随机车辆荷载流下UHPC加固正交异性钢桥面板疲劳性能评估
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(洛阳腾飞市政工程有限公司, 河南 洛阳 471000)

作者简介:

尤永学(1967—), 男, 本科, 高级工程师, 从事桥梁施工技术工作。

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中图分类号:

U443.31

基金项目:

高模量路基柔性基层沥青路面关键技术研究


Evaluation on Fatigue Performance of Orthotropic Steel Bridge Deck Reinforced by UHPC under Random Vehicle Load Flow
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    摘要:

    疲劳开裂是正交异性钢桥面板常遭遇的病害之一,而其与桥面铺装刚度较大使得关键细节应力幅过大密切相关,因此,利用UHPC提升桥面铺装刚度是缓解疲劳应力的重要手段。为研究实际车流作用下的关键细节的疲劳性能,以跨沿洛河某公路斜拉桥为例,开展了钢-UHPC组合铺装正交异性钢桥面板构造细节的应力影响面分析,并利用监测记录的实际车流对构造细节进行加载分析,获得其应力谱;基于Miner疲劳损伤等效原则计算得到了最大应力幅、等效应力幅及疲劳加载次数。结果表明:采用UHPC加固桥面铺装将显著降低构造细节应力,并改善了构造细节的力学行为,显著降低了面板上构造细节的应力幅,使得纵肋-面板焊缝构造细节和面板对接焊缝构造细节所记录到的最大应力幅均小于常幅疲劳极限。

    Abstract:

    Fatigue cracking is one of the common diseases of orthotropic steel bridge deck, which is closely related to the excessive stress amplitude of key details caused by the large stiffness of bridge deck pavement. Using UHPC to improve the stiffness of bridge deck pavement is an important means to alleviate fatigue stress. In order to study the fatigue performance of key details under the action of actual traffic flow, taking a cable-stayed bridge of highway spanning Luohe River as an example, the analysis on the stress influence surface of structural details of the steel-UHPC composite paved orthotropic steel deck is carried out, and the loading analysis on the structural details is carried out by the actual traffic flow of monitoring records to obtain its stress spectrum. Based on Miner fatigue damage equivalent principle, the maximum stress amplitude, equivalent stress amplitude and fatigue loading times are calculated and obtained. The results show that UHPC to reinforce the deck pavement can significantly reduce the stress of structural details, improve the mechanical behavior of structural details, and significantly reduce the stress amplitude of structural details on the deck slab so that the maximum stress amplitude recorded by the structural details of longitudinal rib - deck slab weld and the deck slab butt weld is less than the constant amplitude fatigue limit.

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  • 收稿日期:2021-05-15
  • 最后修改日期:2021-05-15
  • 录用日期:2021-06-08
  • 在线发布日期: 2022-03-07
  • 出版日期: 2021-03-15
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