I. Steel Structure Materials and Types   There are three types of steel for high-rise building steel structure: ordinary carbon steel, ordinary low-alloy steel and heat-treated low-alloy steel. Ordinary carbon steel is still widely used. At present, Q355 and Q235 steel is the most commonly used in construction steel structure in China. Based on the importance of high-rise steel structure, cold bending test, impact toughness, yield point, tensile strength and elongation are listed as the five basic requirements of steel mechanical properties, and only those steels that are qualified for these five indicators can be used. For seismic high-rise steel structures, the yield ratio of steel should not be less than 1.2, and for steel structures with fortifications above 8 degrees, the yield ratio should not be less than 1.5. There is an obvious yield step, the elongation should not be less than 20%, and it should have good ductility and weldability. For steel columns, in order to prevent laminar tearing of thick plates, the content of sulfur and phosphorus needs to be further controlled and should not exceed 0.04%. II. The Advantages of High Rise Building Steel Structure   1. Can reduce the area occupied by the structure in […] read more