Improving Developmental Characteristics of Reinforcing Bars

改善钢筋的发育特性

• 批准号: 9402563
• 负责人: David Darwin
• 金额: $ 23.53万
• 依托单位: University of Kansas Center for Research Inc
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1994
• 资助国家: 美国
• 起止时间: 1994-12-01 至 1998-11-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9402563&HistoricalAwards=false
• 关键词: Improving; Developmental; Characteristics; Reinforcing; Bars

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.

9402563达尔文这项研究代表了40年来美国增强杆几何形状的首个重估。 该研究利用了当前的研究工作，以开发新的变形模式，以优化条形发育特征。 测试用于评估带有和没有环氧涂层的新棒提供的粘结的改善，这是限制加固，覆盖和条间距的函数。 在循环载荷下还评估了新条的键特性。断裂力学概念以及负载和阻力因子设计技术用于发展理性而不是经验设计程序。 这项研究是与加强棒生产商，制造商，涂料涂料器和环氧粉制造商一起进行的。 重点放在改进的钢筋变形模式上，这些模式具有成本效益和实用性。