Study of glulam beams pre-stressed with pultruded GRP

Guan, Zhong; Rodd, P.D.; Pope, David

doi:10.1016/j.compstruc.2005.03.021

Cited by 53 publications

(22 citation statements)

References 5 publications

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“…The results showed that the strength and stiffness of the beams could be increased considerably or even doubled as also shown by other researchers (Davids et al 2000;Hay et al 2006;Gómez and Svecova 2008). More recently, some researchers bonded pultruded glass fiber-reinforced plastic (GFRP) laminates to glulam beams (Guan et al 2005;Schober and Rautenstrauch 2007;Raftery and Harte 2011;De Jesus et al 2012). These results indicate that GFRP can be considered an effective and economically viable solution for strengthening and stiffening glulam beams, without adding any appreciable weight to the structure (Yusof and Saleh 2010;Osmannezhad et al 2014;Satasivam et al 2014).…”

Section: Introductionsupporting

confidence: 52%

Nondestructive Testing and System Reliability Based on Finite Element Modeling in GFRP-Reinforced Timber Beams

Zhu

Liu

2014

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In the past few decades, the use of glass fiber-reinforced polymers (GFRP) to enhance the strength and stiffness of timber beams has been established. Research to predict the performance of structural timber is ongoing. Nondestructive evaluation of its dynamic performance and reliability are important. A nondestructive testing method based on fast Fourier transform analysis was used to establish the dynamic modulus of elasticity of GFRP-reinforced timber beams. The results were compared to those obtained via destructive measurements of the static modulus of elasticity using a regression analysis method. Significant correlations between the dynamic modulus of elasticity (MOE) and static MOE indicate that nondestructive testing is a suitable tool for practical use. Reinforced timber beams were designed based on the measured dynamic MOE. Orthogonal theories were used to analyze the effects of the thickness, glue application, and surface area of GFRP on the MOE of reinforced timber beams. Furthermore, the system reliability of GFRPreinforced timber beams was predicted with a finite element model. The results showed that GFRP can significantly increase the reliability of structural lumber.

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Section: Introductionsupporting

confidence: 52%

Nondestructive Testing and System Reliability Based on Finite Element Modeling in GFRP-Reinforced Timber Beams

Zhu

Liu

2014

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“…Adding reinforcement is a widespread application for increasing the load-bearing capacities of glulam beams. Guan et al (2005) recently showed that due to the harmony of the two materials and low pre-tension losses of the pultruded glass-reinforced plastic (GRP) beams, it provided a suitable alternative.…”

Section: Introductionmentioning

confidence: 99%

Determination of the Modulus of Elasticity of Wooden Construction Elements Reinforced with Fiberglass Wire Mesh and Aluminum Wire Mesh

et al. 2017

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Laminated composite wooden construction elements were produced with 7 layers of Scots pine (Pinus sylvestris L.). Fiberglass wire mesh and aluminum wire mesh, which were used as reinforcement materials, were pressed with polyvinyl acetate (PVAc) and polyurethane-type adhesives between each Scots pine layer. The highest bonding strength values were obtained from laminated control specimens produced with polyurethane adhesive without using support materials (4.98 N/mm 2 ) and laminated control specimens made with polyurethane adhesive without using support materials (4.39 N/mm 2 ), respectively. The modulus of elasticity in bending perpendicular to the glue line values of all the specimens except the laminated control specimens produced with polyurethane adhesive without using support materials (14800 N/mm 2 ) were lower than solid wood (6720 N/mm 2 ). In contrast, in the experiments for the modulus of elasticity parallel to the glue line, the variables (adhesive, intermediary layer materials) used for all experiments and specimens were effective factors. Although the modulus of elasticity in bending parallel to the glue line values of all samples were higher than solid wood (6720 N/mm 2 ), the maximum value was obtained in the laminated control specimens produced with polyurethane adhesive without using support materials (17800 N/mm 2 ).

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“…Besides, pre-stress FRP sheets as external reinforcement of wood members can obtain more than 24% increasing of bending properties compare to not [5]. However, a number of studies have shown that delamination in the end position of composites is ubiquitous when FRP sheets pre-stressed [6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Effect of Cold Plasma Treatment on FRP Surface: The Behavior of FRP/Wood Interfacial Adhesion

Yuan¹,

Shen²,

Qiu³

et al. 2015

Proceedings of the AASRI International Conference on Industrial Electronics and Applications (2015)

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Abstract-In this work, FRP panel surface was treated by 12 plasma techniques formed by a pairwise combination of four power consumptions (300W, 400W, 500W, and 600W) and three transmission velocity (2.5m/min, 5.0m/min, and 7.5m/min) respectively, and then adhere to timbers. According to delamination test dates, 7 of 12 specimen groups meet the requirement. Shear strength at dry state of composite -FRP/wood -was improved. Mode G IIC of 4ENF for the composite fracture toughness test was inferred in this paper. Variance analysis results demonstrated that power and velocity interaction has significant influence on delamination properties of FRP-wood interface, and power has significant influence on shear strength and fracture toughness. Considering strength and toughness synthetically, the optimized process of plasma treatment on FRP surface could be concluded, which power consumption was 300W, transmission speed was 5.0m/min. With this process, the properties of the composite interface are as following: the average shear strength at dry state was 9.46MPa, 6.49MPa at wet state, the G IIC was 0.94kJ/m 2 , and the average delamination ratio was 1% and 3% after soaked in normal and boiling water, which are all meet the request of standard.

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Study of glulam beams pre-stressed with pultruded GRP

Cited by 53 publications

References 5 publications

Nondestructive Testing and System Reliability Based on Finite Element Modeling in GFRP-Reinforced Timber Beams

Nondestructive Testing and System Reliability Based on Finite Element Modeling in GFRP-Reinforced Timber Beams

Determination of the Modulus of Elasticity of Wooden Construction Elements Reinforced with Fiberglass Wire Mesh and Aluminum Wire Mesh

Effect of Cold Plasma Treatment on FRP Surface: The Behavior of FRP/Wood Interfacial Adhesion

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