计算力学学报2017，Vol.34Issue(6)：698-703,6.DOI:10.7511/jslx201706004
拉压循环载荷下正交异性钢桥面板肋-面板焊缝裂纹扩展分析
Crack growth analysis of the rib-to-deck welded joints of orthotropic steel deck under cyclic loading with negative stress ratio
摘要
Abstract
A four-step approach is used to numerically analyze the fatigue crack growth of the surface cracks at the rib-to-deck welded joint of an orthotropic steel deck.Firstly,the transverse stress at the ribto-deck welded joint is computed based on the fatigue stress analysis model of orthotropic steel deck.Secondly,the stress intensity factors along the surface crack tips at the joint are evaluated efficiently by using a three-dimensional local model of the joint and Schwartz-Neumann alternating method.Thirdly,the influence of the compressive stress under cyclic loading on the fatigue crack growth is studied by using a two-dimensional fracture mode and a plastic damage model.The last step is to calculate the fatigue crack growth rate of the surface cracks at the rib-to-deck welded joint by substituting the stress intensity factors given in the second step into the fatigue crack growth formulas obtained from the third step.The presented results of the fatigue crack growth rate demonstrate that the reverse plastic zone at the crack tip will accelerate the crack growth rate by more than 50 ％ for the rib-to-deck welded joints of an orthotropic steel deck under the cyclic loading with negative stress ratio.关键词
正交异性钢桥面板/肋-面板焊缝/疲劳裂纹扩展/拉-压循环载荷/压应力影响/裂尖反向塑性区Key words
orthotropic steel bridge deck/rib-to-deck welded joint/fatigue crack growth/cyclic loading with negative stress ratio/compressive stress/reverse plastic zone at crack tip分类
数理科学引用本文复制引用
杜青,石广玉..拉压循环载荷下正交异性钢桥面板肋-面板焊缝裂纹扩展分析[J].计算力学学报,2017,34(6):698-703,6.基金项目
国家自然科学基金项目(NSFC-91230113) （NSFC-91230113）
天津市交通委员会(TJJW-2016A-06)资助项目. （TJJW-2016A-06）
