Grade properties of commonly used steel structural steel 1 carbon structural steel: Q195, Q215, Q235 other 2 low alloy high strength structural steel 3 high quality carbon structural steel alloy structural steel 4 special purpose steel

2. The principle of material selection for steel structure the principle of material selection for steel structure is to ensure the bearing capacity of load-bearing structure to prevent brittle failure under certain conditions, according to the importance of the structure, load characteristics, structure form, stress state, connection method, steel thickness working environment, etc. . The four types of steel proposed in the code for design of steel structures (GB50017-2003) are“Suitable” for use. They are the first choice when the conditions permit, do prohibit the use of other types, as long as the use of steel to meet the requirements of the specification can be.

3. The characteristics of steel structure 1. The steel structure is lighter in weight 2. The reliability of steel structure is higher 3. The anti-vibration (earthquake) anti-shock of steel are better 4. The industrialization degree of steel structure manufacturing is higher 5. The steel structure can be assembled accurately quickly 6. The steel structure is easy to be made into a sealed structure 7. The steel structure is easy to corrode 8. The steel structure has poor fire resistance