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Tests were conducted on laminated wood beams to investigate—(a) the effect of single hooked and end-stepped scarf joints and plain scarf joints placed in the outer tension lamination, (b) the effect of planing surface end steps of hooked scarf joints and surface feather edges of plain scarf joints, and (c) the effect of various spacings of plain scarf joints. Results indicate that the reduction in strength produced by hooked and end-stepped scarf joints is of greater magnitude than calculated in accordance with present Canadian Standards Assn. (CSA) Specifications. Planing the surface end step of a scarf joint produced a strength comparable to that of a beam containing no scarf joints. Planing surface feather edges of plain scarfs also resulted in an increase in strength. There was no significant difference in the strength of beams containing three different spacing patterns, indicating that the strength of a beam is governed essentially by the strength of the joint in the extreme tension lamination when that joint is at a section of maximum bending moment.
Associate Professor, University of Alberta, Edmonton, Alta.
Structural Design Engineer, Wilson Concrete Products, Ltd., Belleville, Ont.