RPC钢筋网加固负载RC梁抗剪性能试验研究

Experimental Study on Shear Behavior of Loaded RC Beams Strengthened with RPC Steel Mesh

目的 探究活性粉末混凝土(RPC)钢筋网对负载下钢筋混凝土(RC)梁抗剪性能的加固效果。方法 设计制作了5根RPC钢筋网四面加固梁和1根对比梁;通过抗剪试验,研究剪跨比和配箍率对加固梁抗剪性能的影响。结果 在不同参数下,各加固构件均发生剪压破坏,加固梁抗剪承载力最大可提高2.4倍,破坏过程表现出良好的延性。加固层和原始构件共同工作性能良好,未出现层间滑移现象。较大的剪跨比(2.0~3.0)和较小的配箍率(0.14%~0.28%)会降低加固梁的抗剪承载力。结论 RPC钢筋网加固方法能显著地提高钢筋混凝土梁的抗剪承载力和变形能力。基于试验结果,提出了负载下加固RC梁的抗剪承载力理论模型和计算公式,计算结果与试验值吻合较好,可为该加固技术在实际工程中应用提供参考。

In order to study the shear behavior of loaded concrete(RC) beams strengthened with reactive powder concrete(RPC)steel mesh.Six concrete beams were designed, five of which were strengthened with reactive powder concrete steel mesh, and one of which was not strengthened as a comparative test beam.Through the test, the effects of the shear span ratio and hoop ratio on the shear behavior of the Reinforced RC beams are analyzed.The results show that under different parameters, shear failure occurred in all beams.The shear capacity of the strengthened beam can be increased by 2.4 times, the failure process expressed good ductility.The reinforcement layer and the original component work well together, and there is no slippage between them.A larger shear span ratio(2.0 ~ 3.0)and a smaller hoop ratio(0.14% ~ 0.28%)reduced the shear capacity of the reinforced beam.The RPC steel mesh can significantly improve the shear capacity and deformation capacity of strengthened beams.Based on the test results, we proposing a theoretical model and establish a formula for the shear capacity of loaded beams.The calculated results are in good agreement with the test values, which can provide a reference for the application of the reinforcement technology in practical engineering.