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 Darwin 这项研究代表了美国四十多年来首次对钢筋几何形状进行重大重新评估的继续。 该研究利用当前的研究成果来开发新的变形模式，以优化棒材的发展特性。 测试用于评估新钢筋提供的粘合力的改进，无论有或没有环氧涂层，作为限制钢筋、覆盖层和钢筋间距的函数。 新钢筋的粘结特性也在循环载荷下进行了评估。断裂力学概念以及载荷和阻力系数设计技术用于开发理性而非经验的设计程序。 该研究是与钢筋生产商、制造商、涂料施工商和环氧粉末制造商合作进行的。 重点放在改进的杆变形模式上，该模式具有成本效益且实用。