钢筋混凝土深梁、短梁和浅梁受剪承载力的统一计算方法

本文分析了钢筋混凝土深梁（ｌ／ｈ≤２）、短梁（ｌ／ｈ＝２～５）和浅梁（ｌ／ｈ＞５）的受剪机理和破坏特点,提出了考虑深梁、短梁和浅梁受力特点的桁架拱受力模型,引用混凝土在双向应力状态下的强度准则求出了考虑剪跨比、跨高比、垂直腹筋和水平腹筋影响的受剪承载力计算公式。通过简化分析给出了钢筋混凝土深梁、短梁和浅梁受剪承载力的实用统一计算公式,该公式与试验结果符合良好,并能与现行规范ＧＢＪ１０－８９中深梁和浅梁受剪承载力公式衔接。

An Unified Calculation Method for Shear Capacity of R. C. Deep Beams, Short Beams and Shallow Beams

In this paper, the shear failure modes and behavior of deep beams (l/h≤2), short beams (l/h=2～5) and shallow beams (l/h>5) are discussed, and the "truss-arch" model is suggested to analyze the shear capacity of beams. Using the failure criterion of concrete in biaxial compression and considering the effects of shear span ratio, span depth ratio, vertical web reinforcement and horizontal web reinforcement, the formulas for predicting shear capacity of the beams are established. Through simplification of analysis, the suggested unified formulas for calculating shear capacity of deep beams, short beams and shallow beams in design are also derived. The calculating results of these formulas show a good agreement with those of the tests. Furthermore, the formulas can be linked up with the formulas of deep beams and shallow beams given in chinese code for design of concrete structures (GBJ 10-89).