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美国约有35万座以上公路和铁路钢桥,在长期使用中,大部分安全可靠,只有少数发生了疲劳破坏事故。通过对事故的分析和对焊接钢梁疲劳性能的试验研究,提出了疲劳设计理论上的新概念,使钢梁疲劳设计条文在本质上起了变化。本文主要介绍美国各州公路和运输工作者协会(简称 AASHTO)新制定的疲劳设计曲线和对疲劳性能研究的一些重要资料。
There are about 350,000 highways and railroad steel bridges in the United States. Most of them are safe and reliable in long-term use, and only a few have suffered fatigue damage accidents. Based on the analysis of the accident and the experimental study of the fatigue behavior of the welded steel beam, a new concept of fatigue design theory was put forward, which made the fatigue design provisions of the steel beam change in essence. This article mainly introduces the fatigue design curve newly developed by the Association of State Highway and Transport Workers (AASHTO) in the United States and some important data on fatigue performance.