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本文通过41根直接加载和间接加载钢筋混凝土简支梁抗剪对比试验及对现有资料的分析,说明了间接加载梁的抗剪强度比直接加载梁降低0～63.4%,降低的幅度主要随剪跨比、间接荷载沿梁高作用的位置以及配箍率而变化,提出了计算间接加载梁抗剪强度的经验公式。本文对现行设计规范(TJ10-74)关于附加横向钢筋的规定作了分析,即:在一般情况下附加横向钢筋能够完全补偿抗剪强度的降低,在小剪跨时附加吊筋梁尚降低11.8～17.3%,且吊筋对于控制裂缝的开展不能充分发挥作用;在部分情况下还有潜力。此外,本文还提出了改进设计方法的意见。
In this paper, through 41 shear load comparison tests of direct-concrete and indirect-loaded reinforced concrete simple-supported beams and the analysis of existing data, it is shown that the shear strength of indirect-loaded beams is lower by 0-63.4% than that of direct-loaded beams. The shear span ratio, the position of the indirect load along the height of the beam, and the variation of the hoop loading rate were varied, and an empirical formula for calculating the shear strength of the indirectly loaded beam was proposed. This article analyzes the provisions of the current design specification (TJ10-74) on the addition of transverse reinforcement, that is, under normal circumstances additional transverse reinforcement can fully compensate for the reduction in shear strength, and the additional reinforcement beam is reduced by 11.8 for small shear spans. ~17.3%, and the lifting ribs do not fully function in controlling the cracks; in some cases there is still potential. In addition, this article also proposes to improve the design method.