Some problems with arch bridge assessment and potential solutions
Some problems with arch bridge assessment and potential solutions
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拱桥评估中的一些问题及解决办法
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发表时间：
2006
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通讯作者：
B. Harvey
中科院分区：
文献类型：
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作者：
B. Harvey
概述了拱桥评估的历史沿革。为了在经济上可行，进行了二维分析，并使用了一套经验推导的规则来定义第三维的影响。最常用的是由Pippard开发的Mexe方法。针对一组突然遭遇大流量交通的桥梁进行了实地研究，考虑了拱桥评估方法的局限性。这些桥梁是使用全站仪进行测量的，全站仪能够直接测量石桥的距离。这表明在拱门主体和拱檐墙下的部分之间存在纵向裂缝。检查了列车通过时拱顶的挠度。当列车接近桥梁时，路堤上的荷载将桥台向前推，然后桥梁上的荷载导致拱形向下挠度。概述了1985-1995年进行的现场试验对拱桥评估程序的限制。考虑了在小型桥梁中基于风扇分布的模型的可能性。尽管现行的评估规则表明，自重较低的拱桥是安全的，但它们可能容易受到交通破坏的影响。
The history of arch bridge assessment is outlined. In order to be economically viable, two dimensional analyses are conducted and a set of empirically derived rules are used to define the effects of the third dimension. The MEXE method, developed by Pippard, is commonly used. The limitations of the methods used for arch bridge assessment are considered with respect to field studies for a group of bridges that were suddenly subjected to much heavier traffic. The bridges were surveyed using a Total Station capable of measuring distance directly off the stonework. This showed the presence of a longitudinal crack between the bulk of the arch and the section under the spandrel wall. Deflection at the crown of the arch as a train passes over was examined. As the train approached the bridge, load on the embankment pushes the abutment forward and then load on the bridge caused downward deflection of the arch. The limitations of field tests conducted in 1985-1995 on assessment procedures for arch bridges are outlined. The potential for a model based on fan distribution in small bridges is considered. It is concluded that arches with a low dead load may be susceptible to traffic damage, although current assessment rules indicate that they are safe.