国内外混凝土规范关于钢筋弯钩锚固形式的对比

Comparison of Anchorage Forms of Reinforcement Hook Specified in Chinese and Other International Concrete Codes

本文比较了国内外各个混凝土规范中关于钢筋弯钩锚固形式的相关规定,从弯钩弯后最小平直长度、弯钩内最小弯弧半径和弯钩锚固中受拉钢筋的锚固长度等三个方面加以分析,结果表明:除了澳大利亚规范的平直长度与弯弧半径有关外,其他国家规范的均只与钢筋直径有关;美国规范和欧洲规范的弯弧半径仅与钢筋直径有关,而其他国家规范的还考虑了涂层形式和钢筋种类等因素;除了美国规范有专门的公式计算弯钩受拉钢筋锚固长度外,其他国家规范的长度计算都是通过基本锚固长度或者设计锚固长度转化而来。

The provisions on the anchorage forms of reinforcement hook specified in Chinese and other international concrete codes are compared and analyzed from three aspects such as the minimum straight length in the rear of hook, the minimum curved radius and the anchorage length of hook’s reinforcement in tension. The results show that the straight length is related to the curved radius according to Australian code, but the former one is only affected by the diameter of reinforcement as per other international codes. The curved radius is only related to the diameter of reinforcement according to American and European codes, however, such factors as the forms of coating and the types of reinforcement are considered in other national standards. A special formula has been specified in American code, which is used for calculating the anchorage length of hook’s reinforcement in tension, in comparison with other international standards in which the above mentioned length is transformed through the basic anchorage length or design anchorage length.