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本文根据23根承受均布荷载的弯筋梁和无腹筋梁的试验成果,对均载梁的斜裂缝种类、破坏形态、破坏斜截面的位置和影响抗剪强度的因素进行了分析,并给出了弯筋梁抗剪强度的建议公式:建议公式一为适用于均布荷载梁和集中荷载梁的通用公式;建议公式二则适用于承受均布荷载的低配筋弯筋梁。对于无腹筋梁,两式也可应用,只要在弯筋梁公式中不计弯筋的抗剪强度项即可。为了保证斜截面抗弯强度,笔者认为只要满足本文建议的构造要求,就可不必进行斜截面强度计算。
Based on the test results of 23 bent and non-stretched beams subjected to uniform loads, the types of oblique cracks, the failure modes, the position of failure angles and the factors affecting the shear strength of the uniformly loaded beams are analyzed and given. The proposed formula for the shear strength of curved beam is proposed. It is suggested that formula one is a general formula applicable to uniformly distributed load beam and concentrically loaded beam; and the proposed formula two is applicable to low-shaping curved beam with uniformly distributed load. For non-stretched beams, the two types can also be applied, as long as the shear strength of bending bars is not included in the curved beam formula. In order to ensure the bending strength of the oblique section, the author thinks that it is not necessary to calculate the oblique section strength as long as the construction requirements proposed in this paper are satisfied.