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Re: Steel Dome Deisgn

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>Does anyone know of any good references specifically for steel dome
>structures?
You'll probably need to get comfortable with the mechanics of plates and 
shells and biaxial stress fields. Suggest you link to the Linda Hall 
Engineering Library or your large university library of choice and do a 
couple of searches on books for plates and shells for references. The 
prime referemce is Timoshenko's _Plates and Shells_ but you'll find 
others listed when you do the library search. When you find one that 
sounds right, shop around at second-hand book dealers web sites for the 
titles you like. You may still be able to get a publication of the AISI 
and Steel Plate Fabricators Assn called Design of Plate Structures Vol 2 
Useful Information...

It's possible to do limit analysis with such structures, but it's nothing 
like LRFD, so you may be stuck with adapting ASD rules. The approach is 
usually to use a stiffened plate or shell rather than a full monocoque to 
address stability issues. Lots of simple shapes can be calculated with 
closed form methods a la Roark. or others. The trick is generally 
balancing the economics of thick shells with few stiffeners against 
thinner lighter shells with more stiffeners. Shells to not take kindly to 
loads which cause local bending, and your main concern will be direct 
stress which you can keep at 60% of the yield value to get equivalent 
strength to ASD rules. You can estimate buckling with closed form 
relationships and address them with the same safety factors against 
buckling as you'd use for ASD, although shell buckling is not the same as 
Euler buckling in columns.

Pay attention to plate and shell mechanics when you get into unfamiliar 
territory and resist the urge to assume that everything is some sort of 
equivalent hipshot beam because it isn't.

Christopher Wright P.E.    |"They couldn't hit an elephant at
chrisw(--nospam--at)skypoint.com        | this distance"   (last words of Gen.
___________________________| John Sedgwick, Spotsylvania 1864)
http://www.skypoint.com/~chrisw


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