Shear Strength of Continuous Lightly Reinforced Concrete Joist Systems

轻钢筋混凝土构件在实践中得到了广泛的应用。尽管它们被广泛使用，但很少有关于这些构件的抗剪能力的研究，特别是连续构件和带有锥形腹板的构件，如托梁。有限的研究表明，轻配筋构件的抗剪能力低于当前设计程序的预测。因此，这些结构部件似乎比钢筋混凝土结构的其他部件具有更低的安全裕度。目前的研究将确定连续、轻配筋t梁和托梁的抗剪强度。单网和三网成员都将被测试。将考虑受弯配筋率、受剪配筋程度和托梁间荷载分担的影响。将开裂剪切与现有的经验表达式和解析表达式进行比较。将估算混凝土、剪力钢筋、销钉作用和骨料互锁对抗剪强度的贡献。将开发对当前设计表达式的修改。该研究将填补目前理解的主要空白，并允许制定合理的设计规定。该研究将有助于提高一类重要的钢筋混凝土结构部件的安全性。

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.