Super high-rise steel structure

High rise and super high-rise structure, generally considered the total height of the building is more than 24m for high-rise buildings, the total height of more than 60m for the construction of super high-rise buildings. For structural design, according to the different functional requirements of building use, building height and the field of seismic fortification intensity to the design principle of economic, reasonable, safe and reliable, choose the corresponding structure system, generally divided into six categories: frame structure, shear wall structure and frame shear wall structure system frame - tube structure system, tube in tube structure, beam tube structure system. The high-rise and super high-rise buildings in structure design in the reinforced concrete structure (code RC), but also the use of steel reinforced concrete structure (code SRC), steel tube concrete structure (code CFS) and steel structure (S or SS). Southeast science and technology R & D center, building height 100m, column 8.4m, seismic fortification intensity is 6 degrees, the frame shear wall and frame tube structure system is more economical and reasonable use, shear wall or cylinder of this structural system is the lateral force resisting members very good, often bear most of the lateral wind load and earthquake the load force produced by the overall stiffness, lateral displacement, and meet the requirements of decorative glass curtain wall.

The selection of material has many advantages, but its disadvantage is that the coefficient of thermal conductivity is large and the fire resistance is poor. With the development of metallurgical technology, the research of refractory steel was successful and put into production, which created the conditions for the further development of steel structure. At present, there are two types of refractory steel, B400RNQ and B490RNQ, which are put into production, which can meet the requirements of structural steel, such as physical and chemical indexes, chemical properties, impact toughness and weldability. Ordinary steel when the temperature reached 600 degrees Celsius has completely lost the carrying capacity, Baosteel production of these varieties of steel when the yield strength of 600 degrees to reach the temperature of 150 ~ 220Mpa ~ two. General high-rise and super high-rise buildings when the frame shear wall and frame tube structure when the economic statistics system for steel structure steel cost = cost (about 40%) + production installation costs (about 30%) + fire retardant coating costs (about 30%), the total cost of the fire retardant coating proportion. If the use of high strength refractory steel prices rose slightly, but the price of fire retardant coatings have decreased significantly, is expected to partially offset the rising costs, but also a certain degree of reliability and security. The application of high strength refractory steel in high-rise and super high-rise buildings, also shows the southeast group in the use of new materials, new technology, a major initiative.

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