PSI - Issue 5

P.C. Raposo et al. / Procedia Structural Integrity 5 (2017) 1086–1091 Patrícia Raposo et al. / Structural Integrity Procedia 00 (2017) 000 – 000

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(b)

Fig. 1. a) Plant of the farm denominated "Quinta de Lobeira de Cima ” ; b) “Sequeiro” Building used to remove the specimens (adapted from: [2]).

2. Experimental Campaign

In this study was obtained, experimentally, the tensile strength parallel to the fibers of some specimens extracted from the roof wood structure of the “sequeiro” building [4, 5]. The extension were measured using digital image correlation (DIC) technique in a macro scale (0.1-1 m). The experimental tests were performed on a universal INSTRON 1125 mechanical test machine, using a load cell with the capacity of 100 kN.

2.1. Tensile strength parallel to the fibers

The tensile strength parallel to the fibers was evaluated by performing tensile tests on 16 rectangular prisms, of each wood species, with dimensions 5×20×200 mm 3 , as showed in Fig. 2. In the extremities of the wood specimens, which were in the grip zone, were glued, with white glue, "wafers" of Cambala wood, with 55 mm in length and 2 mm of thickness. The tensile tests were performed at a crosshead speed of 2 mm/min until to the failure. In Fig. 3 (a) is shown the experimental setup of the tensile tests.

Fig. 2. Dimensions of the rectangular prisms for the tensile test parallel to the fibres (all dimensions in mm) (adapted from: [2]).