Fatigue-resistant design method of steel bridge deck based on multi-modes failure damage compatibility

被引：0
|
作者：
Zhang Q. [1 ]
Da L. [1 ]
Li M. [1 ]
Lao W. [1 ]
Cui C. [1 ]
机构：
[1] Southwest Jiaotong University, Chengdu
来源：
Tumu Gongcheng Xuebao/China Civil Engineering Journal | 2022年 / 55卷 / 12期
关键词：
bridge engineering; damage compatibility; design method; fatigue; multi-modes failure; orthotropic steel bridge deck;
D O I：
10.15951/j.tmgcxb.21101027
中图分类号：
学科分类号：
摘要：
Fatigue load is the external factor that determines the fatigue life of orthotopic steel bridge decks, and heavy load especially leads to a great reduction in the fatigue life of the structures. Multiple structural details and multi-modes failure are the basic properties of steel bridge decks, whose fatigue performance is determined by the fatigue failure mode of the structural detail with the shortest fatigue life. Based on the relationship between fatigue crack growth rate and fatigue life, a generalized equivalent structural stress method is proposed considering the fatigue life effect of shear structural stress, which is capable of evaluating the fatigue performance of steel bridge decks with multiple structural details and multi-modes failure. This method can uniformly characterize the fatigue resistance indicators of all of the relevant structural details and failure modes. Furthermore, the steel bridge deck structure is divided into multi-level subsystems by taking the structure details as the unit and the fatigue damage accumulation compatibility index is proposed. And the fatigue-resistant design method of steel bridge deck based on multi-modes failure damage compatibility is established. In addition, the fatigue properties of three types of steel bridge deck structures are theoretically analyzed and measured in fatigue test with the compatibility of multi-modes failure. The main goal of this work is to effectively prolong the fatigue life of steel bridge decks. The research results show that the proposed generalized equivalent structural stress method is suitable for the fatigue performance evaluation of each structural detail of the steel bridge deck and its related fatigue failure modes, and can accurately determine the dominant fatigue failure mode of the steel bridge deck. The proposed fatigue-resistant design method of steel bridge deck based on multi-modes failure damage compatibility facilitate to guide the design of steel bridge deck, and provide a scientific basis for effectively improving the fatigue life of steel bridge deck. © 2022 Editorial Office of China Civil Engineering Journal. All rights reserved.
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页码：80 / 93
页数：13
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