Issue 31

C.L. dos Santos et alii, Frattura ed Integrità Strutturale, 31 (2015) 23-37; DOI: 10.3221/IGF-ESIS.31.03 34 of lateral member (see Fig. 13a). Also, it is verified that most of nodes have suffered a total resistance degradation; only the pair of nodes farthest away from the interface between the two wood members, did not reached their total decohesion before unstable crack propagation. Figure 12 : Crack opening displacement – elastic plus cohesive model results. (a) (b) Figure 13 : Radial stress evolution at the nodes situated in the interface on the hole surface (elastic plus cohesive damage modelling): (a) nodes location; (b) stress-displacement relation. (a) (b) Figure 14 : Load-displacement curves: experimental vs. numerical results: (a) side member with elastic behaviour and cohesive damage modelling and centre member with plastic behaviour; (b) members with elastic-plastic behaviour and cohesive damage modelling at side member. Fig. 14a compares the load-displacement curves from previous simulations and the one resulted from an elastic-plastic behaviour for the centre member and an elastic simulation with cohesive interface for the side member (“elastic-plastic with cohesive (1)” series). In addition, Fig. 14b presents the results obtained simulating all wood members with elasto- plastic behaviour and using a cohesive interface in the side member (“elastic-plastic with cohesive (2)” series). The analysis