The strength prediction of laminated finger jointed Eucalyptus grandis members using computer simulation

Abstract

After discussing the shortcomings of available strength data on South African Eucalyptus grandis the author suggests possible research areas so that greater clarity about the strength properties of the abovementioned material can be obtained. Greater clarity about strength properties of the Eucalyptus grandis would lead to a better understanding of the failure mechanisms of laminated Eucalyptus grandis members. The strength properties of the material and the possible correlation between these properties are required for the simulation of the laminated member's strength. Various laboratory tests were used to determine the strength properties of the E. grandis and these are discussed, the data are presented and conclusions about the strength properties such as modulus of elasticity, tensile strength parallel to the grain, tensile strength perpendicular to the grain and shear strength are made. The significance of the strength properties with regard ·to the failure of laminated finger jointed members is discussed. The correlation between the various strength properties, which is used in the simulation of laminated members, is determined. Possible further tests as well as testing methods are suggested. The simulation method is discussed and a method of simulating random finger joint strength, board strength and board stiffness is presented. This method is expanded to simulate correlated finger joint strength, board strength and board stiffness.