基于S-N曲线的钢桥疲劳寿命研究  

Fatigue life Research of Steel Bridge Based on S-N Curve

作　　者：姜天华[1] 杨云锋[1] 艾丽[1] JIANG Tianhua YANG Yunfeng AI Li(College of Urban Construction, Wuhan University of Science and Technology, Wuhan, Hubei 430065, Chin)

机构地区：[1]武汉科技大学城市建设学院,湖北武汉430065

出　　处：《公路工程》2017年第1期52-54,59,共4页Highway Engineering

基　　金：国家自然科学基金资助项目(51278391);湖北省自然科学基金项目(2014CFB823)

摘　　要：针对我国《铁路桥梁钢结构设计规范》中关于钢桥疲劳寿命评估方法存在的不足,提出了考虑多车效应和冲击效应作用下疲劳车辆模型的确定方法。通过比较英国BS5400规范和美国AASHTO规范中关于S—N曲线的修正方法,得到了变幅疲劳荷载作用下S-N曲线的修正方法,并通过工程实例验证了在考虑多车效应和冲击效应作用时,采用该修正方法计算得出的疲劳寿命更加合理。For the insufficiency of fatigue life assessment of steel bridge in code for design of steel structure for railway bridges, a meihod of determining fatigue vehicle model that taken the multi-vehicle effect and impact effect into consideration was presented. Compared the British BS5400 specifications with American AASHTO specifications on SN curve correction method, we proposed a correction method of the S-N curve subjected to variable amplitude fatigue load. And through the engineering examples, it can be concluded that when considering multi-vehicle effect and impact effect, using this correction meth- od is more reasonable for calculation of the fatigue life.

关 键 词：疲劳寿命 多车效应 冲击效应 S—N曲线 变幅疲劳荷载 

分 类 号：U441.4[建筑科学—桥梁与隧道工程]