双层桁梁钢桥面板疲劳细节应力强度因子分析  

Stress intensity factor analysis of steel bridge deck fatigue details of double-deck truss bridge

作　　者：宋煜阳 Song Yuyang(Broadvision Engineering Consultants,Kunming Yunnan 650041,China)

机构地区：[1]云南省交通规划设计研究院股份有限公司,云南昆明650041

出　　处：《山西建筑》2024年第13期185-188,共4页Shanxi Architecture

摘　　要：双层桁梁的U肋-横梁及U肋-顶板焊接构造是钢桥面板典型疲劳细节,采用双面焊的U肋-顶板构造由于其优越的性能受到青睐。为探究双层桁梁两类细节的疲劳性能,通过建立双层桁梁多尺度有限元模型,基于线弹性断裂力学理论,运用扩展有限元法,进行裂纹前缘的应力强度因子分析。研究结果表明,U肋-横梁焊接细节与顶板-U肋双面焊外侧细节等效应变力强度因子幅均超过疲劳开裂门槛值,而顶板-U肋双面焊内侧细节未超过疲劳开裂门槛值,其中U肋-横梁焊接构造细节更不利。The U-rib-rossbeam and U-rib-to-deck welding structures of double-deck truss girders are typical fatigue details of steel bridge decks.The U-rib-to-deck structure with double-sided welding is popular because of its superior performance.In order to explore the fatigue performance of two kinds of details of double-deck truss girder,a multi-scale finite element model of double-deck truss girder is established.Based on the theory of linear elastic fracture mechanics,the Stress Intensity Factor(SIF)analysis of crack front edge is carried out by using the extended finite element method.The results show that the equivalent SIF amplitude of U-rib-to-crossbeam details and the outer welding details of the U-rib-to-deck exceeds the fatigue cracking threshold value,while the inner welding details of the one don’t exceed the fatigue cracking threshold value,and the fatigue issue of U-rib-beam welding details are the most severe.

关 键 词：应力强度因子 钢桥疲劳 扩展有限元 断裂力学 

分 类 号：TU501[建筑科学—建筑技术科学]