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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