Studies on Fatigue Crack Propagation Pattern and Design S-N Curves of Rib-to-deck Welded Joints in Orthotropic Steel Decks Using Thickened Edge U-ribs

被引：0
|
作者：
Feng X. [1 ]
Zheng K. [1 ]
Heng J. [1 ]
Lei M. [1 ]
Zhang Y. [1 ]
机构：
[1] School of Civil Engineering, Southwest Jiaotong University, Chengdu
来源：
Tiedao Xuebao/Journal of the China Railway Society | 2021年 / 43卷 / 04期
关键词：
Crack propagation; Design S-N curves; Multiple point cracking sources; Orthotropic steel deck; Thickened edge U-ribs; Visible micro-crack;
D O I：
10.3969/j.issn.1001-8360.2021.04.024
中图分类号：
学科分类号：
摘要：
Earlier studies have suggested that the fatigue performance of rib-to-deck (RD) welded joints in orthotropic steel decks (OSDs) can be effectively improved with thickened edge U-ribs (TEU). On this basis, two groups of seven local full-scale model fatigue tests were carried out. During the tests, along with acquisition of basic S-N data, the fatigue crack was monitored with respect to its initiation, coalescence and propagation. In addition, a detailed analysis was conducted using the fractography. The results reveal that fatigue cracks first initiate in the form of multiple point cracking sources along the RD joint, and then propagate in both the longitudinal direction and thickness of the steel plate until they coalesce into visible small cracks. Once the visible cracks are formed, they will grow along the longitudinal direction and the thickness of the plate at a relatively high rate before finally forming through cracks that cause the fatigue failure. It is worth noting that, during the initiation and propagation of fatigue cracks, their shapes gradually transform from the initial semi-circular point cracking sources to semi-elliptical visible cracks. Besides, based on the test data, the design S-N curve with the survival rate of 95% has been derived for RD joints in OSDs using TEUs, which can be used in the engineering design. © 2021, Department of Journal of the China Railway Society. All right reserved.
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页码：191 / 199
页数：8
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