The NDS Commentary references 2 papers that the current methodology in Chapter
15 is based on:
110. Malhotra, S.K. and A.P. Sukumar. A simplified procedure for built-up
wood compression members. St. John's, Newfoundland: Annual conference,
Canadian Society for Civil Engineering. (June): 1-18; 1989.
111. Malhotra, S.K. and D.B. Van Dyer. Rational approach to the design of
built-up timber columns. Madison, WI: Forest Products Research Society, Wood
Science. Vol. 9, No. 4: 174-186; 1977.
For more information on the NDS Commentary see:
Hope this information helps.
Buddy Showalter, P.E.
From: "Pat Clark" <bcinc(--nospam--at)nanosecond.com>
Subject: Re: 2x Built-up columns.
I am also working on a wood structure being constructed in Lost Wages (Las
Vegas) and am having similar problems with many large column loads bearing
on built-up 2x8 columns. We are currently trying to inform the
pre-fabricator of the elements (Illinois I believe) that the requirements of
the NDS need to be applied (what is the NDS they say), and that we need to
develop a more serious brace at the column-ceiling interface. The most
difficult thing we are having to design are the connector requirements that
specify penetrating through the entire assembly into a portion of the final
ply. Does anyone know more about how the Appendix in the NDS was developed?
From: Helen Zhou <Helen_Zhou(--nospam--at)stlouisco.com>
To: seaint(--nospam--at)seaint.org <seaint(--nospam--at)seaint.org>
Date: Friday, August 31, 2001 6:37 AM
Subject: 2x Built-up columns.
** Proprietary **
Moving from southern California to St. Louis, MO, I noticed more built-up
beams and columns in the residential construction here. 2-2x4 or 3-2x4 as
columns to support girder trusses with up to 8000 lbs. or 12000 lbs, If the
column ht goes to more than 12', I saw some 2x6 s. 10d or 16d nail @ 12" or
24" are common for these built-up columns. ½" plywood exterior and ½" gyp
board interior are the only bracing for those columns. Per NDS 97 sec. 15.3,
I have problems to justify the design. But I have been told, they built
thousands of houses like these, none of these columns failed. Please help me
Helen Zhou PE
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