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公路桥梁标准规范(1989年版)的第10.3.1和10.3.2条中的疲劳规定,没有准确反应这类桥梁的实际疲劳状态,而是将人为的高应力幅与人为妖循环数结合,以此绘出适当的结果,而实际有效应力幅很少超过5ksl。另一方面,尽管货车通过的总数常常比较少.但桥梁在75年至100年的使用寿命内,货车通过的总数可能超过3亿辆. 本指导性规范给出了一些可供选择的疲劳设计方法,试图用于取代标准规范的第10.3.1条和10.3.2
The fatigue provisions in 10.3.1 and 10.3.2 of the Standards for Highway Bridges Standard (1989 Edition) do not accurately reflect the actual fatigue state of such bridges, but combine the artificial high stress amplitude with the humanoid cycle number to This draws an appropriate result, while the actual effective stress amplitude rarely exceeds 5 kgsl. On the other hand, the total number of trucks passing through the service life of 75 to 100 years may exceed 300 million, although the total number of trucks passing is often relatively small.This guideline gives a few options for fatigue design Method, trying to replace the standard norms 10.3.1 and 10.3.2