Resolving Bond Challenges in Reinforced Concrete and Masonry Structures

解决钢筋混凝土和砌体结构中的粘结挑战

• 批准号: 341266-2013
• 负责人: Feldman, LisaRobin
• 金额: $ 1.75万
• 依托单位: University of Saskatchewan
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2015
• 资助国家: 加拿大
• 起止时间: 2015-01-01 至 2016-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=572214
• 关键词: Resolving; Bond; Challenges; Reinforced; Concrete

The existence of bond, otherwise described as strain compatibility between the reinforcement and the surrounding cementitious materials, is one of the fundamental assumptions used in the analysis of reinforced concrete and masonry members, and influences member ductility as well as shear and flexural response. An accurate assessment of bond is therefore necessary to ensure proper detailing of the reinforcement, and so the safety and economy of reinforced concrete and masonry structures. Though masonry is one of the oldest building materials, research in this area has been quite minimal. As a result, some aspects of design codes lack consistency and are not rationally-based. A case in point is that the requirements for the development and splicing of reinforcement, as provided by the U.S. masonry standard, are significantly more conservative than those provided by the Canadian standard, particularly for larger bar sizes. It is hypothesized that bringing the lessons learned from 100+ years of study of bond in reinforced concrete to masonry research will allow for a rationalization of these two sets of standards and a re-evaluation of code provisions. This will be based on a unique and comprehensive experimental program which will include the development of analytical relationships to verify the hypothesis of this study. Furthermore, recent bridge collapses and exposés on the state of the nation's infrastructure have highlighted the need for proper evaluation techniques for existing structures. Historical reinforced concrete structures may have been built with plain reinforcement, or deformed bars that do not conform to modern standards. It is hypothesized that the bond performance of these bars differs from that of modern deformed bars. Experimental and analytical work is required to reach the goal of improving evaluation techniques for practicing engineers. Three M.Sc. students and three Ph.D. students will participate in the proposed research. These students will be trained in an area that is strategically important to Canada's economy.

粘结的存在，也称为钢筋和周围胶凝材料之间的应变相容性，是钢筋混凝土和砌体构件分析中使用的基本假设之一，并影响构件的延性以及剪切和弯曲响应。 因此，有必要对粘结进行准确的评估，以确保钢筋的适当详细说明，从而确保钢筋混凝土和砌体结构的安全性和经济性。 虽然砖石是最古老的建筑材料之一，但这方面的研究却很少。 因此，设计规范的某些方面缺乏一致性，也没有合理的依据。 一个恰当的例子是，美国砌体标准规定的钢筋开发和拼接要求比加拿大标准规定的要求要保守得多，特别是对于较大的钢筋尺寸。 据推测，从100多年的钢筋混凝土粘结研究中吸取的教训，砌体研究将允许这两套标准的合理化和重新评估规范规定。 这将基于一个独特而全面的实验计划，其中包括开发分析关系来验证本研究的假设。 此外，最近发生的桥梁倒塌和对国家基础设施状况的破坏突出表明，需要对现有结构进行适当的评估。 历史上的钢筋混凝土结构可能是用普通钢筋或不符合现代标准的变形钢筋建造的。 据推测，这些钢筋的粘结性能不同于现代变形钢筋。 需要实验和分析工作，以达到提高执业工程师的评估技术的目标。 三名硕士生和三名博士生。学生将参与拟议的研究。 这些学生将在对加拿大经济具有战略重要性的领域接受培训。