西南交通大学学报2017，Vol.52Issue(1)：16-22,7.DOI:10.3969/j.issn.0258-2724.2017.01.003
基于断裂力学的钢桥面肋-板接头疲劳寿命预测
Fatigue Life Prediction on Rib-to-Deck Welded Joints of Steel Bridge Deck Based on LEFM
摘要
Abstract
In order to explore the fatigue performance of U-shaped fib-to-deck welded joints of orthotropic steel bridge deck under cyclic loading,based on linear elastic fracture mechanics (LEFM),fatigue life evaluation was carried out using finite element method (FEM).According to the structure features of rib-to-deck welded joints of orthotropic steel bridge deck,2D FEM model with 3 U-shaped fibs was built using ANSYS software.Presetting 4 kinds of initial cracks for weld detail,the equivalent stress intensity factors (ESIF) at each crack with 2 loading cases were calculated.The relationship between stress intensity factor and influential parameters,including initial cracks length,thickness of deck plate,height and thickness of U-shaped rib,was analyzed.In accordance with weld detail category of orthotropic steel bridge deck in Eurocode 3,ESIF at every crack were obtained,and fatigue life prediction method of weld joint of orthotropic steel deck were proposed based on fatigue crack propagation model in LEFM theory.Results show that fatigue life calculated with LEFM is greater than the value in Eurocode 3,and fatigue life of the welded joint will be enhanced when the deck plate thickness is 16-18 mm and initial crack length is less than 0.1 mm.关键词
正交异性钢桥面/焊接细节/疲劳寿命/断裂力学/应力强度因子Key words
orthotropic steel deck/weld detail/fatigue life/LEFM/SIF分类
交通工程引用本文复制引用
卫星,姜苏..基于断裂力学的钢桥面肋-板接头疲劳寿命预测[J].西南交通大学学报,2017,52(1):16-22,7.基金项目
国家自然科学基金资助项目(51378431) （51378431）
