Static and Dynamic Behavior of Circularized Reinforced Concrete Columns Strengthened with Hybrid CFRP

Authors

  • Z. H. Abdulghafoor Department of Civil Engineering, University of Baghdad, Iraq
  • H. A. Al-Baghdadi Department of Civil Engineering, College of Engineering, University of Baghdad, Iraq
Volume: 12 | Issue: 5 | Pages: 9336-9341 | October 2022 | https://doi.org/10.48084/etasr.5162

Abstract

In this study, three strengthening techniques, near-surface mounted NSM-CRFP, NSM-CFRP with externally bonding EB-CFRP, and hybrid CFRP with circularization were studied to increase the seismic performance of existing RC slender columns under lateral loads. Experimentally, 1:3 scale RC models were studied and subjected to both lateral static load and seismic excitation. In the dynamic test, a model was subjected to El Centro 1940 NS earthquake excitation by using a shaking table. According to the test results, the strengthening techniques showed a significant increase in load carrying capacity, of about 86.6%, and 46.6%, for circularization and NSM-CFRP respectively, of the reference unstrengthened columns. On the other hand, columns strengthened with hybrid NSM-CFRP and EB-CFRP showed a different failure mode. Dynamically, the lateral drift was decreased by about 75%, 47%, and 49% for earthquake amplitudes of 0.05g, 0.15g, and 0.32g respectively. Finally, it was concluded, depending on the static and dynamic analyses, that the circularization process showed a significant increase in lateral load-bearing capacity.

Keywords:

Circularization, strengthening, CFRP, NSM, dynamic, slender column

Downloads

Download data is not yet available.

References

Seismic Evaluation and Retrofit of Existing Buildings. American Society of Civil Engineers, 2014.

M. Saadi and D. Yahiaoui, "The Effectiveness of Retrofitting RC Frames with a Combination of Different Techniques," Engineering, Technology & Applied Science Research, vol. 12, no. 3, pp. 8723–8727, Jun. 2022, https://doi.org/10.48084/etasr.4979. DOI: https://doi.org/10.48084/etasr.4979

M. Fahim, F. Alam, H. Khan, I. U. Haq, S. Ullah, and S. Zaman, "The Behavior of RC Beams Retrofitted with Carbon Fiber Reinforced Polymers (CFRP)," Engineering, Technology & Applied Science Research, vol. 12, no. 3, pp. 8701–8706, Jun. 2022, https://doi.org/ DOI: https://doi.org/10.48084/etasr.4926

48084/etasr.4926.

K. Soudki and T. Alkhrdaji, "Guide for the Design and Construction of Externally Bonded FRP Systems for Strengthening Concrete Structures (ACI 440.2R-02)," in Structures Congress 2005, Apr. 2012, https://doi.org/10.1061/40753(171)159. DOI: https://doi.org/10.1061/40753(171)159

V. L. Doan, "Behaviour of shape-modified columns confined with carbon fibre-reinforced polymer under eccentric loading," M.S. thesis, University of Wollongong, Wollongong , Australia, 2013.

Z. Yan, "Shape modification of rectangular columns confined with FRP composites," Ph.D. dissertation, University of Utah, Salt Lake City, UT, USA, 2005.

M. Nuruzzaman, J. O. Camargo Casimiro, and P. K. Sarker, "Fresh and hardened properties of high strength self-compacting concrete using by-product ferronickel slag fine aggregate," Journal of Building Engineering, vol. 32, Nov. 2020, Art. no. 101686, https://doi.org/ DOI: https://doi.org/10.1016/j.jobe.2020.101686

1016/j.jobe.2020.101686.

J. Abd and I. K. Ahmed, "The Effect of Low Velocity Impact Loading on Self-Compacting Concrete Reinforced with Carbon Fiber Reinforced Polymers," Engineering, Technology & Applied Science Research, vol. 11, no. 5, pp. 7689–7694, Oct. 2021, https://doi.org/ DOI: https://doi.org/10.48084/etasr.4419

48084/etasr.4419.

C. Maheswaran, S. Prakash Shanmugam, V. Mahadik, and A. Sharma, "Experimental and Numerical Studies on Effectiveness of Hybrid FRP Strengthening on Behavior of RC Columns under High Eccentric Compression," Journal of Bridge Engineering, vol. 24, no. 6, Jun. 2019, https://doi.org/10.1061/(ASCE)BE.1943-5592.0001420. DOI: https://doi.org/10.1061/(ASCE)BE.1943-5592.0001420

R. Abokwiek, "Strengthening of Reinforced Concrete Columns Using Composite of Near Surface Mounted CFRP Strips and Fabric," M.S. thesis, American University of Sharjah, Sharjah, United Arab Emirates, 2016.

Ü. Karagöz Işleyen and H. İ. Kesik, "Experimental and numerical analysis of compression and bending strength of old wood reinforced with CFRP strips," Structures, vol. 33, pp. 259–271, Oct. 2021, https://doi.org/10.1016/j.istruc.2021.04.070. DOI: https://doi.org/10.1016/j.istruc.2021.04.070

ASCE 7 standard. ASCE, 2016.

H. Al-Baghdadi, "Nonlinear Dynamic Response of Reinforced Concrete Buildings to Skew Seismic Excitation," Ph.D. dissertation, University of Baghdad, Baghdad, Iraq, 2014.

H. Harris and G. M. Sabnis, Structural Modeling and Experimental Techniques, 2nd ed. Boca Raton, FL, USA: CRC Press, 1999. DOI: https://doi.org/10.1201/9780367802295

Downloads

How to Cite

[1]
Z. H. Abdulghafoor and H. A. Al-Baghdadi, “Static and Dynamic Behavior of Circularized Reinforced Concrete Columns Strengthened with Hybrid CFRP”, Eng. Technol. Appl. Sci. Res., vol. 12, no. 5, pp. 9336–9341, Oct. 2022.

Metrics

Abstract Views: 358
PDF Downloads: 168

Metrics Information
Bookmark and Share

Most read articles by the same author(s)