A finite element model of welding analysis was established to simulate the welding process of rib-to-deck double-sided joints,and an empirical formula for the transverse residual stress distribution along the direction of plate thickness was obtained.The weight functions for the stress intensity factor at the deepest point and surface point of the fatigue crack at the welded toe of the deck were fitted using a unified weight function expression and numerical analysis results from fracture mechanics of steel bridge decks.The stress intensity factors calculated by the weight function were compared with those calculated by finite element analysis.The results show that the residual stress at the weld toe of the rib-to-deck double-sided welded joints exhibits a tension-compression-tension state along the plate thickness direction,and follows a sinusoidal function distribution.Under the secondary stress distribution,the maximum relative error of the stress intensity factor at the deepest point of the crack calculated using the weight function method and the finite element method is 7.4% ,and the maximum relative error of the stress intensity factor at the surface point of the crack is 4.1% .Under the welding residual stress field,the maximum relative error of the stress intensity factor at the deepest point of the crack at the weld toe calculated using the weight function method and the finite element method is 7.6% ,and the maximum relative error of the stress intensity factor at the surface point of the crack is 8.6% .The weight function method can effectively calculate the stress intensity factor of fatigue crack at the welded toe of rib-to-deck double-sided welded joints in orthotropic steel decks.
关键词
正交异性钢桥面板/权函数法/疲劳裂纹/应力强度因子/焊接残余应力
Key words
orthotropic steel deck/weight function method/fatigue crack/stress intensity factor/welding residual stress
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