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Structural Engineering and Mechanics
  Volume 73, Number 3, February10 2020 , pages 353-365

Timber-FRP composite beam subjected to negative bending
Mahbube Subhani, Anastasia Globa and Jules Moloney

    In the previous studies, the authors proposed the use of laminated veneer lumber – carbon fiber reinforced polymer (LVL-CFRP) composite beams for structural application. Bond strength of the LVL-to-CFRP interface and flexural strengthening schemes to increase the bending capacity subjected to positive and negative moment were discussed in the previous works. In this article, theoretical models are proposed to predict the moment capacity when the LVL-CFRP beams are subjected to negative moment. Two common failure modes – CFRP fracture and debonding of CFRP are considered. The non-linear model proposed for positive moment is modified for negative moment to determine the section moment capacity. For the debonding based failure, previously developed bond strength model for CFRP-to-LVL interface is implemented. The theoretical models are validated against the experimental results and then use to determine the moment-rotation behaviour and rotational rigidity to compare the efficacy of various strengthening techniques. It is found that combined use of bi- and uni-directional CFRP U-wrap at the joint performs well in terms of both moment capacity and rotational rigidity.
Key Words
    CFRP, LVL; negative moment; composites; analytical modelling; moment-rotation
Mahbube Subhani: School of Engineering, Deakin University, Waurn Ponds, VIC 3216, Australia
Anastasia Globa: School of Architecture, Design and Planning, University of Sydney, NSW 2008, Australia
Jules Moloney: School of Design, RMIT University, Melbourne 3001, Australia

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