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本文根据不同预应力度和剪跨比的8根无箍筋矩形截面梁,12根有箍筋矩形截面梁及8根有箍筋T形截面梁的试验结果,分析了预应力度和剪跨比对无箍筋混凝土梁抗剪强度的影响,提出了计算无箍筋梁混凝土抗剪强度计算的公式,并在此基础上提出了配有箍筋的梁(对于T形截面梁暂不考虑受压翼缘的有利影响)抗剪强度的计算方法和公式。最后,将本文建议的公式同试验结果以及国内一些试验报告进行比较。
In this paper, based on the test results of 8 unstirred rectangular cross-section beams with different prestressing degree and shear span ratio, 12 test beams with stirrups and 8 T-section beams with stirrups, the prestress degree and the shear span are analyzed. Comparing the shear strength of concrete beams without stirrups, the formula for calculating the shear strength of the stirrup-free concrete is proposed, and on this basis, the beam with stirrups is proposed (for T-section beams, no consideration is given. The favorable influence of the pressure flange) Calculation method and formula of shear strength. Finally, the formula proposed in this paper is compared with the test results and some domestic test reports.