Notes for calculated resistance to tension for laminated wood

Abstract

Wood as a material with sharply expressed anisotropic properties fully transfers them to glued wood. Depending on the force vector under tension along, across and at an angle to the fibers, it differ tenfold. The results of studies of laminated wood tensile at different angles to the orientation of the fibers are given. The results of calculations are determined with testing of standard samples fordesign strength according to the method of ALTI-CNIISK. It is established that the angle between fiber orientation and vector of the applied force is influenced a lot bythe tensile strength and depends on the sort of wood. The value of tensile strength is decreased when the angle vary from 0 to 90°. Experimental values are compared with theoretical results which are given in current standards-Rules and Norms 64.13330.2017 "Wooden structures". The difference between theoretical and standard results is 4 ... 70%. More accurate approximating expressions of experiments are presented, which can be used in practice instead of formula (6) from Rules and Norms.