Four full scale cold-formed steel composite floors with different patterns of configuration were dynamically tested to study the vibration behavior. In the service stage, when the space between screws connect the profiled steel sheet and the cold-formed steel joists were changed, or the rigid blocking, end constraints, floor live load were different,effects to the fundamental frequency of composite floor were studied. The study shows that the fundamental frequency declines with the increase of the floor live load, and the fundamental frequency can be improved by reducing the space between screws, setting rigid blockings at mid-span of adjacent joists, or strengthening the floor end constraints. Through modal analysis of the vibration behavior of the experimental mode under 24 load cases with ANSYS FEM, the FEM results are in good agreement with the experimental results. Finally, a formula to forecast the fundamental frequency preferably is proposed. Under nominal combination of loads during service stage, 10Hz is suggested as the fundamental frequency of the composite floor.
composite floorcold-formed steel joistfundamental frequencyexperimental studyfinite element modal analysistheoretical formula
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