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本文根据试验结果,论述了钢筋混凝土T梁在移动荷载作用下,剪跨比对抗剪性能的影响,提出了作用剪力折减系数φ的计算式。在每根试验梁上,设置有对称的两个抗剪强度削弱的试验区。试验结果表明,试验区与加载点或支反力作用点之间的相对位置,对试验区的抗剪性能有着明显的影响,这是由于靠近加载点或支反力作用点附近产生的局部垂直压应力σ_y的影响结果。这种有利作用,在梁的抗剪强度设计中应当予以考虑。通过第二次加载试验,研究了交叉斜裂缝对梁的抗剪性能的影响。
Based on the experimental results, this paper discusses the influence of the shear-span ratio on the shear-resistance performance of reinforced concrete T-beams under the action of moving loads, and proposes a formula for calculating the effective shear reduction factor φ. On each test beam, there are symmetrical two test areas with weakened shear strength. The test results show that the relative position between the test area and the point of loading or the reaction point of the support has a significant impact on the shear resistance of the test area, which is due to the local vertical proximity to the loading point or the point of action of the lateral reaction force. The effect of compressive stress σ_y. This beneficial effect should be considered in the design of the shear strength of beams. Through the second loading test, the influence of cross oblique cracks on the shear resistance of the beam was studied.