Potential side-NSM strengthening approach to enhance the flexural performance of RC beams: Experimental, numerical and analytical investigations

Md. Akter Hosen, Mohd Zamin Jumaat, A.B.M. Saiful Islam, Khalid Ahmed Al Kaaf, Mahaad Issa Shammas, Ibrahim Y. Hakeem and Mohammad Momeen Ul Islam

Abstract

The performance of reinforced concrete (RC) beam specimens strengthened using a newly proposed Side Near Surface Mounted (S-NSM) technology was investigated experimentally in this work. In addition, analytical and nonlinear finite element (FE) modeling was exploited to forecast the performance of RC members reinforced with S-NSM utilizing steel bars. Five (one control and four strengthened) RC beams were evaluated for flexural performance under static loading conditions employing four-point bending loads. Experimental variables comprise different S-NSM reinforcement ratios. The constitutive models were applied for simulating the non-linear material characteristics of used concrete, major, and strengthening reinforcements. The failure load and mode, yield and ultimate strengths, deflection, strain, cracking behavior as well as ductility of the beams were evaluated and discussed. To cope with the flexural behavior of the tested beams, a 3D non-linear FE model was simulated. In parametric investigations, the influence of S-NSM reinforcement, the efficacy of the S-NSM procedure, and the structural response ductility are examined. The experimental, numerical, and analytical outcomes show good agreement. The experimental findings were shown a significant increase in yield and ultimate strengths as well as improved failure modes.

Key Words

analytical model; ductility; flexural response; numerical model; S-NSM; steel bars; strengthening

Address

Md. Akter Hosen: Department of Civil and Environmental Engineering, College of Engineering, Dhofar University, PO Box 2509, PC 211, Salalah, Sultanate of Oman Mohd Zamin Jumaat: Department of Civil Engineering, Faculty of Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia A.B.M. Saiful Islam: Department of Civil & Construction Engineering, Imam Abdulrahman Bin Faisal University, 31451, Dammam, Saudi Arabia Khalid Ahmed Al Kaaf: Department of Civil and Environmental Engineering, College of Engineering, Dhofar University, PO Box 2509, PC 211, Salalah, Sultanate of Oman Mahaad Issa Shammas: Department of Civil and Environmental Engineering, College of Engineering, Dhofar University, PO Box 2509, PC 211, Salalah, Sultanate of Oman Ibrahim Y. Hakeem: Civil Engineering Department, Najran University, Najran P.O. Box 1988, Saudi Arabia Mohammad Momeen Ul Islam: Discipline of Civil and Infrastructure Engineering, School of Engineering, RMIT University, Melbourne, 3000, Victoria, Australia

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