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新型分片预制装配式盖梁力学性能研究
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作者单位:

(1.上海市政工程设计研究总院(集团)有限公司, 上海 200092;2.同济大学建筑设计研究院(集团)有限公司, 上海 200092)

作者简介:

Zhanke Wu, M.E., Senior Engineer, graduated from Tongji University in 2009. Working at Shanghai Municipal Engineering Design Institute (Group) Co., Ltd. Research Direction: Bridge design.

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基金项目:

Shanghai Municipal Transportation Commission Research Project (grant number is JT2024-KY-022)


Mechanical Performance of Novel Split Precast Cap Beams
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Affiliation:

(1.Shanghai Municipal Engineering Design Institute (Group) Co., Ltd., Shanghai 200092, China; 2.Tongji Architectural Design (Group) Co., Ltd., Shanghai 200092, China)

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    摘要:

    文章提出一种用于桥梁领域的分片预制装配式盖梁,并通过试验和有限元分析研究了其结构力学性能。通过一个缩尺(1:3.6)模型试验对分片式盖梁的抗弯性能、抗裂性能及极限承载力进行了评估。结果表明,该技术在悬臂根部实现了适筋弯曲破坏,且延性良好,其平均抗裂安全系数和承载力安全储备系数分别为1.15和1.74。应变分析证实了预制构件与后浇带之间的有效组合作用,验证了空间平截面假定。试验揭示了梁端和悬臂根部存在局部应力集中现象,需采取专门的配筋构造措施。建立了一个非线性有限元模型,并通过试验数据进行了验证,两者吻合良好,成功模拟了包括裂缝萌生和破坏模式在内的结构行为。该分片预制技术已成功应用于上海外环线东段交通提升工程中的约40个盖梁。研究结果为在桥梁工程应用中优化和推广这一高效施工方法提供了理论与应用基础。

    Abstract:

    In this study, an innovative split precast assembly technique for bridge cap beams is proposed, and its structural performance is investigated via experimental testing and finite element analysis. A scaled (1:3.6) sample was tested to evaluate the flexural behavior, crack resistance, and ultimate capacity of the split precast cap beam. The results indicate that the proposed technique achieves moderately reinforced flexural failure at cantilever roots with satisfactory ductility, with average crack resistance and safety reserve coefficients of 1.15 and 1.74, respectively. Strain analysis confirmed effective composite action between the precast components and the postcast strip, validating the space plane-section assumption. The experiment reveals localized stress concentrations at the beam ends and cantilever roots that require special reinforcement detailing. A nonlinear finite element model was developed and validated against test data, which showed good agreement and successfully captured behavior, including crack initiation and failure modes. The split precast technique has been successfully implemented in approximately 40 cap beams for the Outer Ring East Section traffic improvement project in Shanghai, China. The findings provide both theoretical and practical foundations for optimizing and promoting this efficient construction method in bridge engineering applications.

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引用本文

Zhanke Wu, Jingyu Qiao Mechanical Performance of Novel Split Precast Cap Beams. Prestress Technology 2025,3(02):1-15. 10.59238/j. pt.2025.02.001

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历史
  • 收稿日期:2025-06-13
  • 最后修改日期:2025-06-24
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  • 在线发布日期: 2025-06-28
  • 出版日期: 2025-06-28