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本文通过二次受力钢筋砼简支迭合梁斜截面抗剪强度的试验研究,探讨了该种梁斜截面受力性能及内力重分布的规律及其对抗剪强度的影响。提出该梁与一次受力的对比梁相比,存在着预制梁砼“剪应力超前”及后浇砼“剪应力迟后”的现象.随着内力重分布的发展,两种梁间的差异逐渐减少,两种梁都达到极限强度时,差异基本消失。这从机理上解释了“迭合梁的抗剪强度比相应整浇梁不会降低”的这一客观现象。在此基础上,本文提出了简支迭合梁斜截面抗剪强度的计算公式。
In this paper, through the experimental study on the shear strength of the inclined section of the simply supported double-compression reinforced concrete beams, the influence of the oblique section mechanical properties and the redistribution of internal forces and the effect of the shear strength are discussed. It is proposed that the beam has “shear stress ahead” and post-cast “delayed shear stress” phenomenon compared to the first time comparison beam. With the development of internal force redistribution, the difference between the two beams Gradually decreased, the difference disappeared when both beams reached the ultimate strength. This mechanism explains the objective phenomenon of “the shear strength of the laminated beam is not lower than that of the corresponding cast-in-place beam”. On this basis, this paper proposes the calculation formula for the shear strength of simply supported composite beams.