article · World Journal of Materials Science and Technology
Timber is a sustainable construction material but possesses lower tensile strength than steel or concrete. Experimental mechanical testing assessed the reinforcement of timber beams using clamping plates combined with steel bars of 8 mm, 10 mm, and 12 mm diameters against an unreinforced control. The reinforcement improved flexural, tensile, and compressive performance. The 12 mm reinforced beam raised flexural strength by 15.6 percent over the control, whilst tensile failure load grew by 283 percent compared to the 8 mm bar. Compressive strength also improved notably. However, gains plateaued between 10 mm and 12 mm bars, showing only a 0.86 percent difference in flexural strength alongside a stiffer, faster failure in tension. Clamped plates provided effective load transfer, leading to the conclusion that 10 mm steel bars provide the most practical and cost-effective balance of strength gains.
Timber is a renewable building material, but structural limits often prevent its wider adoption in load-bearing roles. Adding steel bar reinforcement with clamping plates provides a measurable way to overcome tensile weaknesses. Demonstrating that a 10 mm bar provides near-peak performance allows structural designers to maximise load resistance without wasting materials or incurring unnecessary costs.
This represents applied, laboratory-tested research relevant to structural engineers, timber fabricators, and construction contractors designing reinforced timber beams. The findings offer practical guidance on choosing optimal 10 mm reinforcement rather than heavier bars to control material costs. However, moving this towards commercial use would require validation in full-scale structures, standardised connection methods, and compliance with building codes.
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Timber, while a sustainable and widely available construction material, is inherently weaker in tension compared to steel or concrete. This study experimentally investigates the strengthening of timber beams using steel bar reinforcement and clamping plates under mechanical loading. The performance was evaluated by testing beams with 8 mm, 10 mm, and 12 mm diameter steel bars against an unreinforced control. The results demonstrate significant improvements in all key mechanical properties. In flexural strength, the 12 mm reinforced beam achieved a peak of 2.4409 N/mm 2 , a 15.6% increase over the unreinforced baseline of 2.112 N/mm 2 . Tensile strength showed the most dramatic gain, with the failure load surging from 14.045 kN for the 8 mm bar to 53.818 kN for the 12 mm bar with a 283% increase. Compressive strength also improved, with the 12 mm reinforced specimen reaching 22.187 N/mm 2 compared to 16.393 N/mm 2 for the control. A key finding was the trend of diminishing returns; the flexural strength difference between the 10 mm and 12 mm bars was only ~0.86%, indicating a performance plateau. Furthermore, increased reinforcement led to a stiffer response, reducing the time to failure in tension from 36.67 seconds (8 mm) to 32.04 seconds (12 mm). The use of clamped steel plates was critical in facilitating efficient load transfer and preventing premature failure. It is concluded that while larger reinforcement diameters enhance performance, a 10 mm bar offers the most cost-effective and practical solution for optimal strength gains in reinforced timber beam design.
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DOI: 10.11648/j.wjmst.20260302.11
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