钢筋混凝土梁剪跨区段应力状态的研究

The Study of The Stress Distribution of Reinforced Concrete Beams in The Shear Span

通过五根受二点对称集中荷载作用下简支梁的抗剪强度试验,采用梁表面贴光敏薄片和纵筋连续贴电阻应变片的测试手段,把贴片光弹分析推广到混凝土的塑性应变中,得到了剪跨区段的应力、应变分布图形,特别是临界抗剪垂直截面(过临界斜裂缝顶点的垂直截面)上混凝土受压区的应力、应变图形。为进一步提出计算假定、用极限平衡原理来解斜截面抗剪强度问题打下了良好的基础。

A test was made on five simply supported beams subjected to two concentrative loads. The means of sticking some strain gauges continuously on the longitudinal rod was used. By using the method of photo-elasticity, sticking the photosensitive sheets on the side of the beam, the photo-elastic analysis was extended to the plastic strain of concrete. The strain and stress figures in the shear span, particularly on the perpendicular section of critical shear resistance (perpendicular section passed the top point of critical inclined crack), were obtained. Which provided a good basis for the solution to shear strength of beams with the principle of ultimate equilibrium.