Load bearing capacity of laminated veneer lumber beams strengthened with CFRP strips
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Kielce University of Technology, Faculty of Civil Engineering and Architecture, Al. Tysiąclecia Państwa Polskiego 7, 25-314 Kielce, Poland
Submission date: 2020-11-17
Final revision date: 2021-02-03
Acceptance date: 2021-02-03
Publication date: 2021-09-08
Archives of Civil Engineering 2021;67(3):139-155
The paper presents the results of experimental tests on the reinforcement of bent laminated veneer lumber beams with carbon fibre reinforced polymer (CFRP) strips glued to the bottom of elements. CFRP strips (1.4×43×2800 mm) were glued to the beams by means of epoxy resin. The tests were performed on full-size components with nominal dimensions of 45×200×3400 mm. Static bending tests were performed in a static scheme of the so-called four-point bending. The increase in the load bearing capacity of the reinforced elements (maximum bending moment and loading force) was 38% when compared to reference beams. A similar increase was noted in relation to the deflection of the elements at maximum loading force. For the global stiffness coefficient in bending, the increase for reinforced beams was 21%. There was a change in the way elements were destroyed from brittle, sudden destruction for reference beams resulting from the exhaustion of tensile strength to more ductile destruction initiated in the compressive zone for reinforced beams. The presented method can be applied to existing structures.
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