Research On Vibration And Comfort Of Steel Truss Composite Floor Under Pedestrian Load

With the sustainable development of construction industry and the rise of assembly construction industry,more and more steel truss composite floor is applied in assembly construction.In engineering design,not only the bearing capacity of the floor should be considered,but also the vibration comfort of the floor should be satisfied.At home and abroad,the research on composite floor is more focused on the static analysis,less on its dynamic performance,lack of relevant research and theoretical analysis,and there is no specific standard for comfort design evaluation.Therefore,it is of practical significance to study the vibration comfort of reinforced truss concrete composite floor under pedestrian load.In this paper,the research contents and relevant conclusions about the vibration comfort of reinforced truss composite floor under pedestrian load are as follows:The finite element software ANSYS is used to analyze the modal analysis and transient analysis of two kinds of composite floor and cast-in-place floor.Through the analysis of the calculation results,the influence of boundary conditions on the natural frequency of each floor and the comparison of the vibration response between the composite floor and the cast-in-place floor are summarized.The vibration response of the composite floor is larger than that of the cast-in-place floor of the same size,and the vibration response of the compact composite floor is larger than that of the integral composite floor.After that,the influence of pedestrian path,pedestrian frequency,pedestrian number,damping ratio,thickness of post cast concrete and height of steel truss on the vibration comfort of two kinds of jointed composite floor and the vibration comfort of two kinds of jointed composite floor under different working conditions are studied.Among them,the more people,the higher frequency,the closer the path to the mid span composite floor,the greater the vibration response,and the vibration response is the largest when walking along the direction of the joint of the composite floor;the damping ratio and the thickness of the post pouring layer have a significant impact on the vibration comfort of the composite floor.Finally,the evaluation methods and indexes of floor vibration comfort in different countries and organizations are summarized,and different standards are applied to evaluate the vibration comfort of composite floor under different working conditions.The results of different evaluation standards have little difference,and the vibration comfort of the integral composite floor is better in all working conditions.