Evaluation of Reinforcement Effect of Steel-UHPC Composite Deck for Long-span Steel Box Girder Cable-stayed Bridge

被引：0

作者：

Qin S. ^{[1
]}

Zhang J. ^{[1
]}

Huang C. ^{[1
]}

Gao L. ^{[2
,3
]}

机构：

[1] School of Civil Eng. and Architecture, Wuhan Univ. of Technol., Wuhan

[2] China Railway Bridge Sci. Research Inst. Ltd., Wuhan

[3] State Key Lab. for Health and Safety of Bridge Structures, Wuhan

来源：

Gongcheng Kexue Yu Jishu/Advanced Engineering Sciences | 2022年 / 54卷 / 03期

关键词：

Fatigue; Pavements; Reinforcement; Steel bridges; Ultra-high performance concrete;

D O I：

10.15961/j.jsuese.202100183

中图分类号：

学科分类号：

摘要：

To evaluate the reinforcement effect of steel-UHPC (Ultra-High Performance Concrete) composite deck for a long-span steel box girder cable-stayed bridge, an in-situ test was carried out under random traffic flow. The fatigue performance of orthotropic steel decks with steel-UHPC composite deck and ERE (epoxy bond chips layer, resin asphalt, epoxy bond chips layer) deck were evaluated by Specifications for Design of Highway Steel Bridge (JTG D64-2015), based on the in-situ strain monitoring data. The residual fatigue life of fatigue-prone details was calculated by Miner's linear cumulative damage rule. To check the crack resistance of the UHPC layer of the steel-UHPC composite deck and calculate the steel deck maximum deflection and the asphalt pavement maximum tensile stress, a finite element model was established. The results showed that there were large stresses in the rib side of the rib-to-deck welded joint, the floor beam cutout, and the rib splice welded joint. These areas' residual fatigue life is 214, 186, and 61 years, respectively. The rib splice welded joint had the risk of fatigue failure in the design reference period. The maximum stresses amplitude of each fatigue-prone detail decreased below the constant amplitude fatigue limit, and the residual fatigue life increased to infinity after the orthotropic steel deck was strengthened with a steel-UHPC composite deck. The maximum tensile stress of the UHPC layer of the steel-UHPC composite deck was 4.68 MPa, and the crack resistance met the design requirements. After the orthotropic steel deck was strengthened with a steel-UHPC composite deck, the stiffness of the orthotropic steel deck was improved obviously, the steel deck's maximum deflection was 0.69 mm with a reduction of 34%. The maximum tensile stress of asphalt pavement was 0.42 MPa with the reduction of 59%. The fatigue performance of each fatigue-prone detail met the design requirement after the orthotropic steel deck was strengthened with a steel-UHPC composite deck, and the crack resistance of the deck pavement was improved. Copyright ©2022 Advanced Engineering Sciences. All rights reserved.

引用

页码：139 / 148

页数：9

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