超高性能混凝土组合桥面板集群化短焊钉抗疲劳特性
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作者单位:

1.同济大学 土木工程学院,上海 200092;2.上海市政工程设计研究总院(集团)有限公司,上海 200092

作者简介:

徐 晨(1982—),男,副教授,博士生导师,工学博士,主要研究方向为钢与组合结构桥梁以及功能复合材料的开发与应用。 E-mail: xuchenprc@tongji.edu.cn

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中图分类号:

U433.33

基金项目:

国家自然科学基金(51978501)


Anti-fatigue Characteristics of Short Grouped-stud in Ultra-high Performance Concrete Composite Bridge Decks
Author:
Affiliation:

1.College of Civil Engineering, Tongji University, Shanghai 200092, China;2.Shanghai Municipal Engineering Design Institute (Group) Co., Ltd., Shanghai 200092, China

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    摘要:

    进行4个单钉和2个群钉疲劳推出试验,将短焊钉疲劳寿命与国内外规范中的焊钉S?N曲线进行比较,并结合塑性损伤有限元模型展开分析。结果表明:短焊钉疲劳破坏表现为根部剪断和周围超高性能混凝土(UHPC)局部压溃;集群化短焊钉疲劳寿命较单钉减少26.9%,在疲劳加载过程中抗剪刚度退化显著快于单钉,当加载次数达到疲劳寿命的12.0%附近时,抗剪刚度比减小至16%左右;AASHTO规范有较大的安全储备,相比之下日本规范(JSCE)与试验结果最为接近,安全富余较少。此外,疲劳荷载下集群化短焊钉根部循环应变幅大于单钉,而且周边UHPC的塑性损伤累积分布更大。

    Abstract:

    Four single-stud and two grouped-stud fatigue push-out tests were conducted. The fatigue test results of studs were compared with the stud fatigue S-N curve in domestic and international codes, and the finite element analysis based on material plastic damage model was done. It is shown that: the stud root fracture and local UHPC crush around the stud root are the main failure mode; compared with single-stud specimen, the fatigue life of grouped-stud specimen is reduced by 26.9%, and the shear stiffness of grouped-stud specimen degrades more rapidly during cyclic loading; particularly, the stud shear stiffness ratio decreases to 16% when loading cycles reach 12.0% of fatigue life; the AASHTO based evaluation has the largest safety redundancy among the codes while the JSCE based evaluation is closest to the test results but with a low level of safety redundancy. In addition, the finite element analysis results show that the maximum cyclic strain amplitude at stud root obtained from grouped-stud model is larger than that obtained from single-stud model, and the plastic accumulation damage of UHPC around stud root in grouped-stud model is severer than that in single-stud model.

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徐晨,肖涵,王巍.超高性能混凝土组合桥面板集群化短焊钉抗疲劳特性[J].同济大学学报(自然科学版),2022,50(5):667~677

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  • 收稿日期:2021-06-19
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  • 在线发布日期: 2022-06-07
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