Experimental Characterization of Semi-Rigidity of Standardized Lattice Beam Using the Grid Method

Abstract

Timber structures often exhibit shear and tension perpendicular to grain. This phenomenon induces brittle failure if it is not controlled. This is particularly the case in joining zones, and even more when the beam elements are thin. These thin elements can be found for example in lattice beams. Standardized lattice timber beams appear as an efficient solution for economical, ecological and mechanical aspects. This study focuses on the mechanical behavior of notched beams. Experiments are carried out with a classic loading device and LVDT measurements as well as with the grid method which provides full-field displacement and strain measurements. Tests are conducted for various orientations of annual rings of the wood. The evolutions of strains in the zone affected by shear and tension stresses are analyzed.