Journal article
Stability of Built-Up Timber Beams and Columns: Accounting for Modulus of Elasticity Variability
Practice periodical on structural design and construction, Vol.15(4), pp.272-277
11/2010
Handle:
https://hdl.handle.net/2376/111019
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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Details
- Title
- Stability of Built-Up Timber Beams and Columns: Accounting for Modulus of Elasticity Variability
- Creators
- Robert E Kimble - Great West Engineering , 462 Mountaineer Dr., Williamstown, WV 26187; formerly, Design Engineer, , Helena, MTDonald A Bender - Washington State Univ. , Composite Materials and Engineering Center, , P.O. Box 641806, Pullman, WA 99164-1806 (corresponding author). E-mail
- Publication Details
- Practice periodical on structural design and construction, Vol.15(4), pp.272-277
- Academic Unit
- Composite Materials and Engineering Center
- Publisher
- American Society of Civil Engineers
- Identifiers
- 99900547217301842
- Language
- English
- Resource Type
- Journal article