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Performance degradation prediction of extra-wide concrete self-anchored suspension bridge under vehicle load considering time-dependent effects

考虑时变效应的车载作用下超宽混凝土自锚式悬索桥性能退化预测

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Abstract

In order to study the influence of concrete shrinkage and creep effect and temperature change on the extra-wide concrete self-anchored suspension bridge under vehicle load, the Hunan Road Bridge, which is the widest concrete self-anchored suspension bridge in China, was chosen as background. Firstly, the refined finite element model (FEM) was established, which was validated by the measured data of field load test. Secondly, the structural states at different ages were predicted. Finally, the evolution laws of component responses were analyzed. The research results show that the bearing type of girder has significant influence on the response change trends. The shear lag effect of girder and local effect of wheel are significant. Under the temperature rise of 20 °C and standard vehicle load, the maximum tower displacement is 0.033 m after 30 years. In addition, the longitudinal tensile stress in most area of bottom plate at middle section exceeds 5 MPa. Moreover, the difference of girder deflection between road centerline and edge reaches 0.07 m under eccentric load after 10 years. The research results can provide an important basis for the health monitoring and safety evaluation of similar extra-wide concrete self-anchored suspension bridges.

摘要

为了研究混凝土收缩徐变效应和环境温度变化对车辆荷载作用下超宽混凝土自锚式悬索桥受力 性能的影响, 以目前中国最宽的混凝土自锚悬索桥——湖南路大桥为背景开展分析。首先, 建立桥梁 整体精细化有限元模型, 并结合现场荷载试验的实测数据进行验证。其次, 预测不同服役龄期时桥梁 的结构状态。最后, 分析主要构件力学响应的演化规律。研究结果表明, 主梁的支座类型对响应的变 化趋势有着显著影响。超宽主梁的剪力滞效应和车轮局部效应较为显著。在升温20 ℃和标准车辆荷载 作用下, 桥梁服役30 年后主塔的最大位移为0.033 m。此外, 中跨跨中主梁底板大部分区域的纵向拉 应力超过5 MPa。桥梁服役10 年后, 在偏心车辆荷载作用下, 主梁道路中心线处挠度和主梁边缘处挠 度之间的差值达到0.07 m。本文研究成果可为类似超宽混凝土自锚式悬索桥的健康监测和安全评价提 供重要依据。

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Authors and Affiliations

  1. School of Science, Nanjing University of Science and Technology, Nanjing, 210094, China

    Guang-pan Zhou  (周广盼), Ai-xiang Du  (杜爱祥) & Jin Fan  (范进)

  2. School of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing, 210094, China

    Ming-yang Wang  (王明)

  3. State Key Laboratory of Explosion and Impact and Disaster Prevention and Mitigation, Army Engineering University of PLA, Nanjing, 210007, China

    Ming-yang Wang  (王明)

  4. School of Civil Engineering, Southeast University, Nanjing, 210096, China

    Ai-qun Li  (李爱群)

  5. Beijing Advanced Innovation Center for Future Urban Design, Beijing University of Civil Engineering and Architecture, Beijing, 100044, China

    Ai-qun Li  (李爱群)

Authors
  1. Guang-pan Zhou  (周广盼)
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  2. Ai-xiang Du  (杜爱祥)
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  3. Ming-yang Wang  (王明)
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  4. Jin Fan  (范进)
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  5. Ai-qun Li  (李爱群)
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Contributions

ZHOU Guang-pan provided the concept and edited the draft of manuscript. DU Ai-xiang conducted the literature review and wrote the first draft of the manuscript. WANG Ming-yang validated the proposed method. FAN Jin edited the draft of manuscript. LI Ai-qun edited the draft of manuscript.

Corresponding author

Correspondence to Ming-yang Wang  (王明).

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Conflict of interest

ZHOU Guang-pan, DU Ai-xiang, WANG Ming-yang, FAN Jin, LI Ai-qun declare that they have no conflict of interest.

Foundation item: Project(BK20200494) supported by the Natural Science Foundation of Jiangsu Province, China; Project(2021M701725) supported by the China Postdoctoral Science Foundation; Project(2021K522C) supported by the Jiangsu Postdoctoral Research Funding Program, China; Project(30919011246) supported by the Fundamental Research Funds for the Central Universities, China

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Zhou, Gp., Du, Ax., Wang, My. et al. Performance degradation prediction of extra-wide concrete self-anchored suspension bridge under vehicle load considering time-dependent effects. J. Cent. South Univ. 30, 1932–1947 (2023). https://doi.org/10.1007/s11771-023-5360-2

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  • DOI: https://doi.org/10.1007/s11771-023-5360-2

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