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1.The steel structure of the connection method:?welding connection or bolt connection2.Steel structure design common norms are as follows:& quot;Steel Design Code& quot; (GB50017-2003)& quot;Cold-formed steel structure technical specifications& quot; (GB50018-2002)& quot;Construction Quality Acceptance of Steel& quot; (GB50205-2001)& quot;Technical Specification for welded steel structure& quot; (JGJ81-2002, J218-2002)& quot;Technical Specification for Steel Structures of Tall Buildings& quot; (JGJ99-98)3.Commonly used steel grades and performance of steelCarbon structural steel: Q195, Q215, Q235, Q255, Q275, Q345,etc.High-strength low-alloy structural steelQuality carbon structural steel and alloy structural steelSpecial purpose steel4.Market: Hangar have been all over the country more than 20 provinces, municipalities and autonomous regions, and have been exported to Europe, North America, the Middle East, Africa, Asia and other countries and regions, the widespread use.Welcome to our factories,we assure that our hangar will satisfy your needs with designs,competitive performance price ratio and best services.5. Steel structure prefabricated hangar technical information:For the steel structure prefabricated hangar, the important part is professional hangar door and the steel frame for the door.1)If the span is very large, it is better to use space truss, which will look nice and more economically, please see the followed drawings.2) If the span is small(less than 40m), use portal frame as main steel structure, but for the hangar door part need a special door frame with truss, like the followed drawings:?