基于热点应力法的正交异性钢桥面板疲劳寿命评估

发布时间：2018-04-10 01:06

本文选题：正交异性钢桥面板　切入点：疲劳性能　出处：《桥梁建设》2014年04期

【摘要】：正交异性钢桥面板构造复杂,其疲劳性能由各疲劳细节共同决定,既有规范推荐的寿命评估方法已不能满足设计要求。为准确评估其疲劳寿命,引入热点应力法,根据Eurocode规范确定疲劳检算加载工况和荷载谱;采用国际焊接协会IIW推荐的外推方法,计算其关键易损部位热点应力谱;采用泄水法对热点应力谱进行分析,通过热点应力S~N曲线和线性累积损伤理论计算其寿命。以某城市立交桥典型正交异性钢桥面板为研究对象,采用热点应力法评估其疲劳寿命。结果表明:该桥的疲劳寿命为103年,满足设计要求且有一定安全储备量;与名义应力法相比,热点应力法能够有效避免复杂应力状态下名义应力难以定义的问题,更适用于正交异性钢桥面板的寿命评估。
[Abstract]:The fatigue performance of orthotropic steel bridge panel is complex and its fatigue performance is determined by various fatigue details. The life evaluation methods recommended by the existing codes can no longer meet the design requirements.In order to evaluate its fatigue life accurately, the hot spot stress method is introduced to determine the loading condition and load spectrum according to the Eurocode code, the extrapolation method recommended by IIW of the International Welding Association is used to calculate the hot spot stress spectrum of the key vulnerable parts.The stress spectrum of hot spots is analyzed by water discharge method, and its life is calculated by Sn-curve of hot spot stress and linear cumulative damage theory.The fatigue life of a typical orthotropic steel bridge face slab of a city overpass is evaluated by hot spot stress method.The results show that the fatigue life of the bridge is 103 years, which meets the design requirements and has a certain amount of safety reserves. Compared with the nominal stress method, the hot spot stress method can effectively avoid the problem that the nominal stress is difficult to define under the complex stress state.More suitable for orthotropic steel bridge panel life evaluation.
【作者单位】：西南交通大学;中铁大桥局集团桥科院有限公司;
【基金】：国家科技支撑计划项目(2011BAG07B03) 中央高校基本科研业务费专项资金项目(2682014CX078)~~
【分类号】：U443.31

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