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Investigation of parameters affecting direct shear behavior of concrete strengthened with CFRP laminate
Journal of Building Engineering ( IF 6.4 ) Pub Date : 2020-05-15 , DOI: 10.1016/j.jobe.2020.101480
Azad A. Mohammed , Omed A. Hagi Fattah

In this paper, the influence of important parameters affecting shear transfer strength and deformation of concrete strengthened externally using CFRP laminate has been investigated. Parameters investigated were the internal steel reinforcement, CFRP layers, existence of preloading, and existence of tension on shear plane. For the latter one, a special type of push-off specimen has been developed, different from those used by the others. This specimen can be named a modified pair push-off specimen and was found to be more convenient compared with the other specimens used. Results showed that there is a relatively high shear strength enhancement of non-reinforced concrete strengthened with CFRP laminate, reaching 91% when two CFRP layers are used for strengthening. Shear enhancement ratio was found to reduce with the increase of the internal steel ratio, of an enhancement between 8% and 29%. Effect of moderate preloading on concrete was found not important on the residual shear strength. There is a good chance to strengthen concrete subjected to shear and tension for shear enhancement between 22% and 157%. A new proposal was developed for the prediction of direct shear capacity of strengthened concrete, essentially depends on an accurate assessment of FRP laminate contribution to enhance shear.



中文翻译:

CFRP层合板加固混凝土直接剪切性能的参数研究

本文研究了重要参数对使用CFRP层压板进行外部加固的混凝土的剪切传递强度和变形的影响。研究的参数是内部钢筋,CFRP层,预紧力的存在以及剪切面上的张力。对于后者,已经开发了一种特殊类型的下推样本,与其他样本不同。该标本可以被称为改进的对下推标本,与其他标本相比,发现更方便。结果表明,用CFRP层压板加固的非钢筋混凝土的抗剪强度有相对较高的提高,当使用两层CFRP层进行加固时,抗剪强度达到91%。发现剪切增强率随内部钢率的增加而降低,增强率在8%至29%之间。发现适度的预紧力对混凝土的影响对残余抗剪强度并不重要。有一个很好的机会来加固承受剪切力和拉力的混凝土,以使剪切力提高22%至157%。提出了一项新的建议来预测钢筋混凝土的直接剪切能力,这主要取决于对FRP层压板对增强剪切作用的准确评估。

更新日期:2020-05-15
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