Braided GFRP sleeving reinforced curved laminated bamboo beams: An efficient way to attenuate delamination

Abstract

For curved laminated bamboo beams, delamination greatly attenuates their load carrying capacity and ductility. In this study, glass fiber reinforced polymer sleeving (GFRPS) was applied to strengthen the laminated bamboo arch (LBA), forming a new composite bamboo structure. Three-point bending experiments were carried out to investigate the deformation and failure behaviors. It is found that the GFRPS effectively restrains the delamination and forms a plastic hinge at the vault after the peak load, which greatly enhances the load carrying capacity and results in a long deformation Plateau I (Plateau I is a plateau segment where the load P is greater than the average peak load (50.82 kN) of group BAH). Plateau I is elongated over 29.6 times by the GFRPS, indicating that GFRPS reinforced LBA becomes ductile. The peak load can be improved by 32.8% while the load of the second Plateau II (Plateau II is a common ductility plateau in ductile materials) is enhanced by 62.1%. The curved composite beam exhibits superior ductility and energy dissipation. Reaching 110 mm for the displacement, the average energy dissipation of the composite LBA could be 87.13% higher than that of the LBA.