桥梁在运营过程中结构材质和性能会随着时间退化,进而导致桥梁的承载能力发生改变.以寿命期内大跨径PC斜拉桥为例,首先运用折减系数法,依据桥梁详尽的外观及无损检测结果并结合实测动力参数,确定了各项检算系数,然后通过初始理论值的折减与修正对该桥的承载能力进行了评定,避免了荷载试验耗时费力、中断交通的缺点,可为同类型桥梁的承载能力评定提供参考.%As the quality and performance of bridge structure material degenerated over the time, the bearing capaci-ty of the bridge would be changed. This paper, taking a long-span PC cable-stayed bridge in working life as a case, firstly identifies the inspecting calculation coefficient by the reduction coefficient method on the basis of detailed ex-terior and non-destructive detection results of the bridge with the measured dynamic parameters. Secondly, the bear-ing capacity of the bridge was assessed by reduction and correction the initial theoretical value. This avoids the load-ing tests which is time-consuming and effortlessly, traffic interruption, providing a reference for the bearing capacity assessment of the same type bridge.
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