RE: steel design

Karthika,

I assume the diesel tank has frame members as well as plate elements.

If the frame members are made of steel sections, you can design them to various codes such as IS800-2007, AISC 360, EC3, BS5950, etc. There are several discussions in this forum dealing with those topics and you can find many models from users for those. You can also find several examples in the folder

D:\SProV8i SS6\STAAD\Examp\Ind

There is no built-in facility for designing steel plates. So, what you will have to do is run the analysis, take the maximum and minimum plate stresses of various types, and compare them against the allowable values. You could also run a buckling analysis of the model and make sure that buckling factor is greater than say, 1.5 for all the service load combination cases, and greater than 1.0 for the strength combination cases.

For information on which plate stresses to compare with the permissible values, here are some links

communities.bentley.com/.../252796.aspx

communities.bentley.com/.../273675

communities.bentley.com/.../278922

communities.bentley.com/.../11097.max-absolute-stress-in-plate-contour

communities.bentley.com/.../93508