钢桥面横膈膜切孔结构混合模态疲劳裂纹扩展机理

IABSE Congress, Nanjing 2022: Bridges and Structures: Connection, Integration and Harmonisation Pub Date : 1900-01-01 DOI:10.2749/nanjing.2022.1969

L. Yu, Hui Chen, Chenhui Zhu, Y. Mao, Chun-sheng Wang

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引用次数: 0

摘要

基于扩展有限元法(XFEM)，建立了典型钢桥面的有限元模型，分析了膜片切割细部的疲劳裂纹扩展。在疲劳机理分析中考虑了焊接残余应力、车辆荷载和初始裂纹等参数。计算了两种切口膜片切口边缘的残余拉应力。具有较高残余拉应力的切口为疲劳裂纹扩展计算提供了焊接残余应力场。在车辆荷载和焊接残余场的耦合作用下，膜片切口边缘的疲劳裂纹为ⅰ、ⅱ型混合裂纹，且以ⅰ型裂纹为主。

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Mixed Mode Fatigue Crack Propagation Mechanism of the Diaphragm Cutout Detail in Steel Bridge Deck

Based on the extended finite element method (XFEM), finite element model of a typical steel bridge deck was established to analyze the fatigue crack propagation of diaphragm cutout detail. It was considered the parameters of welding residual stress, vehicle load and initial crack in the fatigue mechanism analysis. Residual tensile stress in the cutout edge of the diaphragm of two types of cutout was calculated. Cutout with higher residual tensile stress provided the welding residual stress field for calculation of fatigue crack propagation. Under coupling action of vehicle load and welding residual field, the fatigue crack in diaphragm cutout edge was mixed mode crack of Modes I, II, dominated by Mode I.

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IABSE Congress, Nanjing 2022: Bridges and Structures: Connection, Integration and Harmonisation

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