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中国县乡公路有很多在役旧石拱桥,由于建设年代久远,很多桥梁没有资料留存,给桥梁的养护管理造成很大问题。另一方面由于地方经济发展常需要在县乡公路运输大型设备,这些桥梁可能临时要求通过超重超限车辆,需对这些桥梁进行快速承载能力评估。该文介绍了根据既有交通荷载资料进行旧桥通过超重车辆可能性评估的实例,通过将超重车辆荷载效应与既有交通荷载效应的相互对比,得到桥梁能够通过超重车辆的结论。
There are many in-service old stone arch bridges in China’s county and township roads. Due to the long history of construction, many bridges have no data left, which poses a great problem for the maintenance and management of bridges. On the other hand, due to the local economic development, it is often necessary to transport large-scale equipment on the county and township roads. These bridges may temporarily require the passing of overweight and overloaded vehicles, and the carrying capacity of these bridges needs to be assessed rapidly. This paper presents an example of evaluating the possibility of overpassing old vehicles based on the existing traffic load data. By comparing the overloaded vehicle load effect with the existing traffic load effect, the conclusion is obtained that the bridge can pass the overloaded vehicle.