Strengthening of timber beams with pretensioned CFRP strips

Halicka, Anna; Ślósarz, Szymon

doi:10.1016/j.istruc.2021.09.055

Cited by 22 publications

(10 citation statements)

References 29 publications

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“…As such, efforts are taken by many researchers and engineers to improve this behaviour by attempting to enhance the ductility of the beam system, for example by way of prestressing and fibre reinforce strengthening. To name a few of these works are Brady & Harte (2008), Negrao (2012), Balserio &Faria (2014), andHalicka &Ślósarz (2021).…”

Section: Fig 1 -First Curved Glulam Bridge In Frim Fig 2 -Mtib Glulam...mentioning

confidence: 99%

Bending Performance of Timber Beam Strengthened with Passive Prestressing

Yeoh,

Leng,

Jamaluddin

et al. 2023

IJSCET

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Prestressing technology and its application is common in concrete design and construction particularly in Malaysia and most parts of the world. However, prestress strengthening in timber is rare and not widely applied especially in Malaysia. Application of prestressing in timber has the potential to allow the use of longer span with reduced cross-sectional size and simultaneously exhibiting some level of ductility through the prestressing rod since timber material is susceptible to brittle tensile failure. This paper highlights exploratory research into the extent of bending performance enhancement in Malaysian Kempas species timber beam strengthened by way of passive prestressing. The research was conducted to investigate the change in bending strength and moment capacity of timber beam with passive prestressing rods installed at different lever arm positions, and the enhancement of moment capacity of timber beam with and without passive prestressing. Five Kempas timber specimen configurations with size of 40 mm (b) × 90 mm (d) × 900 mm (l) were prepared for four-point bending tests, and their bending behaviours were evaluated. The timber beam with passive prestressing steel rods applied at tension side bottom fibre of timber beam exhibited the greatest enhancement in bending performance and stiffness. The improvement of bending performance ranges from 1.1 to 1.5 times greater compared to the timber beam without prestressing steel rods. The improvement of stiffness in prestressed timber beam is up to 11% at service limit state and a reduced rate of stiffness degradation is prominent.

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Section: Fig 1 -First Curved Glulam Bridge In Frim Fig 2 -Mtib Glulam...mentioning

confidence: 99%

Bending Performance of Timber Beam Strengthened with Passive Prestressing

Yeoh,

Leng,

Jamaluddin

et al. 2023

IJSCET

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“…The reinforcement can be placed inside or outside the cross-section in the tensile and/or compressive zone. Currently, elements made out of composite materials reinforced with carbon [ 6 , 7 , 8 , 9 ], glass [ 10 , 11 ], basalt [ 12 ] and aramid [ 13 ] fibers, as well as steel elements [ 14 ], are most often used as reinforcement.…”

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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“…It is always the timber engineers' dream to develop an effective, practical, pure bio-based prestressed technology with in-situ flexibility that allows members to be cut and adjusted in-situ. The most common approach currently followed by timber engineers and researchers is still more and less the same conventional technique for reinforced concrete, i.e., prestressed by high-stiffness/strength prestress tendons with spreading end plates as the anchors [12][13][14]. The difference in stiffness and strength between the prestress tendons and wood or bio-based materials has put these conventional approach followers in a dilemma, whereby adopting a low prestress level will limit the effectiveness of the prestress technology while switching to a high prestress level will result in high time-dependant relaxation.…”

Section: Introductionmentioning

confidence: 99%

A new concept of bio-based prestress technology with experimental Proof-of-Concept on Bamboo-Timber composite beams

Zhang,

Shen,

Deng

et al. 2023

Construction and Building Materials

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Strengthening of timber beams with pretensioned CFRP strips

Cited by 22 publications

References 29 publications

Bending Performance of Timber Beam Strengthened with Passive Prestressing

Bending Performance of Timber Beam Strengthened with Passive Prestressing

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

A new concept of bio-based prestress technology with experimental Proof-of-Concept on Bamboo-Timber composite beams

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