Flexural Strengthening of Cracked RC Column Using NFRP Confinement Under Reversed Cyclic Loading

DOI

10.2991/978-94-6463-952-0_2How to use a DOI?

Keywords

Flexure Failure; Cyclic Load; Column Reinforcement; Injection; NFRP; Abaca Fiber

Abstract

In this study, columns that experienced flexural failure were reinforced using a composite cement paste injection method with a mixture of diatomaceous earth and external reinforcement with polymer-reinforced natural fiber (NFRP) coating made from abaca fiber and resin. The test objects used in this study were reinforced concrete columns designed to fail in flexure when loaded, with dimensions of 200 x 200 x 600 mm, consisting of 3 columns, using 8D13 mm main reinforcement and Ø10- 75 mm tie reinforcement. The load was applied in the form of axial load and cyclic load with a drift ratio of two cycles per displacement based on FEMA 461-2007 to assess the maximum load capacity, ductility, initial stiffness, and absorbed energy. The results showed that column F-1, which was used as a control specimen, failed at a deformation of 24 mm with a maximum load capacity of 102 kN. Meanwhile, column F-2 failed at a deformation of 22 mm with a maximum capacity of 89 kN. Column F-3, reinforced with composite material injection and NFRP coating, showed significant improvement, with a maximum column capacity of 116 kN, an increase of 13.5%, flexibility increased by 10%, and energy dissipation increased by 129%, almost double that of the control specimen, but initial stiffness during the first cycle decreased by 38.5%. This occurred because the column reinforcement had already undergone deformation prior to strengthening. The unreinforced column reached 22 cycles before failure, while the reinforced column reached 26 test cycles. The reinforcement also played a role in slowing crack growth and maintaining the structural integrity of the column during testing. Therefore, the use of NFRP has been proven to be an effective method of increasing the resistance of reinforced concrete columns to cyclic loads, thus providing an efficient reinforcement solution in structural rehabilitation.

Copyright

© 2025 The Author(s)

Open Access

Open Access This chapter is licensed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License (http://creativecommons.org/licenses/by-nc/4.0/), which permits any noncommercial use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license and indicate if changes were made.

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TY  - CONF
AU  - Safril Muhamad Erwin Hidayat
AU  - Muttaqin Hasan
AU  - Taufiq Saidi
PY  - 2025
DA  - 2025/12/26
TI  - Flexural Strengthening of Cracked RC Column Using NFRP Confinement Under Reversed Cyclic Loading
BT  - Proceedings of the 6th Aceh International Symposium on Civil Engineering (AISCE 2025)
PB  - Atlantis Press
SP  - 3
EP  - 19
SN  - 2352-5401
UR  - https://doi.org/10.2991/978-94-6463-952-0_2
DO  - 10.2991/978-94-6463-952-0_2
ID  - Hidayat2025
ER  -