剪切斜裂缝发生后钢筋混凝土梁抗剪加固实验研究

STRENGTHENING AND TEST STUDY RESULT OF CRACKED REINFORCED CONCRETE BEAMS UNDER SHEAR

为了研究已有剪切斜裂缝对钢筋混凝土梁抗剪加固效果的影响，探讨带斜裂缝钢筋混凝土梁的有效抗剪加固构造措施，先后采用有间隔外包钢箍及全面包裹薄钢板的方法对一批已出现剪切斜裂缝的梁进行加固后静载破坏试验。结果表明在几乎同样的耗钢量条件下采用全面包裹薄钢板的方法能显著提高裂缝梁的承载能力及刚度、并使其破坏形态发生改变。

To study the effect of diagonal shear crack on the strengthening results of reinforced concrete beams and explore an effective strengthening constructional measures on reinforced concrete beams, strengthening methods such as binding hoop reinforcement outside the beam only and completely wrapping up the beam with thin steel plates were used to strengthen cracked beams. Loading test results show that beams have been completely wrapped up with thin steel plates show stronger load bearing capacity and better deforming ability as well as a completely different failure mode in spite of almost the same material expense.