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修正压力场理论认为有腹筋构件的受剪承载力由沿裂缝面传递的剪应力和穿过裂缝面的箍筋提供,忽略了受压区承担的剪力,受剪承载力计算结果偏小。基于修正压力场理论,根据钢筋混凝土受弯构件的剪切破坏机理,考虑上部受压区混凝土和下部受拉区骨料咬合力及箍筋共同提供受剪承载力,提出截面受剪承载力计算方法。与所收集的国内外有腹筋梁的275个试验结果的比较表明:采用本文方法计算的受剪承载力与试验结果的变异性较小,可用于钢筋混凝土梁的抗剪分析。
Correction of pressure field theory suggests that the shear capacity of web members is provided by the shear stress transmitted along the fracture surface and the stirrup passing through the fracture surface. The shear stress of the compression zone is neglected, and the calculated result of shear capacity is small. Based on the modified pressure field theory, according to the shear failure mechanism of RC bent members, considering the billet force of the aggregate in the upper compression zone and the lower tension zone and the shear strength, the shear capacity of the cross-section is calculated method. The comparison with the 275 test results of the domestic and international web-reinforced beams shows that the calculated shear capacity and the test results obtained by this method have less variability and can be used in the shear analysis of reinforced concrete beams.