长江科学院院报 ›› 2024, Vol. 41 ›› Issue (9): 161-168.DOI: 10.11988/ckyyb.20230437

• 水工结构与材料 • 上一篇    下一篇

不同加载速率下钢筋与橡胶混凝土的粘结性能

李恒1(), 平克磊1, 陈为民2, 罗云枫3,4, 曹玉贵3,4()   

  1. 1 中国市政工程西北设计研究院有限公司,武汉 430056
    2 中交第二航务工程局第六工程分公司,武汉 441000
    3 武汉理工大学 土木工程与建筑学院,武汉 430070
    4 武汉理工大学 三亚科教创新园,海南 三亚 572024
  • 收稿日期:2023-04-23 修回日期:2023-10-11 出版日期:2024-09-01 发布日期:2024-09-20
  • 通讯作者: 曹玉贵
  • 作者简介:

    李 恒(1983-),女,湖北武汉人,高级工程师,硕士,主要从事路面材料的研究。E-mail:

  • 基金资助:
    国家自然科学基金项目(U2006224); 武汉理工大学三亚科教创新园开放基金项目(2021KF0005); 中建市政西北院课题(XBSZKY2036)

Bonding Performance between Steel Bar and Rubberized Concrete under Different Loading Rates

LI Heng1(), PING Ke-lei1, CHEN Wei-min2, LUO Yun-feng3,4, CAO Yu-gui3,4()   

  1. 1 China Municipal Engineering Northwest Design and Research Institute Co., Ltd., Wuhan 430056, China
    2 The Sixth Engineering Branch of CCCC Second Navigation Engineering Bureau, Wuhan 441000, China
    3 School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan 430070, China
    4 Sanya Science and Education Innovation Park, Wuhan University of Technology, Sanya 572024, China
  • Received:2023-04-23 Revised:2023-10-11 Published:2024-09-01 Online:2024-09-20
  • Contact: CAO Yu-gui

摘要:

钢筋与橡胶混凝土之间良好的粘结性能,是橡胶混凝土工程应用的基础。为研究不同加载速率下钢筋与橡胶混凝土的粘结性能,对钢筋橡胶混凝土试件进行不同加载速率(0.01~1 mm/s)下的中心拉拔试验,分析加载速率、橡胶替换率及钢筋直径对钢筋与橡胶混凝土粘结性能与破坏状态的影响。试验结果表明,钢筋直径对拉拔试件的破坏方式影响显著,钢筋直径18 mm的试件发生劈裂破坏,钢筋直径14 mm的试件发生钢筋拔出破坏。此外,加载速率对粘结滑移曲线中的关键参数值也有显著影响。通过理论分析提出了不同加载速率下钢筋与橡胶混凝土粘结滑移关系计算模型,模型评估结果表明新建立模型的计算结果与试验结果吻合良好,可以用于预测不同加载速率下钢筋与橡胶混凝土之间的粘结滑移关系。

关键词: 橡胶混凝土, 钢筋, 拉拔试验, 加载速率, 粘结性能

Abstract:

The bond strength between steel bars and rubberized concrete is crucial for the engineering application of rubberized concrete. To investigate the bonding properties under various loading rates, center pull-out tests were conducted under a range of loading rates (0.01 mm/s to 1 mm/s). The impacts of loading rate, rubber replacement ratio, and steel bar diameter on the bonding performance and the failure mode were examined. Results indicate that steel bar diameter significantly influences the failure mode of the pull-out specimens: specimens with 18 mm diameter bars exhibited split failures, while those with 14 mm diameter bars experienced pull-out failures. Additionally, loading rate markedly affects key parameters in the bond stress-slip curve. Based on theoretical analysis, a new model for the bond-slip relationship between steel bars and rubberized concrete under varying loading rates was proposed. Model evaluation demonstrates that predictions from this model align well with experimental results, which manifests the model’s applicability to predicting the bond stress-slip relationship between steel bars and rubberized concrete across different loading rates.

Key words: rubberized concrete, steel bar, pull-out test, loading rate, bonding performance

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