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RE: Ceiling Lateral Bracing[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: "'seaint(--nospam--at)seaint.org'" <seaint(--nospam--at)seaint.org>
- Subject: RE: Ceiling Lateral Bracing
- From: Harold Sprague <harold.sprague(--nospam--at)neenan.com>
- Date: Fri, 23 Jul 1999 12:33:48 -0600
Medi, I have done design work all seismic zones. The code is not specific in what to do for seismic zone 1 (as it should be), but if there is no applied force prescribed in the code, the practice is to not provide the bracing. Kansas City in older codes, was a seismic zone 1, and the ceilings were not braced. From the early 80's Kansas City went to a seismic zone 2A, and some of the firms started to require braced ceilings. When the 2000 IBC comes out we will show that the braced ceilings in the 80's and 90's were not required for Kansas City. Such is the progress of our code development. By the way, the most effective system for bracing ceilings is the Chicago Metallic Dyna Strut system (a rigid system), which may have died from neglect. In actual earthquakes the UBC system has not been as effective as assumed (it takes a lot of movement to tighten the wires). The UBC system is not too effective, but it is cheap, and "we've always done it that way" (I hate that statement). There was some research on this topic that I dug into a few years ago. My advice would be to look at the 1997 NEHRP and see if the requirements might be kicked in with the 2000 IBC. If it looks like they aren't required now, and they won't be required in the foreseeable future, save your client some money and delete them. Regards, Harold Sprague The Neenan Company -----Original Message----- From: Medi Givechian [mailto:GIVECHM(--nospam--at)sverdrup.com] Sent: Friday, July 23, 1999 11:17 AM To: harold.spraque(--nospam--at)neenan.com; seaint(--nospam--at)seaint.org Subject: Ceiling Lateral Barcing Harold: Thank you for your response to my question in the seaint list server. You stated that lateral bracing and compression struts are not required in zone one (1). Is this your opinion or you may have a reference? Is your company involved in ceiling installations? Basically I need some good reasoning to convince an owner that we don't need bracing, since it was not included in our construction budget. Please reply. Thanks again Medi Givechian, P.E.
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