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Re: Underground Structures

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     For loading, you should use a truncated inverted conic section at about 60 degrees from horizontal (or less if angle of repose dictates) that is 90' in height for the 100' dia. dome and larger cone for the 60' perimeter area.
     Ralph Kraentz (sorry Ralph if I misspelled) did the structural for Paeolo Solari (sorry Paeolo if I misspelled) ;>)  Ralph is/was on the list.

Greg

-----Original Message-----
From: Vinod Sahni <SAHNIVK(--nospam--at)nv.doe.gov>
To: seaint(--nospam--at)seaint.org <seaint(--nospam--at)seaint.org>
Date: Monday, August 07, 2000 10:08 AM
Subject: Underground Structures


>Harold Sprague and James Lutz :
>Thanks for your response which was very helpful.
>Regarding the question as to the nature of structure.......following is a
>brief description for information.
>It involves a hemisphere dome 100' diameter on top of concrete walls
>which are 50' high.  The top of the dome is located about 40' below
>ground. Tthe dome is surrounded by a covered concentric gallery about
>60' width.  Roof of gallery is about 125' below ground.  24 - 20' diameter
>semicircular tunnels coming towards the dome meet and stop at  the
>gallery in radial fashion.  All construction will be concrete. Other than
>tunnels which will be drilled,  it will be open excavation construction.
>For the conceptual design, I came up with 3' thick concrete with lots of
>reinforcement for the hoop stress.  Walls are 3' thick. The gallery has
>closely spaced 4'x4' columns with girders and beams (48"x60" or less)
>and a 12" roof slab. The tunnels will be precast other than the bulkhead
>entrance wall.  
>By the way the seismic zone is more like 2B and not 4 as I had given
>before.
>
>Thanks again for the response you gave.
>
>Vinod Sahni, SE
>
>
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