Study On Flexural And Vibration Behavior Of Cold-formed Thin-walled Steel Cement Fiber Board Composite Floor

In order to explore the flexural performance and vibration performance of the cold-formed thin-walled steel beam cement fiberboard composite floor,the flexural performance and vibration performance of two full-scale specimens of the cold-formed thin-walled steel beam cement fiberboard composite floor are studied in this paper.The composite floor is simulated and analyzed by ABAQUS finite element software,and the correctness of the finite element model is verified by comparing the simulation and test results.Based on the bending test,the load deflection curve,stress development process and the cooperative deformation characteristics of cold-formed thin-walled steel beam cement fiberboard composite floor are analyzed.The research shows that the deflection deformation of two cold-formed thin-walled steel beam cement fiberboard composite floors meet the specification requirements under the action of standard combined load and basic combined load.Further,ABAQUS finite element software is used to analyze the bending performance of the composite floor model,and explore that the thickness of cement fiberboard,the layout spacing of self tapping screw connection between cement fiberboard and purlin,the spacing of purlin and the cross-sectional characteristics of side beam will affect the deflection and bending capacity of cold-formed thin-walled steel composite floor.Based on the vibration test,the natural frequency of the cold-formed thin-walled steel beam cement fiberboard composite floor,the vibration response of the composite floor under different working conditions and the variation characteristics of the vibration comfort of the composite floor are analyzed.The research surface: the natural frequency of the two composite floors meets the limit requirements of the relevant specifications,the peak acceleration does not meet the limit values of the relevant specifications,and the vibration comfort needs to be improved;Filling foam concrete and laying decorative surface layer can improve the vibration comfort of composite floor to a certain extent.Further,ABAQUS finite element software is used to analyze the vibration performance of the composite floor model,and the effects of boundary conditions,cement fiber board thickness,purlin spacing,different edge beam shapes,filled with foam concrete and other factors on the vibration performance of the composite floor are explored.The research results can provide scheme optimization and reference for the design and application of cold-formed thin-walled steel beam cement fiberboard composite floor.