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An new long-span assembly composite floor system for use in multi-column frame-tube structure is presented.The basic assembly unit consists of steel truss keel and profile sheet concrete composite slab, which of the two parts are combined together through shear stud.By means of standardized assembly connection structure,such a new floor system can realize a rapid assembly of floor and support frame.Based on test research of 1/3 scale model,the paper discusses the in-plane mechanical performance of

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A kind of steel frame assembly applicable to high rise building is proposed herein. The composition of system, the technology characteristics of components and connections are analysed in detail. Based on the simplification of analytical model for the truss beam and beam-column connection, a simplified structural analysis method is also proposed. Finally, an application case is given to verify the effectiveness of the simplified analytical method. The results show that the simplified method produces good accuracy and it can meet the requirements of engineering structural analysis and design.