正交异性钢-钢纤维混凝土组合桥面板疲劳极限状态研究

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中文摘要：为了解正交异性钢-钢纤维混凝土(Steel Fiber Reinforced Concrete,SFRC)组合桥面板的疲劳性能及失效机理,以川南城际铁路临港长江大桥为背景,设计、制作正交异性钢-SFRC组合桥面板足尺模型进行疲劳试验,采用ANSYS软件建立试件有限元模型,研究关键细节的疲劳应力和开裂等情况.基于有限元模型,分析不同设计参数(钢顶板厚度、栓钉布置、SFRC 抗拉强度及层厚)下组合桥面板疲劳极限状态的失效模式,并提出了主要控制参数取值建议.结果表明:200 万次疲劳加载后足尺模型的实测最大裂缝宽度为 0.136 mm,出现在SFRC层上缘,钢结构未开裂,组合桥面板疲劳性能良好;组合桥面板疲劳极限状态主要由SFRC层开裂控制,钢顶板厚度、栓钉布置对组合桥面板疲劳性能的影响较小,SFRC 抗拉强度和层厚对组合桥面板疲劳性能影响较大,为主要控制参数;在常规正交异性钢桥面板上铺设薄层(厚度不超过50 mm)SFRC时,SFRC 抗拉强度不应小于 5 MPa,在常规正交异性钢桥面板上铺设普通 SFRC(钢纤维体积含量不高于 1%,抗拉强度不高于 3 MPa)时,SFRC层厚不宜低于 100 mm.

外文标题：Fatigue Limit State of Orthotropic Steel Plate and Steel Fiber Reinforced Concrete Composite Bridge Deck

外文摘要：This study investigates the fatigue performance and failure mechanism of the bridge deck composed of orthotropic steel plates acting compositely with the overlaid steel fiber reinforced concrete(SFRC)pavement.The Lingang Changjiang River Bridge of the Intercity Railway of Southern Sichuan is used as a case.A full-scale mockup was prepared for fatigue tests.The fatigue stresses and cracking condition of the critical details of the mockup were simulated in ANSYS,and the failure modes of the bridge deck at fatigue limit state were analyzed considering varying values of design parameters,including the thickness of steel plates,arrangement of studs,and the tensile strength and thickness of SFRC pavement,the values of the primary control parameters were suggested.It is concluded that the measured maximum crack width in the mockup is 0.136 mm after 2 million load cycles,and the cracks are in the upper edge of SFRC pavement,and no cracks are observed in steel components,indicating that the fatigue performance of the composite deck is sound.The fatigue limit state of the composite bridge deck is mainly controlled by the cracking of SFRC pavement,the effects of steel plate thickness and stud layout on the fatigue performance of the composite deck is minor,while the effects of tensile strength and thickness of SFRC pavement are significant,which serve as main control parameters.When placing a thin layer of SFRC(with a thickness less than 50 mm)on the orthotropic steel plates,the tensile strength of SFRC should be no less than 5 MPa.When placing common SFRC(with the steel fiber volume less than 1%and the tensile strength no less than 3 MPa)on the orthotropic steel plates,the thickness of SFRC should be over 100 mm.

外文关键词：

composite deckorthotropic steel platesteel fiber reinforced concretefatigue failure modeparametric analysisfull-scale model testfinite element method

作者：

叶华文、潘威洲、何建希、叶杨帆、邓雪峰

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作者单位：

西南交通大学土木工程学院,四川成都 610031

成都市市政工程设计研究院有限公司,四川成都 610023

关键词：

组合桥面板正交异性钢板钢纤维混凝土疲劳失效模式参数分析足尺模型试验有限元法

基金：

国家重点研发计划项目中国中铁股份有限公司科技研究开发计划项目

项目编号：

2023YFB26044032023-专项-02

出版年：

2024

DOI：

10.20051/j.issn.1003-4722.2024.04.007

桥梁建设

中铁大桥局集团有限公司

桥梁建设

CSTPCD北大核心

影响因子：1.428

ISSN：1003-4722

年,卷(期)：2024.54(4)