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RE: Upgrade Fatigue?[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: seaint-seaosc(--nospam--at)mail-list.com
- Subject: RE: Upgrade Fatigue?
- From: <jadair(--nospam--at)shwgroup.com>
- Date: Wed, 10 Apr 2013 22:12:45 +0000
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I feel your pain with transitioning to the new wind provisions. I did a project in a jurisdiction in west Texas that has already adopted IBC 2012 / ASCE 7-10. The questions I got were from the curtain wall designer, who was having a hard time figuring out how he was going to make his system work with 120 mph wind (I know -- no big deal in Florida). He had done all kinds of projects in that area with 90 mph wind, and was sure that my documents were wrong. I had a hard time trying to explain to him that the new 120 mph wind was the same as the old 90 mph wind. In fact, because of the reshuffling of load factors, gust factors, importance factors, etc., the new 120 mph might actually result in a LOWER design pressure by a few percent. I wanted to tell him, "Just do what you would normally do, and it'll all be fine." But, of course, they need to follow the provisions of the current code, as well. I don't know if their engineer took the plunge and got up to speed with ASCE 7-10, or if he just decided to leave that effort for another day. -- Joel Adair SHW Group Plano, TX -----Original Message----- From: seaint-seaosc(--nospam--at)mail-list.com [mailto:seaint-seaosc(--nospam--at)mail-list.com] On Behalf Of Carl W. Jenne, P.E. Sent: Wednesday, April 10, 2013 4:03 PM To: seaint-seaosc(--nospam--at)mail-list.com Subject: RE: [SEAINT-SEAOSC] Upgrade Fatigue? In Florida we've already adopted ASCE 7-10. The revised wind provisions with its different wind speeds have been a real hassle to explain to architects. Architect: "What's the wind speed in that location?" Us: "It depends. The wind blows harder on a hospital than it does on an office building." In order to save us the trouble of multiplying by 1.15 they increased the physical size of the code and opened a can of worms. Ever try to explain mean recurrence intervals to an architect? Having said that, it's not within our power to refuse to go along. All we can do is kvetch. Though Florida doesn't have seismic problems (by legislative fiat) we also design in other locations. Here's a dramatically oversimplified illustration of a AISC 341 catch-22: In an ordinary concentric braced frame, you’re (theoretically) allowed to use K-braces. In order to make sure you don’t have buckling in the Truncated 3415 characters in the previous message to save energy. ------------------------------------------------------------------------- Post your message to the list by sending it to: SEAINT-SEAOSC(--nospam--at)mail-list.com. The email messages sent to the list will be saved in an archive on the World Wide Web. These archives are located at: http://archive.mail-list.com/SEAINT-SEAOSC To contact the list owner, send your message to: SEAINT-SEAOSC-list-owner(--nospam--at)mail-list.com. 5700 Ralston Street, Suite 300, Ventura, CA 93003 To unsubscribe, switch to/from digest, get on/off vacation, or change your email address, click here. <http://cgi.mail-list.com/u?ln=seaint-seaosc&nm=seaintma%40euken.net>
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