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RE: Lateral Analysis Software for Wood Structures?[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: seaint(--nospam--at)seaint.org
- Subject: RE: Lateral Analysis Software for Wood Structures?
- From: "Haan Scott M DPW CIVIL ENGR(n)" <scott.haan(--nospam--at)richardson.army.mil>
- Date: Tue, 12 Nov 2002 17:21:51 -0000
Why doesn't the code just come out with a provision: "All wood panel shearwall buildings shall have a 3-D finite element model and a response spectrum analysis" ? I don't have a problem buying software but my answer to the new published design guide wood building methodologies is: where are the bodies? My college timber design Breyer's text flexible diaphragm and stiffness proportional to length method used to work so why does it not work now? I am all for safety but come on, I don't think my local market is willing to pay for the proposed analysis time. I think the codes should take a step back and specifically allow the old wood building simplification conventional assumptions of stiffness proportional to length, flexible diaphragms, and drift checks not required for wood buildings. Handle drift with the "simplified method" and 2:1 aspect ratios.
I think that the market is unwilling to bear the cost of an analysis of a timber frame building that requires calculating wall stiffnesses, rigid diaphragms and story drift checks, funky drag strut load combinations, etc... I think the increased accuracy or safety is usually nebulous for most wood frame construction. The extra design time is probably a waste because undoubtably someone is going to decide to put a huge window in the one wall holding the building up after the engineer spent 16 hours analyzing the building by hand and with spreadsheets and then will have to start from scratch.
Also high period for wood buildings? Does your house resonate violently when your dryer has a wet comforter in it or when you walk down the hall? Although it is contrary to the popular world view, most residential wood buildings have very short periods because they are light and stiff. The periods are probably so short that they would land in the ramp area of a response spectrum and have less input, but the code does not allow you to do that. Maybe the code could allow the response spectrum "ramp" to be used for wood buildings.
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