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Strength Prediction of Notched Foamed Concrete Beam Strengthened with KFRP Plates under Flexural Load

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Abstract

An experimental study to investigate the load at failure, failure mechanism, and crack propagation of a notched foamed concrete beam externally reinforced with a 200 mm length kenaf fiber reinforced polymer (KFRP) and tested under a four-point bending test (4PBT) is presented. In this study, the notch depth was varied. KFRP plates were fabricated by placing weaved yarns and smeared with Sika S31. From the experimental work, the shear failure and FRP rupture were seen. Various normalized notch depths significantly influenced allowable ultimate displacement, crack initiation, and failure modes. Following the preceding experimental series, a 2-D numerical modeling framework was developed to simulate the failure of the KFRP-strengthened foamed concrete beam. Independent tests had been carried out to determine material properties of the foamed concrete beam (i.e., un-notched beam strength, \({\sigma }_{o}\) and fracture energy, \({G}_{c}\)), later they were incorporated within a traction–separation relationship as a constitutive model of finite element modeling. The fracture energy values were calculated using Hillerborg’s model, which agrees well with the previous literature. Extended finite element model techniques were adopted for the strength prediction works. A good agreement was found between the predicted and experimental results with discrepancies of less than 15%.

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Acknowledgements

Communication of this research is made possible through monetary assistance by Universiti Tun Hussein Onn Malaysia and the UTHM Publisher’s Office via Publication Fund E15216. We also want to thank Research Management Center (RMC), University Tun Hussein Onn Malaysia (UTHM) for sponsoring this work under Postgraduate Research Grant (GPPS) (Research Grant No. H706).

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Authors and Affiliations

  1. Department of Civil Engineering, Faculty of Civil Engineering and Built Environment, Universiti Tun Hussein Onn Malaysia, Parit Raja, Batu Pahat, 86400, Johor, Malaysia

    M. R. Maulana, H. Ahmad & Z. M. Jaini

  2. Department of Mechanical Engineering, Faculty of Engineering, University of Mataram, Nusa Tenggara Barat, Majapahit, Mataram, 83115, Indonesia

    S. Sugiman

  3. School of Civil Engineering, Engineering Complex, Tunku Abdul Halim Muadzam Shah, Universiti Teknologi MARA, 40450, Shah Alam, Selangor Daru Ehsan, Malaysia

    Hazrina Mansor

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  1. M. R. Maulana
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Correspondence to H. Ahmad.

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Maulana, M.R., Sugiman, S., Ahmad, H. et al. Strength Prediction of Notched Foamed Concrete Beam Strengthened with KFRP Plates under Flexural Load. Arab J Sci Eng 48, 13059–13071 (2023). https://doi.org/10.1007/s13369-023-07688-x

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