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What does G4 mean in common sense?
G4 stands for four structural steel bars.

When the beam reaches a certain height, there will be structural reinforcement or anti-torsion reinforcement besides bottom reinforcement, gluten and stirrup. When the beam is marked, the structural reinforcement is represented by G, and the torsional reinforcement is represented by N. ..

Flat method is a kind of drawing method to express structural size, elevation, structure and reinforcement. It is the structural construction drawing used in the building.