI：
10.1016/j.istruc.2020.08.008
复制
发表时间：
2020
期刊：
影响因子：
4.1
通讯作者：
Augusthus-Nelson L
中科院分区：
文献类型：
--
作者：
Augusthus-Nelson L
新的砖石拱桥很少作为现代交通网络的一部分建造，但由于其整体弹性，它们仍然是现代民用基础设施的组成部分。这种弹性导致了极长的使用寿命，这反过来又导致了大多数仍在使用的桥梁被扭曲或损坏。桥梁业主团体的兴趣是延长这些结构的使用寿命，而不是更换新的桥梁。本文的目的是探讨是否可以可靠地确定剩余强度和使用寿命，以及是否必须根据条件评估施加荷载限制，和/或改造砌体拱系统以延长这些重要结构的使用寿命。为了调查剩余强度和安全工作载荷，大规模，在受控的实验室环境中，建造了回填土的圬工拱，并随后进行了一系列的加载方案。失效后，这些结构进行了进一步测试，使用循环和准静态载荷。结果表明：在安全工作荷载水平下的反复循环荷载不会显著改变原始圬工拱结构的极限承载能力;变形和/或受损拱结构的剩余强度可能很大;当在安全工作荷载水平下承受反复循环荷载时，变形和/或损坏的桥梁在一定程度上能够愈合，而未使用过的拱则不是这种情况。基于这些发现，可以得出结论，变形和/或损坏的砌体拱结构的安全工作载荷和寿命必须结合砌体拱结构的当前状态来确定。
New masonry arch bridges are rarely constructed as part of modern transport networks, however they continue to remain an integral part of modern civil infrastructure due to their overall resilience. This resilience has led to extremely long service lives which in turn has led to the majority of those bridges still in service being either distorted or damaged. Interest in the bridge owners community is directed towards prolonging the service life of these structures rather than replacement with new bridges. The aim of this paper is to explore whether the residual strength and the service life can be reliably established, and whether load limits must be imposed based on condition-based assessment, and/or retrofit the masonry arch system to prolong the life span of these important structures.To investigate residual strength and safe working loads, large scale, soil-backfilled masonry arches were constructed and subsequently subjected to a range of loading scenarios in controlled laboratory environments. Post-failure, these structures were further tested using both cyclic and quasi-static loadings. Results shows that: repeated cyclic loading at safe working load levels do not significantly alter the ultimate load carrying capacity of virgin masonry arch structures; the residual strength of distorted and/or damaged arch structures can be significant; distorted and/or damaged bridges are to some extent able to heal when subjected to repeated cyclic loading at safe working load levels, which is not the case with a virgin arch. Based on these findings, it can be concluded that the safe working load and life span of distorted and/or damaged masonry arch structures must be established in conjunction with the current state of the masonry arch structure.
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DOI：
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发表时间：
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期刊：
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