Study On Cold-Formed Steel Concrete Frame System Applied In Multistory House

By the comparison and analysis of house system in China and other countries, the author bring forward the cold-formed steel concrete frame system applied in multistory house. The system is composed with concrete filled cold-formed square steel tube column, the beam with two cold formed C type steel welded together back to back, the slab with profiled-steel and concrete, the beam and the slab joined into composite steel-concrete beam. They all together make up of the bearing members. And the house also includes the light economical-energy sources heatproof walls. Since the plate is wider and molding manner is agility, the cold-formed steel is a kind of high effect and economical material. But it is easily inflection when the pressure is bigger and it is adapted to being used tension members. The concrete is lower in price and has the good compression performance. So, the combination of steel and concrete can exert the two material's preponderance respective, at the same time, because the steel pipe stipulation core concrete function, that will make the steel pipe concrete load carrying capacity increase, used for the residence building, and can economize the material with increase the room usage area.According to the characteristics of concrete filled cold-formed square steel tube, the paper discusses the condition that all pieces of the square steel pipe have effect. At the same time, A comparison with United States LRFD Code, European EC4 Code and China GJB Rules has progressed. For guiding engineering practice, the paper arranges different thick steel pipe and different strength concrete and draws a conclusion of the best combination. For the subject of house, the paper studies the form of this kind of special combination beam named flat beam for big space. The joint is the key point linking the beam and column and according to the paper's structure system, the author bring forward the reinforce ring-bearing melt joist and has a finite element analysis making use of the finite element program ANSYS. After the analysis about main body members, the paper analyzes the steel's fireproof, especially discusses the increasing of fire resistance time because of the existence of core concrete. Further more, the paper particular argues the erode-proof on steel architecture. In answer to the policy about economical-energy sources, the text illuminates the use of wall materials and the windows saving energy. At the last, according the theory mentioned in the paper above, the author carry through a calculation example, and compares it with the reinforcedconcrete frame system and the H shape steel frame system in the same condition.