河北水利电力学院学报

河北水利电力学院学报 ›› 2019, Vol. 29 ›› Issue (4): 8-15.DOI: 10.16046/j.cnki.issn2096-5680.2019.04.002

• 技术理论与应用 • 上一篇    下一篇

混杂纤维混凝土剪力键滞回试验损伤及应变分析

李长辉1，王朝辉2   

  1. 1.中国民航大学机场学院，天津市东丽区津北公路2898号 300300;
    2.长安大学公路学院，陕西省西安市南二环路中段 710064

  • 收稿日期:2019-09-12 出版日期:2019-12-31 发布日期:2020-01-30
  • 作者简介:李长辉(1989-)，男，河北省成安县人，博士，讲师，研究方向为:混凝土新材料及结构抗震性能｡E-mail:lichanghui0531@126.com
  • 基金资助:
    国家自然科学基金资助项目“软土地基上深水桥梁破坏机理研究”（51808270,51809132）; 中央高校基金项目（3122019102,3122019106)

Damage and Strain Analysis of Hybrid Fibre Shear Keys Under Hysteretic Tests

LI Chang-hui 1，WANG Chao-hui 2   

  1. 1.College of Airport，Civil Aviation University of China，300300，Tianjin，China;
    2.College of Road，Chang’An University，710064，Xi’An，Shanxi，China

  • Received:2019-09-12 Online:2019-12-31 Published:2020-01-30

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摘要： 文中以沉管隧道为研究对象,通过采用拟静力滞回试验的方法,研究了沉管隧道接头间混杂纤维混凝土剪力键及普通混凝土剪力键的损伤积累过程、混凝土应变及钢筋应变的变化规律。试验表明,掺入纤维后的混凝土剪力键的损伤相比于普通混凝土剪力键的损伤有明显的减小。当剪力键的配筋及混凝土标号相同时,混杂纤维混凝土E3左侧剪力键及右侧剪力键在破坏阶段的累积损伤指数相比较于普通混凝土A3左侧剪力键及右侧剪力键分别减少了34.3%和30.8%。在一个混凝土应变片中可以有多条微裂缝同时穿过应变片,U型剪力键混凝土表面裂缝沿混凝土应变片h1-h2-h3顺序展开,T型剪力键混凝土表面裂缝沿混凝土应变片h4-h5-h6顺序展开。

关键词: 混杂纤维混凝土, 剪力键, 混凝土应变, 钢筋应变

Abstract: The process of damage accumulation，variation law of concrete strain and steel strain of the shear keys between segments of immersed tunnel are investigated in this paper by hysteretic tests.The hysteretic test result shows that the damage of hybrid fibres shear keys is smaller than normal concrete shear keys in each stage during hysteretic tests.As the reinforcement ratio and the concrete grade are the same，the damage index of the left and right hybrid shear keys of E3was 34.3%and 30.8%less than those of normal left and right shear keys of A3due to the addition of fibres，respectively.The hysteretic test result also shows that there are multiple micro concrete cracks spreading on one concrete strain gauge.The concrete cracks of U-shape shear keys and T-shape shear keys are spreading via concrete strain gauge h1-h2-h3and h4-h5-h6，respectively.

Key words: hybrid fibre concrete, shear key, concrete strain, steel strain

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