预应力斜箍筋加固RC梁受剪性能试验研究

对6根预应力斜箍筋加固混凝土简支梁和1根对比梁进行了受剪性能试验。结果表明,该加固方法对混凝土梁的斜截面开裂荷载和极限荷载均有不同程度的提高,对梁斜裂缝宽度有一定的限制作用。基于桁架-拱模型理论,推导出预应力斜箍筋加固混凝土梁的理论计算公式。根据试验实测数据的回归分析,得到预应力斜箍筋加固混凝土梁在不同加固工况下预应力箍筋贡献的抗剪计算公式,计算结果与试验值吻合较好。

EXPERIMENTAL STUDY ON SHEAR BEHAVIORS OF REINFORCED CONCRETE BEAMS STRENGTHENED WITH PRE-STRESSED INCLINED STIRRUPS

Based on the experiment of six simply supported reinforced concrete beams strengthened with pre-stressed inclined stirrups and one contrastive beam,the failure process was observed.The results indicate that the strengthened way used in this paper increased the shear bearing capacity of these specimens: crack load and limit load of the beam has been increased in different degree.And the strengthened beams’shear-crack width was certainly limited.The strut-arch model is used to study the pre-stressed inclined stirrups strengthened beams,and a formula is presented.The formulas for calculating cracking load and shear capacity of reinforced concrete beams with different strengthening cases strengthened by pre-stressed inclined stirrups are proposed through regression analysis of experiment data,and the calculated results coincidence well with the experiment results.