The difference between heavy steel and light steel
There is indeed no uniform standard for determining whether a structure is heavy steel or light steel; even many experienced designers and project managers often struggle to explain it clearly. However, we can make an informed judgment by considering a range of data in combination:
Heavy steel structure
1. Overhead crane lifting capacity: ≥25 tons.
2. Steel consumption per square meter: ≥50 kg/m².
Light steel structure
It refers to a lightweight steel structure fabricated from round steel and angle steel with dimensions smaller than L45×4 and L56×36×4. Neither national codes nor technical documents recognize the concept of “heavy steel.”
The “Code for Design of Steel Structures” GBJ 17-88 was repealed effective December 1, 2003; the currently applicable code is the “Code for Design of Steel Structures” GB 50017-2003.
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