Experimental study of fatigue on orthotropic steel deck of cable-stayed bridge

被引：1
|
作者：
Huang Z.-W. [1 ]
Lei J.-Q. [1 ]
Gui C.-Z. [1 ]
Guo S.-L. [1 ]
机构：
[1] College of Civil Engineering, Beijing Jiaotong University, Beijing
来源：
Zhejiang Daxue Xuebao (Gongxue Ban)/Journal of Zhejiang University (Engineering Science) | 2019年 / 53卷 / 06期
关键词：
Axial compressive force; Crack growth; Fatigue strength; Full-scale fatigue test; Orthotropic steel deck; U-rib embedded section;
D O I：
10.3785/j.issn.1008-973X.2019.06.006
中图分类号：
学科分类号：
摘要：
Orthotropic steel (Q500qE) deck of cable-stayed bridge with plate-truss composite structure was taken as the research object. Fatigue test and numerical simulation were done to study full-scale girder segment models with broad U-rib fatigue features of key fatigue details in orthotropic steel deck. Method of pre-stressing force was adopted to simulate the initial axial pressure in deck. The three segment models were loaded by 6.5 million variable amplitude fatigue cycles. Results prove that the initial long macro crack occurs in the bottom of butt-welded splice joints of U-rib-web. The length of initial macro crack is proportional to the stress amplitude. The crack growth stage of broad U-shape-rib can be divided into four parts with clear demarcation point between each part. Crack growth rate is proportional to crack length. Crack growth rate is increased under the effect of axial force. Fatigue strength of welding details can be increased when the excess weld metal of welding seam is eradicated and abraded after welding with back-up member for embedded section of broad U-rib. It is recommended that the butt joint weld of the wide U-rib embedded section can be designed with the fatigue strength of category 110 in China's specification for structural design of highway steel bridge (JTG D64-2015). © 2019, Zhejiang University Press. All right reserved.
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页码：1071 / 1082
页数：11
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