Experimental Study on Fatigue Performance of Integral Welded Joints in Steel Truss Bridges

被引：0
|
作者：
Zhang Q.-H. [1 ]
Wei C. [1 ]
Xu Z. [2 ]
Yang C. [1 ]
Zhang C.-Q. [1 ]
Gui C. [1 ]
机构：
[1] Department of Bridge Engineering, Southwest Jiaotong University, Sichuan, Chengdu
[2] Shandong Provincial Communications Planning and Design Institute Group Co. Ltd., Shandong, Jinan
来源：
Zhongguo Gonglu Xuebao/China Journal of Highway and Transport | 2022年 / 35卷 / 12期
基金：
中国国家自然科学基金;
关键词：
bridge engineering; critical details; fatigue performance; integral welded joint; model test; steel truss bridge;
D O I：
10.19721/j.cnki.1001-7372.2022.12.007
中图分类号：
学科分类号：
摘要：
scale model. Fatigue tests were carried out to study the dominant fatigue cracking mode, stress concentration factor and fatigue strength of the critical detail. The results indicate that the critical detail of integral welded joint is the full penetration butt welding detail which connecting the top plate of joint, the upper flange of crossbeam and the gusset plate. The dominant fatigue crack is initiating from the gusset weld toe and propagating along the gusset plate thickness direction. The stress concentration factor of the weld toe of the gusset plate in the critical details is 1. 163, and that is 1. 789 in the weld toe of the upper flange of the crossbeam. The life of macro crack initiation of the two types of test models account for more than 75% of the total fatigue life. Therefore, the fatigue failure criterion of the two types of test models was uniformly defined as the occurrence of macroscopic fatigue cracks. Based on this, the fatigue strength of the critical detail obtained from the two types of test models are in good agreement. The nominal stress fatigue strength of critical detail is recommended to adopt FAT80 of the Specifications for design of highway steel bridge, and the hotspot stress fatigue strength is recommended to adopt FAT90 of Eurocode 3. © 2022 Xi'an Highway University. All rights reserved.
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页码：77 / 90
页数：13
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