Thanks guys for the info. There is one tank project in particular that is in northern Canada and is 60 feet in diameter. However, I am looking for general information on typical plate layouts, roof to shell connection, etc. Once I have some general information I will run it through our finite element program to analyize the stresses.
I am also looking for general information on how to construct these types of roofs, eg, are the plates rolled in two direction or cut flat to a particular pattern, then bowed during construction.
Carthago; I would be more than happy to share information with you.
I think design of roofs at least conical ones supported by a structure did start with Brownell and Young book " Design of process equipment",there is a dedicated chapter to tanks and it deals also with the structure supporting their roofs, with worked examples.
Major softwares like Tank and Etank are almost entirely based (for roof design) on this particular book.
The problem with Brownell book and with these software is
that they deal with simplified cases e.g.=
1- the roofs are horizontal
2- this means that supporting the beams and rafters
are also horizontal
3- this also means no horizontal reaction acting on the shell or on the inner ring.
Nevetheless this book can form a good basis nowadays to design almost roof type..
The details will generally be worked differently by different fabricators.
If the roof is dished to a radius, it's a "dome". If plates are rolled or formed in one direction only, it is an "umbrella". These two terms are often used interchangeably. Connections to the shell and at the top will vary, as will general layout of the roof itself.
If this is an actual tank, either in place or proposed, you'd need to speak to the fabricator for specific details.
I have found "Above Ground Storage Tanks" by Philip E. Myers to be a decent resource for tank design in general with some good info on roof design. Check it out on Amazon.
