Q500qENH耐候钢桥面焊接节点疲劳性能研究

兰涛; 田文业; 张晓巍; 李茂贝; 秦广冲; 刘鑫; 李然; 门进杰

doi:10.3724/j.gyjzG25031305

Q500qENH耐候钢桥面焊接节点疲劳性能研究

doi: 10.3724/j.gyjzG25031305

兰涛^1,2,
田文业²,
张晓巍¹,
李茂贝³,
秦广冲^1, ,,
刘鑫¹,
李然¹,
门进杰²

1. 中国船舶集团国际工程有限公司, 北京 100121;
2. 西安建筑科技大学, 西安 710055;
3. 中国能源建设集团陕西省电力设计院有限公司, 西安 710054

基金项目:

“十四五”国家重点研发计划（2022YFB3706400）。

详细信息

作者简介:
兰涛，博士，研究员，主要从事钢结构研究。

通讯作者:
秦广冲，博士，高级工程师，主要从事钢结构研究，qinguangchong@126.com。

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出版历程
- 收稿日期: 2025-03-13
- 网络出版日期: 2025-11-05

Research on the Fatigue Performance of Welded Joints of Q500qENH Weathering Steel Bridge Decks

1. CSSC International Engineering Co., Ltd., Beijing 100121, China;
2. School of Civil Engineering, Xi'an University of Architecture & Technology, Xi'an 710055, China;
3. China Energy Egnineering Group Shaanxi Electric Power Design Institute, Xi'an 710054, China

摘要

摘要: 为研究Q500qENH耐候钢桥面板焊接节点在复杂荷载作用下的疲劳损伤问题，采用ABAQUS-Franc 3D跨平台联合仿真技术模拟裂纹动态扩展过程，重点揭示初始裂纹形态（包含深宽比与角度）、顶板厚度等参数对裂纹扩展的作用机制。数值分析结果表明：车辆荷载作用下，各薄弱节点处应力强度因子呈现显著空间差异性，跨中荷载为最不利荷载工况；裂纹扩展路径受几何约束效应主导，裂纹深宽比在扩展过程中呈现“先增后减”的阶段演化规律，相比宽度，裂纹深度对寿命的影响更显著；初始裂纹尺寸增大导致应力强度因子增幅达18%~35%，裂纹角度为15°时应力强度因子峰值较垂直裂纹提高23%；随着顶板厚度增加，裂纹扩展寿命延长，且延长速率呈非线性增大；随轮载压强的增大，裂纹扩展寿命减小，且减小速率逐渐变缓。
- Q500qENH钢 /
- 焊接节点 /
- 应力强度因子 /
- 有限元分析 /
- 疲劳裂纹扩展
Abstract: To investigate the fatigue damage of welded joints in 500qENH weathering steel bridge decks under complex loading conditions， this study employed ABAQUS-Franc 3D cross-platform collaborative simulation technology to model the dynamic crack propagation process， with a particular emphasis on elucidating the influence mechanisms of initial crack morphology （including depth-to-width ratio and inclination angle） and top-plate thickness on crack evolution. Numerical analysis results demonstrated that under vehicular loading， significant spatial heterogeneity of stress intensity factors （SIFs） was observed at vulnerable joints， with mid-span loading representing the most critical loading scenario. Crack propagation paths were predominantly governed by geometric constraint effects， exhibiting a phased evolution pattern characterized by an initial increase followed a by subsequent decrease in the crack depth-to-width ratio， where crack depth exerted more substantial influence on fatigue life than width dimension. Enlargement of initial crack dimensions elevated SIF amplitudes by 18% to 35%. Inclined cracks at 15° manifested 23% higher peak SIF values compared to vertical cracks. Increased top-plate thickness nonlinearly enhanced crack propagation life with progressively accelerated extension rates. Elevated wheel load pressure induced decelerating reduction rates in crack propagation life.
- Q500qENH steel /
- welded joints /
- stress intensity factor /
- finite element analysis /
- fatigue crack propagation

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参考文献(20)

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