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Wind Pressure Below Grade? N[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: <seaint(--nospam--at)seaint.org>
- Subject: Wind Pressure Below Grade? N
- From: "Brian A. Peterson" <petersonb(--nospam--at)psns.navy.mil>
- Date: Wed, 2 Sep 98 15:16:01 PDT
Hi, I am looking for information and/or opinions on wind pressures at the below grade level. We install temporary containment structures in graving docks to blast/paint ship's structure. The docks are 30 to 60 ft. deep adjacent to the water's edge, and ~100 ft. wide by ~1000 ft. long. A containment may be installed in the base of the dock then rise above the "ground" level. For design, at above dock height I use standard wind load calculations from UBC and/or ASCE 7-95. At dock height and below, for lack of other criteria, I have used 10 psf based on ASCE 7-95 "minimum design wind loading." Depending on the depth below "ground" level, this may or may not be conservative. To add to the problem, any ship in dock will undoubtedly have a channeling effect on the wind- but that's another story. Barring major wind tunnel testing (not justified for temporary structures(?)), I would like an idea of whether or not I am on track with these assumptions. Any help is appreciated. Brian Peterson, P.E. Puget Sound Naval Shipyard Bremerton, WA
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