AbstractConsidering effect of crack gap and regarding crack as a nonlinear rotational spring, and assuming tight bonding between the fiber reinforced polymer (FRP) sheet and timber beam surface, bending performance of the cracked standard linear solid viscoelastic beam reinforced with FRP sheet was investigated. Equivalent flexural rigidity of FRP sheet-reinforced crack and the governing equation for bending deformation of viscoelastic rectangular cross-section beam reinforced with FRP sheet are presented. An analytical solution of bending creep of a simply-supported FRP sheet-reinforced cracked viscoelastic beam subject to a step uniform load was obtained with the boundary conditions and crack’s continuity conditions of beam bending by using the Laplace transform and its inverse transform. The influences of volume fraction of carbon fiber reinforced polymer (CFRP) sheet, span-depth ratio of the beam, location and open-closed state of the crack on the bending creep of the CFRP sheet-reinforced cracked viscoelastic Douglas-fir (DF) timber beam were analyzed numerically.
Received: 13 December 2016
Published: 26 December 2018