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RE: Tall signs[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: seaint(--nospam--at)seaint.org
- Subject: RE: Tall signs
- From: "James Cohen" <JCCPC(--nospam--at)classic.msn.com>
- Date: Sun, 23 Aug 98 19:40:22 UT
50 mph is unlikely to meet any local code in theory, or reasonable wind storm in practice, whether you are referring to sustained wind or gusts. As wind pressure is proportional to the square of the wind speed and your minimum design wind is unlikely to be less than 90 mph (I do not know where your structure is located), your client should be left with either the choice of having the structure removed or strengthened. All your factors of safety for materials, design, etc. have been used up on your loads. You may find that your structure is even insufficient for temporary construction loading, which would allow for much smaller return periods on wind. Regarding an earlier post, I would not wish to rely on failure of the canvas to reduce your loads without an actual test. There may be sufficient drag even from torn material to keep your loads beyond any safe level. James Cohen, PE ---------- From: Alex C. Nacionales Sent: Friday, August 21, 1998 18:02 To: seaint(--nospam--at)seaint.org Subject: Tall signs Thank You for your comments. The revised sign structure with canvas sign installed, can handle winds up to 50 mph(80kph) . Do you have any data about sudden gusts that exceed the above wind speed? Thanks again. ALEX C. NACIONALES,C.E.
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