Shear Strength of Continuous Lightly Reinforced Concrete Joist Systems

连续轻钢筋混凝土托梁系统的抗剪强度

• 批准号: 8816158
• 负责人: David Darwin
• 金额: $ 16.89万
• 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: 1989
• 资助国家: 美国
• 起止时间: 1989-01-01 至 1991-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8816158&HistoricalAwards=false
• 关键词: Shear; Strength; Continuous; Lightly; Reinforced

Lightly reinforced concrete members are widely used in practice. In spite of their widespread use, there has been very little research regarding the shear capacity of these members, especially continuous members and members with tapered webs such as joists. Limited research indicates that the shear capacity of lightly reinforced members is below that predicted by current design procedures. Thus, these structural components appear to have a lower margin of safety than other components of reinforced concrete structures. The current research will determine the shear strength of continuous, lightly reinforced T.beams and joists. Both single web and triple web members will be tested. The effects of flexural reinforcement ratio, degree of shear reinforcement, and load sharing between joists will be considered. The cracking shears will be compared with existing empirical and analytical expressions. The contribution of concrete, shear reinforcement, dowel action and aggregate interlock to shear strength will be estimated. Modifications to current design expressions will be developed. The research will fill a major gap in current understanding and allow the formulation of rational design provisions. The research will result in improved safety for an important class for reinforced concrete structural components.

轻筋混凝土构件在工程实践中应用广泛。 尽管它们被广泛使用， 关于这些构件的抗剪承载力的研究， 特别是连续构件和具有锥形腹板的构件， 作为托梁。 有限的研究表明， 轻筋构件的强度低于目前预测的强度 设计程序 因此，这些结构组件似乎 安全系数低于其他增强型组件 混凝土结构。 目前的研究将确定 连续、轻筋T梁抗剪强度， 托梁 将对单腹板和三腹板构件进行测试。 受弯配筋率、受剪程度对钢筋混凝土梁抗弯承载力的影响 钢筋和托梁之间的负荷分配将是 考虑了 开裂剪将与现有的 经验和分析表达式。 的贡献 混凝土，抗剪钢筋，传力杆作用和骨料 将估计互锁剪切强度。 修改 将开发当前的设计表达式。 这项研究将 填补了目前认识上的一个重大空白， 制定合理的设计规定。 这项研究将 结果是提高了安全性的一个重要类别， 混凝土结构构件。