无腹筋钢筋混凝土受弯构件基于修正压力场理论的受剪计算

为解释无腹筋钢筋混凝土受弯构件的受剪破坏机理，并反映尺寸效应对无腹筋受弯构件受剪强度的影响，在修正压力场理论基础上，对钢筋混凝土构件受剪破坏做了进一步研究，提出沿受弯构件斜裂缝表面平均剪应力的计算公式，并考虑混凝土构件的尺寸效应提出抗剪强度简化计算公式。与国内外无腹筋梁的512个试验结果比较表明，采用提出的斜裂缝表面平均剪应力公式按修正压力场理论计算的受剪承载力及按文中简化公式计算的受剪承载力与试验结果比值的变异性很小，可用于无腹筋钢筋混凝土梁的受剪分析和设计。

Shear strength of reinforced concrete members without stirrups based on modified compression field theory

To explain the shear failure mechanism of reinforced concrete flexural members without stirrups and to reflect the influence of size effect on shear strength of such members, a further research on shear failure of reinforced concrete members was conducted based on the modified compression field theory. An expression of the average shear stress across the diagonal crack was derived and a simplified equation of shear strength considering the size effect in shear was developed. The obtained equations were verified with extensive sets of experimental data from different source (512 test data in total). It was found that comparing with the test data, the variation coefficients were small for the shear strength calculated using the derived average shear stress across the crack based on modified compression field theory and using the simplified expressions. So it is suitable for shear analysis and design of reinforced concrete beams without stirrups.