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海水干湿作用带初始裂缝 RC 梁钢筋与混凝土粘结试验
Steel-concrete Bond Test of RC Beams with Initial Crack under Seawater Wet-dry Cycle Ingress
投稿时间: 2017-03-01  最后修改时间: 2017-05-18
DOI:
中文关键词:  钢筋混凝土  初始裂缝  海水侵蚀  粘结性能  混凝土强度
英文关键词:reinforced concrete  initial crack  seawater erosion  bond property  concrete strength
基金项目:The National Natural Science Foundation of China (General Program, Key Program, Major Research Plan)
作者单位E-mail
焦俊婷 厦门理工学院 jtjiao@xmut.edu.cn 
叶英华 北京航空航天大学  
陈勋 厦门理工学院  
严凌静 厦门理工学院  
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中文摘要:
      钢筋与混凝土之间粘结是影响钢筋混凝土结构安全性与耐久性关键因素之一。 本文针对海 水干湿环境中带预制裂缝钢筋与混凝土的粘结滑移性能进行研究。 通过实验室模拟沿海地区海水 干湿循环环境,带有不同初始裂缝宽度 W 和不同 混凝土强度的铰梁, 经海水浸泡 180d 干湿循环, 研究了 钢筋与混凝土之间粘结退化规律。 结果表明: (1) 钢筋与混凝土之间的极限粘结应力随 W 增加而降低。 混凝土强度分别为 C25、 C35 时, W=0.2mm 试件的限粘结应力较无裂缝试件的限粘结 应力分别降低了 14.94%、 15.92%。 (2) 极限粘结应力随混凝土强度的提高而增大, 混凝土强度 C35 试件的限粘结应力比 C25 试件的大 13.0%左右。 (3) 峰值滑移随混凝土强度增加而减小。
英文摘要:
      The bond between steel bar and concrete was the key influencing factor of the safety and durability for reinforced concrete structure. In this paper the bond slip property between steel bar and concrete was studied with initial crack in seawater wetting and drying ingress. By laboratory simulating coastal working environment, the beam specimens with initial different width crack were researched after seawater immersion 180d dry-wet cycle; then different initial crack width (W) and different concrete strength were investigated on the degradation law of the bond behavior between steel bar and concrete. The results showed: (1) The ultimate bond stress between steel bar and concrete was decreased with W increasing. When concrete strength was C25 and C35, The ultimate bond stress of the specimens with W=0.2mm were lower by 14.94% and 15.92% than those with no initial crack. (2) The ultimate bond stress was increasing with concrete strength was increasing. The ultimate bond stress of C25 was more 13.0% than that of C35. (3) The peak slip became smaller if concrete strength would increase.
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