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- To: seaint(--nospam--at)seaint.org
- Subject: Re: R value for log walls
- From: "Peter McCormack" <pmac(--nospam--at)realloghomes.com>
- Date: Mon, 13 Dec 1999 09:49:34 -0500
- Priority: normal
Everyone Thanks for your comments. I have been away since posting my message. I was rushing to catch a plane while preparing the message, so I may have been a little vague about which R value I wanted info on. R = Response modification factor as I am developing a Mathcad template for seismic design.... Charles, thanks for your suggestions on developing an R value for log buildings. I will persue this, purely on the basis of...someone has too. I am suprise that no one has done any research/design/development as there are a lot of log home manufactures out there, and a lot of buildings requiring an engineers approval. The journey begins..... Peter McCormack Date sent: Wed, 08 Dec 1999 15:59:28 -0800 To: seaint(--nospam--at)seaint.org From: Charles Greenlaw <cgreenlaw(--nospam--at)speedlink.com> Subject: Re: R value for log walls Send reply to: seaint(--nospam--at)seaint.org Organization: http://www.seaint.org > At 02:31 PM 12/8/99 -0500, you wrote: > >I am in the process of developing a MathCAD template for > >determining seismic loads per UBC. > > > >However, I need to determine a realistic "R" value to assign to log > >walls acting as both shear and load bearing walls. Obviously, a wall > >constructed of logs stacked 1 above the other has a higher density > >than a light framed shear panel, but is not as dense as a concrete > >or masonry log wall. > > > >Does anyone have any suggestion, is there a calculation method to > >determine it based on the material density??? > > > >Any help will be appreciated > > > >Peter McCormack > ------------------------ > Peter, a great opportunity knocks for you. > > Other replies, especially by "sasquake", call attention to the committee > process as the source of seismic R values for various forms of construction. > It appears that no committee has yet undertaken to set an "R" for log > houses. In my experience on such committees, and following things since > then, a special coefficient for such an esoteric form of construction would > be tasked to one single person. If that person came back with a lot of > numbers on paper, etc., and presented the recommended outcome in a > self-assured, authoritative manner, then acceptance by the rest of the > committee with little hassle is very likely. Once that happens, the outside > reviews and cementing of the R factor outcome with the vaunted "consensus > process" proceeds apace. Ben Yousefi told us how that consensus position > becomes impenetrable armor against later challenge, especially one from an > individual. > > So, you aren't on the committee, let alone a long-term member of it? For > shame! But all is not lost: Imagine you are a committee member, using > affirmation techniques and whatever else it takes to become a believer. > Behold: The committee has given you the job of developing the "proper" > R-value for log houses. Do it. Read up on the SEAOC Blue Book Commentary, > and maybe ATC and NEHRP commentaries to get a flavor of the rationale and to > pick up ease with the jargon. Then make up your mind firmly and set forth > your R value with resolve. That's how to do it. > > You don't have to furnish any scholarly explanation, or even any simple one, > because someone else writes up all that for the next edition of Commentary > later. Just be forceful in presenting it orally in committee, in your mind. > Then use this R value. > > Now, watch out for any second thoughts. You absolutely have to wrap yourself > in the mystique of committee membership, in your mind, even though you are > an individual. This is the magic that distinguishes you from any other > individual, such as the hapless one who submits a challenge during that > eleventh hour step in the final code approval process. > > Good Luck, and Unshakeable Resolve. When you're done, tell us what R value > we have to follow. Logs "R" Us. > > Charles O. Greenlaw, SE Sacramento CA > > >
- Re: R value for log walls
- From: Charles Greenlaw
- Re: R value for log walls
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