Evaluation and flexural response of timber beams strengthened with FRP bars

Alfred Gand, David Yeboah

Research output: Contribution to journalArticle

Abstract

Performance of strengthened timber beams using epoxy resin with
near-surface mounted (NSM) basalt, and glass fibre reinforced polymer
(FRP) and steel bars single reinforcement is the primary focus of the
experimental study. Typical common interventions with timber mainly
comprise of steel fabrication or bolt-on timber sections. It is in the
vital interest for designers to adopt interventions that satisfy
structural integrity and to maintain a conservation philosophy. Hence,
introducing the strengthening of timber beams with bars, in particular,
FRP is an emerging composite in recent years with timber interventions.
The experimental method consisted of fabrication of NSM FRP and steel
bars bonded with timber (75 × 145 × 2400) with epoxy resins. The testing
results indicated that the reinforced timber beams provided higher
ultimate load than the controlled specimen by approximately 33 - 88%.
Furthermore, the NSM specimens were significantly stiffer than the
corresponding unreinforced timber beam. Theoretical results also recorded
similar results. The most notable failure mechanism was tensile failure
of timber and epoxy glue failure. The strain distribution of the
reinforced timber beams showed that the specimens varied with the
distribution of the neutral axis that shifted to both compression and
tensile zones.
Original languageEnglish
Number of pages24
JournalStructures
Publication statusSubmitted - 6 Nov 2019

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Timber
Fibers
Polymers
Epoxy resins
Fabrication
Basalt
Steel
Glues
Strengthening (metal)
Bolts
Glass fibers
Conservation
Reinforcement
Composite materials

Cite this

Gand, A., & Yeboah, D. (2019). Evaluation and flexural response of timber beams strengthened with FRP bars. Manuscript submitted for publication.

Evaluation and flexural response of timber beams strengthened with FRP bars. / Gand, Alfred; Yeboah, David.

In: Structures, 06.11.2019.

Research output: Contribution to journalArticle

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abstract = "Performance of strengthened timber beams using epoxy resin withnear-surface mounted (NSM) basalt, and glass fibre reinforced polymer(FRP) and steel bars single reinforcement is the primary focus of theexperimental study. Typical common interventions with timber mainlycomprise of steel fabrication or bolt-on timber sections. It is in thevital interest for designers to adopt interventions that satisfystructural integrity and to maintain a conservation philosophy. Hence,introducing the strengthening of timber beams with bars, in particular,FRP is an emerging composite in recent years with timber interventions.The experimental method consisted of fabrication of NSM FRP and steelbars bonded with timber (75 × 145 × 2400) with epoxy resins. The testingresults indicated that the reinforced timber beams provided higherultimate load than the controlled specimen by approximately 33 - 88{\%}.Furthermore, the NSM specimens were significantly stiffer than thecorresponding unreinforced timber beam. Theoretical results also recordedsimilar results. The most notable failure mechanism was tensile failureof timber and epoxy glue failure. The strain distribution of thereinforced timber beams showed that the specimens varied with thedistribution of the neutral axis that shifted to both compression andtensile zones.",
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