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Seismic requirements for cladding[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: seaint(--nospam--at)seaint.org
- Subject: Seismic requirements for cladding
- From: Jack_Creviston(--nospam--at)Kawneer.com
- Date: Wed, 18 Aug 1999 15:06:46 -0500
I'm an engineer with an aluminum curtainwall/storefront manufacturer in the midwest. I am increasingly seeing seismic performance criteria in architects' specifications. Unfortunately, I have no real experience with the subject. What I have deduced from the various building codes is that windloading will generally govern the design as it averages 2-5 times higher than the calculated seismic forces. Here is my concern: It is very rare that a complete set of prints, to include the structurals, are sent in for evaluation. In fact, its not uncommon for me to have no idea what the surrounding building conditions are. So, I determine the maximum allowable story drift by code and then make accommodations for this movement. The movement is accommodated by the use of receptor channels; the channels are anchored to the surrounds and the framing is allowed to "float". Does this seem like a good idea? The more I think about it the more concerned I am that this will cause more damage than simply anchoring the frame to the surrounds. Would the freedom the channels allow be more apt to cause glass breakage and/or failure of the gaskets? I guess the real questions is: how's it done in sunny California?
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