Old Timber Reinforcement with FRPs

The demand for timber resources in the building industry has been increasing. Plantation Eucalyptus nitens is of interest because of its sustainable supply and potential for structural applications. However, few design standards cover strength values of plantation eucalypt timber, especially flexural failure below and above the fibre saturation point, which is an important mechanism of failure in bending members used in the building industry. Static bending tests were undertaken using a universal testing machine to examine nonlinear bending behaviour of 130 fibre managed E. nitens small clear wood samples at low and high moisture contents (MC). The mean bending modulus of rupture (MOR) was 80.7 MPa for low MC and 59.0 MPa for high MC. The high MC samples exhibited larger displacements at low ultimate loads, while the low MC samples showed abrupt failures at relatively small displacements with high ultimate loads. The design characteristic values for low and high MC E. nitens were 68.5 MPa and 39.8 MPa, respectively. This research demonstrates that fibre managed E. nitens timber is a promising timber for structural applications, especially when exposed to water, as the MOR reduction of E. nitens timber above FSP is relatively lower than those of P. radiata, which is a traditional construction material.

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“…The MOR was calculated from the maximum load (N), Pmax, as given in Eq. 2 (Brol and Wdowiak-Postulak 2019;Derikvand et al 2019c):…”

Section: Data Analysis Moe and Mormentioning

confidence: 99%

Flexural characteristics of Eucalyptus nitens timber with high moisture content

Cheng

Nolan

Holloway

et al. 2021

BioRes

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“…Still, they were applied for two types of joints. The first one was strengthening of structures using composite materials that are glued to the original structure [ 7 , 8 , 9 ]. The other group was multimaterial structures where mechanical point fastening was advised against, including glass structures (hybrid beams, prefabricated composites structures, façade elements) [ 10 , 11 , 12 ].…”

Section: Introductionmentioning

confidence: 99%

FEM Analysis as a Tool to Study the Behavior of Methacrylate Adhesive in a Full-Scale Steel-Steel Shear Joint

Kałuża

Hulimka

Bula³

2022

Materials

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The use of adhesive to joint structural elements, despite many advantages of this technology, is not a method commonly used in engineering practice, especially in construction. This is mainly due to the poor recognition of the behavior, both in terms of testing and analysis, of joints made on a scale similar to the actual elements of building structures. Therefore, this paper presents the results of model tests and then numerical analyses of adhesively bonded joints made of high-strength steel elements in a full-scale (double-lap joint). In order to properly model the adhesive connection, material tests of the methacrylate adhesive were performed in the field of tensile, shear (in two versions: single lap joint test and thick adherent shear test) and bond properties. Comparison of the results of the model and numerical tests showed very good agreement in terms of the measurable values, which makes it possible to consider the results obtained in the adhesive layer as reliable (not directly measurable in model tests). In particular, the distribution of stresses inside the adhesive layer, the range of plastic zones and areas of loss of adhesion are presented and discussed. The results indicate the possibility of a reliable representation of the behavior of adhesively bonded joints of high-strength steel, thus providing a tool for the analysis of semirigid adhesive in large-size joints.

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“…Haojuni researchers et al [29] found that FRP reinforcements improve the mechanical properties of reinforced wooden elements. Many other research works on FRP reinforced beams were also carried out, taking into account also the structural and geometric features of construction timber [29][30][31][32][33][34][35][36][37][38][39][40][41][42][43][44][45]. In the studies [46][47][48], the obtained increase in the load-bearing capacity of reinforced beams depended mainly on the type of the reinforced element or fiber, the reinforcement layout, the degree of FRP reinforcement and the cohesion of the bonding surface between FRP and wood.…”

Section: Introductionmentioning

confidence: 99%

Behavior of Glulam Beams Strengthened in bending with BFRP Fabrics

Wdowiak-Postulak

Świt

2021

Civil and Environmental Engineering Reports

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The article presents results of an experimental studies on reinforcement of pine beams made from glued laminated timber with subsurface basalt fibers (BFRP). An experimental research program was presented, in which the bending strength of glued laminated timber of middle and lower quality class was increased after using BFRP basalt fabrics. Thanks to the use of BFRP reinforcement, an average load capacity increased by 47% and stiffness by 6% in comparison to non-reinforced elements. Based on the research, it was found that the use of BFRP basalt fabrics is an effective method for strengthening damaged wooden elements. Thus, it is an environmentally friendly method of improving the static work of structural elements by combining wood with other natural materials such as basalt fiber reinforced polymers.

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Old Timber Reinforcement with FRPs

Cited by 20 publications

References 7 publications

Flexural characteristics of Eucalyptus nitens timber with high moisture content

Flexural characteristics of Eucalyptus nitens timber with high moisture content

FEM Analysis as a Tool to Study the Behavior of Methacrylate Adhesive in a Full-Scale Steel-Steel Shear Joint

Behavior of Glulam Beams Strengthened in bending with BFRP Fabrics

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