Structural behavior of standard timber beams strengthened using CFRP sheet

Al-Katib, Haider A. A.; Alkhudery, Hayder H.; Al-Tameemi, Haider Ali

doi:10.1007/s42107-022-00452-w

Cited by 5 publications

(3 citation statements)

References 21 publications

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“…13. By Introducing an initial small value of strain in the outermost fiber in compressive zone εci, the neutral axis location is achieved in corresponding load stage using strain compatibility and force equilibrium equations (1)(2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12). b) Plastic stage.…”

Section: Theoretical Modelmentioning

confidence: 99%

“…However, unlike other engineering materials, timbers are of organic origin and anisotropic; their strength and mechanical characteristics vary considerably. Thus, extensive experimental research is required to achieve the demand for timber building [1][2][3]. Concrete and steel are artificial materials developed for specific activities; thus, they are lesser likely to contain defects similar to those caused by a natural result in timber.…”

Section: Introductionmentioning

confidence: 99%

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Experimental and theoretical investigation of the structural behavior of reinforced glulam wooden members by NSM steel bars and shear reinforcement CFRP sheet

Alkhudery

Al-Katib

Al-Tameemi

2023

Preprint

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The current investigation is an attempt to evaluate the effectiveness of utilizing steel bars as reinforcements in glulam timber beams using the near-surface-mounted (NSM) technique. A series of flexural testing was carried out until failure for both reinforced and unreinforced glulam members in a simple support system. Eleven specimens were examined in two groups to compare with the controlled beam. Five reinforced glulam beams of the first group were reinforced with different schemes at tension and compression zones using the same bar size, while other five specimens of the second group were reinforced in addition to the same flexural reinforcement schemes, the shear reinforcement using fully wrapping strips made of CFRP sheet. Each glulam beam has a span of 1.35 m and a rectangular section sized 85×175 mm. Experimental results presented, that the reinforced glulam beams performed much better than unreinforced reference beams in terms of structural behavior with improvements in ultimate load capacity ranging from 16 to 49%. Based on experimental outcomes, theoretic modeling was provided to estimate the ultimate load capacity and bending rigidity of reinforcing glulam members. Though several theoretical predictions of flexural capacity were overstated when compared to experimental predictions, these disparities were frequently about 10%, confirming that the proposed theoretical model was accurate and the mean of ultimate loading capacity and deflection between experimental and theoretical results were 1.01 and 1.09, respectively, while the shear reinforcement for reinforced glulam members slightly improved flexural performance and ultimate load capacity increased by 2–7%.

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Section: Theoretical Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental and theoretical investigation of the structural behavior of reinforced glulam wooden members by NSM steel bars and shear reinforcement CFRP sheet

Alkhudery

Al-Katib

Al-Tameemi

2023

Preprint

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show abstract

“…Compared to other building materials, wood is a material of organic origin and is anisotropic; therefore, its strength and mechanical properties vary significantly. In order to achieve and meet the demand for timber construction, experimental studies are required to be carried out [1][2][3][4].…”

Section: Introductionmentioning

confidence: 99%

Load and Deformation Analysis in Experimental and Numerical Studies of Full-Size Wooden Beams Reinforced with Prestressed FRP and Steel Bars

Wdowiak-Postulak,

Gocál,

Bahleda

et al. 2023

Applied Sciences

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The use of composite precast or steel bars as reinforcements for timber beams is an important technique that can improve effectiveness or allow cross sections to be reduced. This paper presents experimental, theoretical, and numerical studies of full-size timber beams measuring 82 × 162 × 3650 mm3 using prestressed steel bars and 10 mm diameter basalt and glass bars with a prestress of 10 MPa. In addition, parametric studies were carried out using FEM numerical simulations. In the experimental tests, an increase in load-bearing capacity and stiffness of up to 58% and 10.7% for steel bars, 32% and 10.1% for basalt bars, and 27% and 7.8% for glass bars, respectively, was obtained compared to unreinforced beams. The different levels of improvement in reinforcement efficiency was also related to the different elastic modulus of the reinforcement itself. Unreinforced beams showed a linear elastic range. In contrast, on beams reinforced with steel bars, the curve had a slightly steeper line than the control beam, and the slope of the curve then decreased when a certain load was reached. All beams failed when the lower wood fibers reached maximum tensile strain. The allowable compressive strain then decreased by 36.6% for basalt bars, 32.9% for glass bars, and 30.4% for steel bars. The use of prestressing further exploited the strength of the reinforcement beyond the yield point. All unreinforced beams primarily failed in the tension zone due to fracture of the timber fibers. Prestressed and reinforced beams were already failing due to bending and shear. The experimental and numerical analysis was also compared, and the results showed a good agreement and a maximum difference of approximately 5.7%.

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Improving the flexural rigidity of laminated bamboo beams using fiber reinforcement polymer

Karyadi,

Aqnes Sindi Safira,

Sulaksitaningrum

et al. 2024

Cogent Engineering

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Structural behavior of standard timber beams strengthened using CFRP sheet

Cited by 5 publications

References 21 publications

Experimental and theoretical investigation of the structural behavior of reinforced glulam wooden members by NSM steel bars and shear reinforcement CFRP sheet

Experimental and theoretical investigation of the structural behavior of reinforced glulam wooden members by NSM steel bars and shear reinforcement CFRP sheet

Load and Deformation Analysis in Experimental and Numerical Studies of Full-Size Wooden Beams Reinforced with Prestressed FRP and Steel Bars

Improving the flexural rigidity of laminated bamboo beams using fiber reinforcement polymer

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