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STEEL OPEN-WEB SANDWICH FLOORS (SOSFS) HAVE BEEN APPLIED IN SEVERAL PIONEERING INDUSTRIAL AND PUBLIC BUILDINGS. THE TRADITIONAL SQUARE TUBE SHEAR KEY (STSK) OF THE STRUCTURE IS CHANGED INTO A FLANGED CRUCIFORM SECTION SHEAR KEY (FCSK) TO FURTHER IMPROVE THE BEARING CAPACITY OF SOSFS. A HALF-SCALE TEST MODEL IS DESIGNED. THE MANUFACTURING METHOD OF THIS NEW STRUCTURE IS INTRODUCED WITH MODEL PROCESSING TAKEN AS AN EXAMPLE. A GRADED STATIC LOADING TEST IS PERFORMED TO MEASURE DEFLECTION AND STRAIN. THE CALCULATION FORMULA OF THE INTERSECTION BEAM ANALOGY METHOD (IBAM) CONSIDERING THE INFLUENCE OF SHEAR STIFFNESS IS PROPOSED. A FINITE ELEMENT (FE) ANALYSIS WAS ALSO PERFORMED. THE RESULTS OF THE TEST, IBAM AND FE METHOD ARE COMPARED. THE MAXIMUM DEVIATION OF THE DEFLECTION OBTAINED BY THEM IS LESS THAN 5%, AND THE MAXIMUM STRAIN ERROR IS LESS THAN 7%. THESE FIGURES PROVE THAT ALL THREE METHODS HAVE HIGH PRECISION IN THE ELASTIC RANGE. COMPARED SOSFS USE DIFFERENT SHEAR KEY WITH THE SAME GRID SIZE AND THE SAME CHORDS, THE MAXIMUM MISES STRESS IS REDUCED BY 55.9% AND THE MAXIMUM DISPLACEMENT IS REDUCED BY 36.1%. THE NEW SHEAR KEY IMPARTS THE STRUCTURE WITH IMPROVED BEARING CAPACITY, INTEGRAL RIGIDITY, AND SAFETY STORAGE.
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