正交异性桥面板典型焊接接头应力强度因子修正公式

正交异性桥面板应用广泛,其焊接接头的疲劳破坏是导致桥面板结构失效最主要的原因。采用断裂力学的方法评价正交异性桥面板典型焊接接头的疲劳性能是工程领域主要的研究方法,但已有的应力强度因子公式存在精度不高、疲劳寿命预测不准等问题。以Baik等学者提出的应力强度因子公式为基础,修正了原有公式的物理概念;并通过回归有限元模型中的数据,得到了修正的应力强度因子计算公式。经与现有试验研究结果的比较,验证了修正公式在焊接接头疲劳寿命预测上的可靠性;并证明了其在正交异性桥面板工程中的应用价值。

Improved Formulae of Stress Intensity Factor ForTypical Welded Joints in Orthotropic Steel Decks

Orthotropic steel decks are widely used nowadays, and the fatigue failure of the welded joint is the main reason for the failure of the panel structure. In practical engineering, the linear elastic fracture mechanics method is used to evaluate the fatigue performance of typical welded joints, but the existing formulae of stress intensity factor are of low accuracy for both stress intensity factor calculation and the fatigue life prediction. Based on the formulae proposed by Baik etal, the physical meanings of the former equation are modified and the improved formulae for stress intensity factor calculation are proposed by the finite element data regression. Though comparing with the experimental results, The reliability of the modified formulae used on the fatigue life prediction of welded joints is verified, and the theoretical value of the modified formulae in practical engineering application is proved.