正交异性钢桥面板焊接节点应力集中系数

Hot Spot Stress Concentration Factor for Welded Joints in Steel Orthotropic Decks

摘要:

以千米级斜拉桥苏通大桥为工程背景，建立桥面板纵肋与盖板节点有限元模型，基于国内外现有的几种焊接节点热点应力计算方法，对节点焊缝周围的热点应力和应力集中系数进行数值计算，全面分析单元类型、网格划分对计算结果的影响，并通过将现场实测的应力集中系数与数值分析的相应结果进行比较，从而确立热点应力的有效计算方法，获得了节点焊缝周围的应力分布规律和应力集中系数.最后分析了板件几何参数对热点应力集中的影响.

Abstract:

The finite element models for rib-to-deck joints of Sutong Yangtze River bridge are established,the hot-spot stress along the weld toe and the stress concentration factor at weld toe are studied with several methods for determinig hot-spot stress,and the influence of element type and meshing requirement on computing results are comprehensively analyzed.In order to validate numerical analysis results,the test for stress distribution along the weld toe is carried out.As a result,the effective methods for computing hot-spot are founded,the stress distribution along weld toe and its stress concentration factor are gained.At last,the effect of some geometrical parameters on the stress concentration in the hot spots tress region is investigated.