Simplified Model for Strength Assessment of Timber Beams Joined by Bonded Plates

摘要

This paper presents a simplified method or analysis and design for repair using bonded rigid plates of timber beams with localized damage. This method assesses the load-bearing capacity of the connection between plate and timber and proposes two failure modes: shear stresses at the bonding interface and in the timber piece. An experimental campaign was developed to verify the theoretical model, which in this paper is limited to the problem of bending moment transfer. Ten specimens of Pinus radiata D. Don were joined with bonded-in plates and 10 with laterally bonded ones, after which they were tested for bending. Two epoxy formulations were used as adhesive and glass fiber-reinforced plastic (GFRP) plates for reinforcements. Tests with different anchorage lengths were developed to establish a relationship with load-carrying capacity. For an anchorage length approximately longer than twice the depth of the plate, failure was not located at the connection. There was reasonable agreement between the theoretical and experimental results. The former were always on the safe side, and there was better agreement in the case of laterally bonded plates.