无腹钢筋混凝土梁的抗剪承载力

Shear capacity of reinforced concrete beams without web

结合GBJ10 89混凝土结构设计规范修订课题,对钢筋混凝土无腹钢筋梁的抗剪承载力进行研究。首先对无腹筋简支梁抗剪承载力的机理进行了详细的阐述,其次以协调压力场理论为基础,采用桁架拱模型,考虑了拉应变存在条件下混凝土抗压强度的软化、剪跨比以及纵向钢筋配筋率的影响,分别对集中荷载和均布荷载作用下的矩形截面无腹筋简支梁的抗剪承载力进行了理论推导。并把得到的相应计算公式与国内外相关的试验数据进行了比较。研究结果适用于深梁、短梁和浅梁的抗剪承载力计算,并与试验资料吻合且偏于安全。

Combined with the revision of Chinese Code for Design of Concrete Structures (GBJ 10-89), the shear capacity of rectangular beams without web was studied. The mechanisms of shear strength adopted by the alien and native codes were introduced. Based on the compatibility compression-field theory and the truss-strut model, a thorough investigation of the shear strength of the simply supported rectangular beams under concentrated forces and uniformly distributed load was presented, which takes into account the main factors affecting the shear capacity such as the strength of concrete, longitudinal reinforcement ratio and shear span ratio. The theoretical formulas can be the same with the calculation of normal beams, short beams and deep beams and agree well with experimental tests.