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焦俊婷*,叶英华,陈勋,严凌静.海水干湿作用下带初始裂缝RC梁钢筋与混凝土粘结试验[J].实验力学,2018,33(4):577~582
海水干湿作用下带初始裂缝RC梁钢筋与混凝土粘结试验
Experiment of steel-concrete bonding properties of RC beam with initial crack and in seawater erosion environment
投稿时间: 2017-03-01  最后修改时间: 2017-05-18
DOI:10.7520/1001-4888-17-042
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  sea water erosion  bonding property  concrete strength
基金项目:国家自然科学基金资助项目(51478404, 51578031);福建省青年创新基金(2016J05141)
作者单位
焦俊婷* 厦门理工学院 土木工程与建筑学院, 福建 厦门 361024 
叶英华 北京航空航天大学 机场与道路工程系, 北京 100091 
陈勋 厦门理工学院 土木工程与建筑学院, 福建 厦门 361024 
严凌静 厦门理工学院 土木工程与建筑学院, 福建 厦门 361024 
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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的关键因素之一。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。在实验室内模拟了沿海地区海水干湿循环环境,制作了带有不同初始横向裂缝宽度W 和不同混凝土强度C的铰梁,并经海水浸泡180d干湿循环, 研究了钢筋与混凝土之间的粘结退化规律。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试件的极限粘结应力较无裂缝试件的极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,当初始横向裂缝宽度相同时,混凝土强度C35试件的极限粘结应力比C25试件的大11.5%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 is one of the key factors affecting the safety and durability of reinforced concrete structure. In this paper, the bond slip behavior between steel bar and concrete of RC beam with pre-fabricated cracks and in dry and wet seawater environment is studied. The coastal area sea water circulation environment was simulated in laboratory. Hinged beams with different initial transverse crack widths W and different concrete strengths C were fabricated,which were subjected to 180 day sea water wet and dry cyclic erosion treatment. Then the bond degradation behavior between steel bar and concrete was studied. Results show that (1) the ultimate bond stress between steel bar and concrete decreases along with the increase of W. When concrete strengths are C25 and C35 respectively and W=0.2mm, the ultimate bond stresses of specimens were reduced by 14.94% and 15.92% respectively compared with that of specimens without initial crack. (2) The ultimate bond stress increases along the increase of concrete strength. When the initial transverse crack widths are the same, the ultimate bond stress of concrete strength C35 is higher than that of C25 by about 11.5%. (3) The peak value slip decreases with the increase of concrete strength.
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