ABSTRACT
Because the Equation 1 is experimentally founded, its reliability depends on the limits of the experimentation itself: namely on the species of the tested samples that are Silver fir (Abies Alba) and Larch (Larix decidua), on loading conditions (700 ÷ 3000 N) and moisture content in the range 12%–14%. However, due to the large amount of hardness test performed and since mechanical determination of the elastic modulus of some elements (tie-beams and rafters) is available, it was possible to calibrate the equation for the case o Spruce (Picea Abies Karst.). The value of δ= 0.6 was founded.After the calibration of the δ value, it was possible to calculate the elastic modulus of all elements that compose the two king post trusses.
