What are the accessories in the steel structure?
The annex to the steel structure is a very general statement. First of all, you have to understand what steel structure you are talking about.
General steel structure project includes: steel column beam system, system, support system, connection system, system, and stair brace purlin. This is a part of every steel structure project. (single door, no stairs), you said the attachment should be the maintenance system.
The maintenance system includes: roof and wall inside and outside pressure plate (a single plate project) and thermal insulation layer, and various accessories, standard parts, gutter drainage wall and roof lighting and window part.