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全美现在共有597479座桥梁。绝大多数桥梁都是在两次桥梁建设大潮中建起来的,一次是在经济大萧条之后,另一次是在州际公路大规模建设时期。因此许多桥梁都已经有40~70年的使用期了,逐渐开始达到它们的使用寿命。从2006年12月联邦公路管理署的NBI数据可知,其中有73798座桥梁(占桥梁总数的12.5%)被认定为具有结构缺陷。另外有80317座桥梁被列为功能老化桥梁。本文针对这些结构缺陷的桥梁进行讨论。
The United States now has a total of 597 479 bridges. Most of the bridges were built during the two major tide of bridge construction, one after the Great Recession and the other during the large-scale construction of the interstate highway. As a result, many bridges have been in use for 40 to 70 years, gradually beginning to reach their useful life. According to the Federal Highway Administration’s NBI data in December 2006, 77,398 bridges (12.5% of the total number of bridges) were identified as structural defects. Another 80,317 bridges are listed as functional aging bridges. This article addresses these structural defects of the bridge.