Estimation of the Modulus Fir Wood Reinforced With PBO Fiber Mesh

Sokołowski, Piotr; Kossakowski, P.

doi:10.2478/ace-2018-0047

Cited by 5 publications

(4 citation statements)

References 5 publications

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“…A commonly used technique to reinforce or repair bent wooden (solid or glued) beams is the introduction of additional elements withing existing structures [ 1 , 2 ]. The additional elements may include bars [ 3 , 4 , 5 , 6 , 7 , 8 ], laminates [ 9 , 10 , 11 , 12 , 13 ], meshes [ 14 ] or sheets [ 15 ]. These elements may be made of steel [ 16 ] or composites reinforced with carbon [ 17 , 18 , 19 ], glass, basalt and aramid fibers.…”

Section: Introductionmentioning

confidence: 99%

Strengthening of Full-Scale Laminated Veneer Lumber Beams with CFRP Sheets

Bakalarz

Kossakowski

2022

Materials

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This paper presents the results of experimental research on full-size laminated veneer lumber (LVL) beams unreinforced and reinforced with CFRP sheets. The nominal dimensions of the tested beams were 45 mm × 200 mm × 3400 mm. The beams were reinforced using the so-called U-type reinforcement in three configurations, differing from each other in the thickness of the reinforcement and the side surface coverage. An epoxy resin adhesive was used to bond all the components together. A four-point static bending test was performed according to the guidelines in the relevant European standards. The effectiveness of the reinforcement increased with the level of coverage of the side surface and the level of reinforcement. The average increases of bending resistance were 42%, 51% and 58% for configurations B, C and D, respectively. The average value of bending stiffness increased for the beams of series B, C and D by 15%, 31% and 43%, respectively. Their failure mode changed from brittle fracture initiated in the tensile zone for unreinforced beams to more ductile fracture, initiated in the compression zone. The influence of the coverage of the side surface by the CFRP sheet and reinforcement ratio on the mechanism of failure and effectiveness of strengthening was studied in the article.

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Section: Introductionmentioning

confidence: 99%

Strengthening of Full-Scale Laminated Veneer Lumber Beams with CFRP Sheets

Bakalarz

Kossakowski

2022

Materials

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“…Beams with cross-sectional dimensions 8×8 cm and length of 160 cm were reinforced with PBO mesh bond to the bottom tensile side. The results indicated increase of bearing capacity of beams reinforced in this way by 56%, the modulus of elasticity by 4.9% and the deflection of beam at the time of destruction by 77.5% [23].…”

Section: Timber Beamsmentioning

confidence: 86%

Archives of Civil Engineering

Jurczakiewicz,

Karczmarczyk

2022

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Traditional methods of restoring historical buildings typically consisted in replacing the damaged elements or additional steel and reinforced concrete elements were inserted into the old structure. They significantly interfered with the statics and aesthetics of buildings. Current composite materials used in restoration damage the old structure only slightly and can usually be removed in the future. Due to these advantages they comply with the conservation law in force. This paper presents a few examples of practical applications of composites the authors have designed for structural reinforcement and protection of historical buildings. Repairs of columns, vaults, masonry walls, stone facades and wooden beams with the use of steel screw-shaped bars and high strength fibres in epoxy resin or cement matrix were presented. Problems of ensuring the proper bond of the composite to the old substrate and insufficient coverage of the fibers with the cement matrix were considered. Although the threats and structural damages which occur in most historical buildings tend to be similar, individual design solutions are required in each case. Historical investigation and detailed measurement of geometry and deflections have to be made before choosing the appropriate method of reinforcing the old structure. It can be predicted that prestressing composite materials used for historical structures will also be applied.

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“…They concluded improvement of the stiffness and bending capacity in comparison with the control specimens. Sokołowski and Kossakowski [ 19 ] studied the behavior of solid timber beams strengthened with PBO (p-Phenylene Benzobis Oxazole) mesh. They achieved significant improvement of the destructive force and deflection of the strengthened beams equal to 56% and 77.5% in comparison to the unstrengthened beams.…”

Section: Introductionmentioning

confidence: 99%

Application of Digital Image Correlation to Evaluate Strain, Stiffness and Ductility of Full-Scale LVL Beams Strengthened by CFRP

Bakalarz

Tworzewski

2023

Materials

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Due to limitations of traditional measuring methods, a necessity of verification of applicability of optical measuring systems in different fields of science is required. The paper presents the application of a non-contact, non-destructive ARAMIS optical system in the analysis of static work of unstrengthened and strengthened laminated veneer lumber beams (LVL) with composite materials, subjected to a four-point bending test. The beams were strengthened with Carbon Fiber Reinforced Polymer (CFRP) sheets and laminates. The sheets were bonded to the external surfaces in three configurations differing in the number of layers applied and the degree of coverage of the side surface. The CFRP laminates were glued into predrilled grooves and applied to the underside of the beams. An adhesive based on epoxy resin was used. The scope of the work includes analysis of the strain distribution, stiffness and ductility. The analysis was performed on the basis of measurements made with an optical measurement system. The strain analysis indicated a change of the distribution of the strain in the compressive zone from linear for the unstrengthened to bilinear for the strengthened beams. The stiffness increase was equal from 14% up to 45% for the application of the CFRP laminates in the grooves and CFRP sheets bonded externally, respectively. Similar improvement was obtained for the ductility.

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Estimation of the Modulus Fir Wood Reinforced With PBO Fiber Mesh

Cited by 5 publications

References 5 publications

Strengthening of Full-Scale Laminated Veneer Lumber Beams with CFRP Sheets

Strengthening of Full-Scale Laminated Veneer Lumber Beams with CFRP Sheets

Archives of Civil Engineering

Application of Digital Image Correlation to Evaluate Strain, Stiffness and Ductility of Full-Scale LVL Beams Strengthened by CFRP

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