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本文通过对二次受力钢筋砼连续迭合梁斜截面受力性能的试验研究,探讨了其斜截面二次受力特点,分析了截面剪应力重分布的过程。指出,随截面剪应力重分布的发展,该种梁与相应一次受力对比梁的差异逐渐减小,至极限破坏时,差异基本消失。从而从机理上解释了“迭合梁抗剪强度比相应整浇梁不会降低”这一尚未研究清楚的客观现象。在此基础上,本文提出了斜截面抗剪强度计算公式。
In this paper, through the experimental study on the mechanical behavior of the inclined cross-section of a continuous reinforced beam with secondary force reinforced concrete, the secondary stress characteristics of the oblique section are discussed, and the process of redistribution of the shear stress of the section is analyzed. It is pointed out that with the development of shear stress redistribution in the section, the difference between the beam and the corresponding primary force comparison beam gradually decreases, and when the ultimate failure is reached, the difference disappears. From the mechanism, it is explained that the objective phenomenon of “the shear strength ratio of the laminated beam is not reduced compared to the corresponding cast-in-place beam” is not yet studied. On this basis, this paper proposes a formula for calculating the shear strength of oblique sections.