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Re: Engineer's duty to public safety?[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: seaoc(--nospam--at)seaoc.org
- Subject: Re: Engineer's duty to public safety?
- From: nmoore(--nospam--at)innercite.com
- Date: Sat, 14 Mar 1998 19:16:14 -0800
Brian: I'd be careful first. The other engineer may have a standard tower that is rated for 70 mph, but may not have control over where it was placed. That is, he designs a standard tower that would be appropriate for a 70 mph wind, but his company or a purchaser puts these towers all over the place, ignoring local codes. I know of a case where a 105 mph wind knocked down a tower. The owner replaced it with a tower rated at 80 mph. But, here again you must be careful. The tower is designed to be operational at 80 mph; that is the tower doesn't rotate, say more that 1 degree or maybe 2.5 degrees, but the survival wind may be 110 mph. A transmission tower with wires seems to be a different animal; but if it has dishes instead, then the classification may be 70 mph with a 1 degree rotation and the demand/capacity ratio of the tower itself may be quite low. Hope I'm not too convoluted and I don't think your talking about one of my towers. I imagine that you are talking about the Lake Tahoe area? Neil Moore, S.E. >What if you know of a structure by another engineer that was designed to a 70 >mph windspeed in a code-required 110 mph area? > >Assume there's no occupancy, such as with transmission towers.... >
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