EXPERIMENTAL STUDY ON VIBRATION BEHAVIOR OF COLD-FORM STEEL CONCRETE COMPOSITE FLOOR

This paper introduces the experimental study on vibration behavior of 4 full scale cold-formed steel composite floors. The research is focused on the fundamental frequency of composite floor, which considering the influence of screw spacing and rigid blocking under different loading cases during normal use. The test apparatus and test methods are introduced in details. Then, the finite element analysis model of cold-formed steel composite floors is set up to study the vibration behavior. Finite element analysis results in this paper are close to those of the experiments. The results of the tests and finite element analysis show that the flexural rigidity of composite floor can be improved by changing the spacing of screws. The fundamental frequency of composite floor with large spacing of screws, that connect profiled steel sheet and the flange of joists, is smaller than the composite floor with small screw spacing. The lateral stability of joists can be strengthened; the flexural rigidity and frequency of composite floor can be increased by setting rigid blocking at mid-span of the adjacent joist of the composite floor. The fundamental frequency of composite floor increases if the end restraints are enhanced. It. is suggested that the fundamental frequency of cold-formed steel concrete composite floor should be more than 10Hz.