【摘要】 目前钢筋混凝土梁抗剪承载力公式主要是根据试验回归得到的 ,而大多数试验的破坏是在纵向钢筋没有屈服的情况下发生的 ,与正截面设计纵向钢筋屈服的假设不符 ,由此得到的抗剪承载力公式是否具有足够的可靠度尚需进一步研究 .为此 ,利用有限元方法 ,根据塑性理论 ,考虑混凝土单元开裂后的性能改变 ,以集中荷载作用下的钢筋混凝土矩形截面梁为例 ,分析其纵向钢筋量对抗剪设计所需要的箍筋量的影响 ,并对纵向钢筋屈服后无腹筋梁的抗剪承载力影响因素进行新的探索 .更多还原

【Abstract】 Current formulas for RC beams shear strength are mainly based upon tests. However, for most of the tests, longitudinal reinforcement had not yet yielded when the beam was crushed. This does not conform to the assumption that longitudinal reinforcement is yielding in bending design. So the reliability of shear strength formulas should be further investigated. The finite element method based on plasticity theory was applied and the change in concrete behavior after cracking is considered. By analysis of a reinforced concrete simple beam with rectangle section under concentrated load, the influence of area of longitudinal reinforcement on area per unit length of stirrup reinforcement for design is established. The influence factors of shear strength for RC beams without web reinforcement are present.更多还原