Seismic Design of Condenser Unit Supporting Steel Structure - NonBuilding structure

[Delmarva_Struct]

I am required to design a condenser supporting steel structure for seismic loads. It will consists of 4 steel columns and tension only x bracing between the columns. There will be a network of beams connecting the columns at the top, thus forming a platform on which the condenser unit will be anchored. The condenser weighs around 100000 lbs.

I am not able to figure out if this is a Non-building structure similar to buildings or NOT similar to buildings. Also, Which structural elements need to be designed for overstrength?

 

[driftLimiter]

The basic framing scheme and lfrs of this sounds pretty similar to a concentrically braced steel frame, or perhaps a trussed tower. If you look at table 15.4-2 for trussed towers it refers to Sec. 15.6.2 when you go to this section they are talking about other types of structures that are not so similar to what you describe.

I would look to table 15.4-1, determine which building frame systems you are permitted to use. The detailing requirements indicated on this table should answer your question about which elements require overstrength.