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采用内嵌预应力加固法张拉系统,提出开槽、加固和张拉螺旋肋钢丝、填胶的施工工艺,并在此基础上,进行了10个内嵌预应力螺旋肋钢丝加固混凝土梁试件的试验研究。结果表明,采用内嵌预应力螺旋肋钢丝加固法,能够较好地改善被加固钢筋混凝土梁的整体工作性能,大幅度提高其开裂荷载,对屈服荷载和极限荷载也有明显的改善。随加固量及预应力水平不同被加固梁开裂荷载提高幅度为72.6%～321.26%,屈服荷载提高幅度为6.19%～99.09%,极限荷载提高幅度为46.04%～135.27%,加固效果明显。该加固方法能够有效改善加固梁的延性和安全性能,梁试件刚度提高明显,对裂缝的产生和发展都有约束作用,具有良好的加固效果,同时螺旋肋钢丝的高强性能也得到了充分发挥。
Based on the prestressed reinforced prestressing tensioning system, the construction technology of grooving, reinforcing and tensioning spiral ribbed steel wire and plastic filling was put forward. On the basis of this, ten embedded prestressed spiral ribbed steel wire reinforced concrete beam test Piece of experimental research. The results show that the use of embedded prestressed spiral ribbed steel wire reinforcement method can better improve the overall performance of reinforced concrete beams, greatly improve the cracking load, the yield load and ultimate load are also significantly improved. With the increase of the amount of reinforcement and the level of prestressing, the cracking load of reinforced beams is increased by 72.6% ~ 321.26%, the yield load is increased by 6.19% ~ 99.09%, the ultimate load is increased by 46.04% ~ 135.27%, and the reinforcement effect is obvious. The strengthening method can effectively improve the ductility and safety performance of the reinforced beam. The rigidity of the beam specimen increases obviously, which has a restraining effect on the generation and development of the crack, has a good reinforcing effect, and the high-strength performance of the spiral ribbed steel wire has also been fully utilized .