横向预应力混凝土梁抗剪性能研究

通过4根加配横向预应力筋的钢筋混凝土梁和1根普通钢筋混凝土梁的对比试验,初步考察了横向预应力筋对提高钢筋混凝土梁抗剪性能的良好效果.研究结果表明:(1)加配横向预应力筋并施加适当预应力之后,钢筋混凝土梁的抗剪承载力提高70%以上,即使在不施加预应力的情况下,梁的抗剪承载力也约有40%的增长;(2)在横向预应力筋的总截面面积一定的情况下,采用直径较小的横向预应力筋和较小的间距,更有助于改善钢筋混凝土梁的破坏形态.

Research on Shear Capacity of Transversely Prestressed Concrete Beams

Four transversely prestressed concrete beams were tested,and the experimental results were compared with those of one ordinary reinforced concrete beam.The positive influence of transverse prestressing bars on shear capacity of reinforced concrete beams was demonstrated primarily.Test results show that(a)comparing with ordinary reinforced concrete beams,the shear capacity of transversely prestressed concrete beams Call be increased by 70%;even in the condition that the transverse prestressing bars are not pre-tensioned,an increase of 40% in the shear capacity can be obtained.(b)For a given total areas of transverse prestressing bars,the bars with smaller diameter and smaller spacing can improve the mode of failure of beams.