Assessment of the anisotropic wood strength on local crushing

Abstract

Abstract Modern structural analysis standards for wooden and glued laminated building structures of civil and industrial buildings, bridges, electric power facilities, communications, etc., on the one hand, have differences, and on the other hand, general design principles (SP). However, the design resistances values are given only for the force vector acting along and across the fibers. The designer has to get the intermediate design resistances values according to the formulas of the 30s, very approximately, and sometimes incorrectly. For example, for cross laminated timber (CLT). Based on previously performed experimental researches and the results of calculations, general patterns of the resistance to local crushing changes were obtained for samples taken from glued laminated timber structures elements (glulam). General approaches have been developed to assess the strength of glulam (σ cr,a ) and its design resistances to local crushing (Rcr,a ) with varying static geometrical parameters of the hard stamp (ψ = d/l) depending on the external forces vector direction with respect to the wood fibers - lamellas (α). All this makes the research present-day and focused on improving reference documents.