Design of Wood Structures ASD/LRFD - Donald E. Breyer
Design of Wood Structures ASD/LRFD - Donald E. Breyer
(OP)
I noticed the 6th edition of Donald E. Breyer's Design of Wood Structures has ASD/LRFD.
In practice is ASD still being used? Or are designers heading towards LRFD?
I have the 3rd edition of Donale E. Breyer's Design of Wood Structures and was interested in reviewing it again for my personal knowledge and to get more experience in wood design.
Should I be alright by looking at this ASD book (3rd edition) or should I consider looking into LRFD desig?
THANKS
In practice is ASD still being used? Or are designers heading towards LRFD?
I have the 3rd edition of Donale E. Breyer's Design of Wood Structures and was interested in reviewing it again for my personal knowledge and to get more experience in wood design.
Should I be alright by looking at this ASD book (3rd edition) or should I consider looking into LRFD desig?
THANKS





RE: Design of Wood Structures ASD/LRFD - Donald E. Breyer
http://www.awc.org/Standards/nds.html
IMHO, Breyer offers the best books on wood (any edition). Oddly enought, the most important change in recent years has nothing to do with either ASD or LRFD. Allowable shear in lumber almost doubled from NDS 1997 to NSD 2001 - there was a decades long mistake in how shear was accounted for. Here is a summary and explanation
http://
If you use an older reference, be sure to keep this in mind.
www.SlideRuleEra.net
RE: Design of Wood Structures ASD/LRFD - Donald E. Breyer
I have years of experience using ASD which I can relate to. Since the 1991 NDS there have been a lot of changes. I am very skeptical of some of the changes which were made.
For example with the design equations for bolts, you plug in a lot of numbers and get an answer. However when you get an answer you have no feel for its accuracey. I find my self comparing it to the design value under the 86 NDS.
With newer research on wood connections and further changes in the NDS, I find my skeptcism of the 91 NDS increasing.
From people I've talked to, if I sat down and worked my way through LRFD, I would probably start using it.
RE: Design of Wood Structures ASD/LRFD - Donald E. Breyer
RE: Design of Wood Structures ASD/LRFD - Donald E. Breyer
The PE exam is still based on ASD for wood, at least through 2007. You can't go wrong learning both, I suppose.
RE: Design of Wood Structures ASD/LRFD - Donald E. Breyer
This is one of my greatest concerns with LRFD. The community is telling me that you no longer have to check deflections and stuff like that. I say BULL! If I'm getting 12 inches of deflection in a 30 ft member, I'm going to increase the MOI, period.
In wood, I'd accept some sort of LFD design theory so that a larger Factor of Safety could be applied against live load, but it is still a basic solids of mechanics type material, so I'm going to treat it that way.
RE: Design of Wood Structures ASD/LRFD - Donald E. Breyer
You could still use higher FOS for live load with ASD if you want to. I do it all the time.
RE: Design of Wood Structures ASD/LRFD - Donald E. Breyer
Deflections are indeed addressed in the document. The IRC prescribes limits for deflection so that would necessitate checks anyway. I have never heard the assertion that LRFD requires no deflection checks. Any designer who neglects servicibility will no doubt find himself in hot water.