Experimental study on the effectiveness of strengthening reinforced concrete slab-column connections using CFRP sheets

Journal of Science and Technology in Civil Engineering (STCE) - HUCE Pub Date : 2023-09-26 DOI:10.31814/stce.huce2023-17(3)-04

Pham Xuan Dat, Nguyễn Trung Hiếu

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Abstract

This paper presents an experimental study on the effect of externally bonded carbon fiber-reinforced polymer (CFRP) sheets on the punching shear behavior of interior slab-column connections. Two square slabs with a concentric column were fabricated, measuring 1200 ´ 1200 ´ 80 mm for the slabs and 200 ´ 200 mm for the column. One specimen served as an unstrengthened control specimen, while the other specimen was strengthened using CFRP sheets. The specimens were simply supported along their edges and subjected to punching tests, with the vertical load applied through the central column. The experimental results revealed that the application of CFRP sheets significantly improved the performance of the slab-column connections. The strengthened slab exhibited a 16.3% increase in punching capacity compared to the control specimen. Additionally, a calculation was conducted to determine the punching shear strength of the test specimens, taking into account the interaction between shear and flexural capacities in a two-way flat slab. This calculation provided a deeper understanding of the impact of CFRP sheet strengthening on the enhancement of the strength of the slab-column connections.

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使用 CFRP 片材加固钢筋混凝土板柱连接有效性的实验研究

本文介绍了外部粘接碳纤维增强聚合物（CFRP）板材对内部板柱连接的冲剪行为影响的实验研究。我们制作了两块带同心柱的方形板，板的尺寸为 1200 ´ 1200 ´ 80 毫米，柱的尺寸为 200 ´ 200 毫米。其中一个试样作为未加固的对照试样，另一个试样则使用 CFRP 片材进行加固。试样沿边缘得到简单支撑，并进行冲压试验，垂直荷载通过中心柱施加。实验结果表明，CFRP 片材的应用大大改善了板柱连接的性能。与对照试样相比，加固板的抗冲击能力提高了 16.3%。此外，考虑到双向平板中抗剪和抗弯能力之间的相互作用，还进行了计算，以确定试样的冲剪强度。通过计算，可以更深入地了解 CFRP 片材加固对提高板柱连接强度的影响。

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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Journal of Science and Technology in Civil Engineering (STCE) - HUCE

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