钢筋混凝土直剪性能的几种加固方法研究

Study on several strengthening methods of the shear transfer capacity of RC concrete

本文介绍钢筋混凝土直剪性能的几种加固方法和效果,加固方法包括垂直直剪面黏贴CFRP、与直剪面斜向黏贴CFRP、以及钢板锚固。研究发现,垂直直剪面黏贴CFRP,加固后钢筋混凝土的直剪承载力随CFRP加固率的增加而增大,提高范围为6%~34%。与直剪面斜向黏贴CFRP,加固钢筋混凝土最佳黏贴角度约70°,提高范围为28%~51%。钢板锚固通过改变直剪破坏面的位置达到加固目的,对于低配筋钢筋混凝土,直剪承载力提高约45.2%。

Three methods to improve the shear transfer capacity of RC concrete were developed and their strengthening effects were compared.The methods include pasting the CFRP strips perpendicular or oblique to the direct shear plane and the method of anchoring the steel plates.Test results found that,for the method of pasting the CFRP strips perpendicular to the direct shear plane,the shear transfer resistance increased with the CFRP ratios increase and the shear resistance was improved in a range of 6%~34%.For the method of pasting the CFRP strips oblique to the direct shear plane,the optimum angle was about 70°,and the shear resistance was improved in a range of 28%~51%.The method of anchoring the steel plates was implemented by change the location of the direct shear plane,and the shear resistance was improved by about 45.2% for low reinforced concrete.