Improving Developmental Characteristics of Reinforcing Bars

9402563达尔文这项研究代表了四十多年来美国钢筋几何形状第一次重大重估的延续。 这项研究利用目前的研究工作，开发新的变形模式，优化酒吧的发展特点。 测试是用来评估改善债券所提供的新酒吧，无论是有和没有环氧树脂涂层，作为一个功能的限制钢筋，封面，和酒吧的间距。 在循环荷载作用下，对新型钢筋的粘结性能进行了评价。断裂力学的概念和负载和阻力系数设计技术用于开发合理的，而不是经验，设计程序。 这项研究是与钢筋生产商、制造商、涂料涂覆商和环氧粉末制造商一起进行的。 重点放在改进的酒吧变形模式，是成本效益和实用。

9402563 Darwin The research represents the continuation of the first major revaluation of reinforcing bar geometry in the United States in over forty years. The study capitalizes on current research efforts to develop new deformation patterns that optimize bar development characteristics. Tests are used to evaluate the improvement in bond provided by the new bars, both with and without epoxy coating, as a function of confining reinforcement, cover, and bar spacing. The bond characteristics of the new bars also evaluated under cyclic loading. Fracture mechanics concepts and load and resistance factor design techniques are used to develop rational, rather than empirical, design procedures. The research is carried out in conjunction with reinforcing bar producers, fabricators, coating applicators, and epoxy powder manufacturers. Emphasis is placed on improved bar deformation patterns that are cost effective and practical.