Experimental Investigation on the Rehabilitation of RC Flat Slabs Using CFRP Sheets to Enhance Punching Shear Capacity

IF 3.1 3区工程技术 Q2 CONSTRUCTION & BUILDING TECHNOLOGY

Buildings Pub Date : 2024-01-08 DOI:10.3390/buildings14010153

Mohammed Qusay Abdul Sahib, Reza Aghayari, Mohammad Javad Moradi, M. Tahamouli Roudsari

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Abstract

In this paper, the feasibility of strengthening a flat column–slab connection within the carbon fiber reinforced polymer (CFRP) has been investigated through experimental study. The experimental program includes a set of nine reinforced concrete flat slab specimens. Three unaltered specimens served as control slabs, while an additional six samples were strengthened with various CFRP configurations to enhance their shear capacity. The strain distribution, ductility, punching shear resistance, stiffness, and crack formation were studied. The result of experimental studies showed that in the direct method of strengthening in which two layers of unidirectional CFRP sheets were employed in two opposite directions, the ultimate punching shear resistance improved by 64%, 44.7%, and 15.3%, with respect to the location of the column connection, as compared with the control specimens. In the case of using one layer of unidirectional CFRP strips, the punching shear resistance was enhanced by approximately 16% and 39%, considering the configuration of CFRP sheets and the amount of strengthened and adhesive layers used. Following the outcomes of this research, the application of CFRPs in improving the resistance capacity of flat slabs against the punching shear is considerable. The reported outcomes were compared with the latest provisions of ACI to show the efficiency of the presented strengthening. Finally, a parametric study was performed assuming different loading locations to assess the effect of the loading region on the response of RC slabs. Results indicate that approaching the loading location toward the RC slab supports results of an increase in the load-bearing capacity and a reduction in the ductility of the RC slab.

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使用 CFRP 片材修复钢筋混凝土平板以提高冲剪切力的实验研究

本文通过实验研究了在碳纤维增强聚合物（CFRP）内加固平面柱-板连接的可行性。实验项目包括一组九个钢筋混凝土平板试样。三个未作改动的试样作为对照板，另外六个试样则采用不同的 CFRP 配置进行加固，以提高其抗剪能力。实验研究了应变分布、延展性、抗冲剪性、刚度和裂缝形成。实验研究结果表明，在两个相反方向使用两层单向 CFRP 片材的直接加固方法中，与对照试样相比，极限抗冲剪能力在柱连接位置上分别提高了 64%、44.7% 和 15.3%。在使用一层单向 CFRP 带材的情况下，考虑到 CFRP 板材的配置以及所使用的强化层和粘合剂层的数量，冲剪阻力分别提高了约 16% 和 39%。根据这项研究的结果，CFRP 在提高平板抗冲剪能力方面的应用是相当可观的。报告结果与 ACI 的最新规定进行了比较，以显示所提出的加固方法的效率。最后，假定不同的加载位置进行了参数研究，以评估加载区域对 RC 板响应的影响。结果表明，加载位置接近 RC 板支撑时，RC 板的承载能力会增加，延展性会降低。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Buildings Multiple-

CiteScore

3.40

自引率

26.30%

发文量

1883

审稿时长

11 weeks

期刊介绍： BUILDINGS content is primarily staff-written and submitted information is evaluated by the editors for its value to the audience. Such information may be used in articles with appropriate attribution to the source. The editorial staff considers information on the following topics: -Issues directed at building owners and facility managers in North America -Issues relevant to existing buildings, including retrofits, maintenance and modernization -Solution-based content, such as tips and tricks -New construction but only with an eye to issues involving maintenance and operation We generally do not review the following topics because these are not relevant to our readers: -Information on the residential market with the exception of multifamily buildings -International news unrelated to the North American market -Real estate market updates or construction updates