含石英砂胶层粘钢加固混凝土梁钢板受力试验研究

Experimental Study on Normal Stress of Concrete Beams Strengthened with Quartz Sand and Bonded Steel

为了研究粘钢加固混凝土梁界面受力情况,优化界面应力传递效果,采用一种新的施工工艺:通过在胶层中加入石英砂,对钢板厚度、胶层厚度和石英砂厚度3个因素进行组合,采用正交试验方法确定具有代表性的试件梁,进行试验加载,并分析混凝土梁底面钢板的受力情况。结果表明,在胶层中加入石英砂有助于界面应力的有效传递,使得钢板更充分发挥其作用。最后,在实际工程应用中,对于石英砂的用量,建议取石英砂与胶的体积比0.50~0.67。

Thanks to the advantages of convenient construction, reliable reinforcement effect and obvious economic benefits, the method of pasting steel plate reinforced concrete beams has been widely used in the field of structural reinforcement and engineering transformation. A new construction process was adopted in the experiment: by adding quartz sand to the glue layer, the three factors of steel plate thickness, rubber layer thickness and quartz sand thickness were combined. The representative experiment beams which were loaded were determined by orthogonal test method, and then the interface stress of the steel plate on the bottom of the concrete beams was analyzed. The results show that the addition of quartz sand in the glue layer contributes to the effective transmission of interfacial stress, so that the steel plate can fully exert its effect. Finally, suggestions are proposed for the dosage of quartz sand in practical engineering application.