Abstract
Built-up beams and columns comprised of dimension lumber fastened with nails, bolts or lag screws, are common in construction. Current design practice for stability checks is to use the lower-tail modulus of elasticity ( Emin ) value tabulated for dimension lumber; however, this ignores the averaging effect on Emin that occurs when the mechanically fastened laminations are constrained to deflect in unison. In this paper, we propose a method for checking stability of these assemblies that is based on established statistical theory. A factor ( Cs ) is proposed to adjust Emin value used in column and beam stability calculations to account for the reduced variability of E when the laminations are constrained to deflect together. Using Cs to account for the reduction of Emin variability produces more efficient designs with respect to stability. Two examples are provided and each results in larger design capacities compared to current design methods for built-up beams and columns.
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