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在概率论的前提下,运用线弹性断裂力学的方法研究高速公路桥钢梁在地震荷载作用下的疲劳特性。第一部分介绍的疲劳破坏是由经过桥面的重型卡车的车辆荷载引起;第二部分介绍的疲劳破坏由地震荷载引起。两种类型的破坏都使用线弹性断裂力学方法进行分析,并计算了最初裂缝发展的时间。考虑到在桥梁的使用年限里通常不同时考虑疲劳效应和地震效应,提出的方法能更好地理解桥梁由疲劳引起的逐渐破坏现象,并对如何延长地震区众多钢桥梁的疲劳寿命提出一些建议。
Under the premise of probability theory, the fatigue characteristics of expressway bridge steel girder subjected to earthquake load are studied by means of linear elastic fracture mechanics. The fatigue damage introduced in the first part is caused by the vehicle’s load on the heavy truck passing the bridge deck. The fatigue damage introduced in the second part is caused by the seismic load. Both types of damage were analyzed using the linear elastic fracture mechanics method and the time to initial fracture development was calculated. Considering that the fatigue effect and the seismic effect are usually not considered simultaneously in the service life of the bridge, the proposed method can better understand the gradual failure of the bridge caused by fatigue and make some suggestions on how to prolong the fatigue life of many steel bridges in the earthquake area .