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RE: ASCE vs AWWA[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: "'seaint(--nospam--at)seaint.org'" <seaint(--nospam--at)seaint.org>
- Subject: RE: ASCE vs AWWA
- From: Harold Sprague <harold.sprague(--nospam--at)neenan.com>
- Date: Thu, 19 Nov 1998 10:11:11 -0700
Randy, AWWA has lagged behind the ASCE 7-95 on wind design. The ASCE 7-95 is predicated on a 3 second gust. I believe the AWWA D-100 is still predicated on a fastest mile wind. I ran into a similar situation for a liquefied natural gas plant. I insisted on the ASCE 7-95 for wind. I would use the ASCE 7-95 for wind, but the AWWA D-100 is better for seismic. Look at the probability of excedance, and you may even conclude that you need a higher velocity. You might also want to convert the Saffir-Simpson scale velocities to 3 second gusts. It will give you the information about what level of hurricane you could resist. Regards, Harold Sprague, P.E. harold.sprague(--nospam--at)neenan.com <mailto:harold.sprague(--nospam--at)neenan.com> -----Original Message----- From: Randy Russ [mailto:rruss(--nospam--at)eatel.net] Sent: Thursday, November 19, 1998 9:15 AM To: seaint(--nospam--at)seaint.org Subject: ASCE vs AWWA I have been comissioned to design a foundation for a 225' water tower. The tower will be designed by a tank vendor with proper professional registration. They are using AWWA D100 standards. I am using ASCE 7 to determine proper wind forces on the foundation. I am not that familiar with AWWA. AWWA states that the actual wind velocity should be used but should not be less than 100 MPH. It gives no means to determine what velocity should be used and it gives no means to determine when a different velocity should be used. ASCE 7 gives good info on this subject. I am designing the foundation for 120 MPH ASCE 7-95. I suggested that my client put into his specs to use ASCE 7 and/or AWWA. He refuses. He also refuses to put in a higher AWWA wind speed even though this is < 100 miles from the Gulf Coast. The foundation will be designed with ASCE 7 or AWWA (whichever is most stringent). Do I drop the subject and hope for the best or do I insist that the client change his performance spec for the tank. Most of y'all are earthquake hounds but how about a little feedback for us hurricane folk? This project is out in the boonies and there are no local governing codes.
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