| With the vigorous advancement of building assembly,the light wood structure building system has been strongly supported by national policies,and its vibration comfort performance has also received widespread attention.As a new type of light wood structure building,the fabricated structural insulation board building has a more slab vibration response than other floor systems,but lacks corresponding experimental research and theoretical analysis,and there are no relevant codes and standards in China that can accurately evaluate its vibration.Comfort performance.Therefore,this paper studies the vibration comfort performance of prefabricated structural insulation board floors through experiments and finite element analysis methods to provide a basis for engineering applications.The research results will promote the application and promotion of prefabricated structural insulation board buildings in low-rise buildings.The main work and research results are as follows:(1)This article carried out subjective evaluation and vibration comfort test research on the vibration comfort of five full-scale prefabricated structural insulation board floors and two full-scale light-weight wooden structure floors.The results show that:a.The self-vibration frequency has little effect:under the three conditions of environmental excitation,hammer excitation or heel excitation,the first-order natural frequency of the slab measured by the modal test is basically the same;b.Whether there is a fixed live load on the natural frequency of the slab Large influence:the first-order natural frequency of the floor slab in the bare board state without external live load is 50%-152.63%higher than the first-order natural frequency of the floor slab with 1.0k N/m~2 uniformly distributed load;c.Spline type And spline height have a certain effect on the vibration comfort performance of the floor:when the type of spline is unchanged,increasing the height of the spline(or joist)can increase the natural frequency of the floor,reduce the deflection and peak acceleration of the floor;When the height of the spline is constant,the floor slab with the veneer laminate as the connecting spline has the best vibration performance,followed by the standard material spline,and the heat insulation spline is the worst;d.The walking route has little effect on the floor acceleration response and the self-weight has a certain effect on the response of the floor acceleration:as the person’s own weight increases,the peak acceleration of the floor increases.(2)The article uses ANSYS finite element software to model and simulate the test specimens S2-S5,and compares with the test results to verify the rationality of the finite element model and the correctness of the simulation method.On this basis,explore the influence of spline height,floor span and boundary conditions on the vibration performance of floor insulation panels of fabricated structures.The results show that:a.The effect of increased spline height and boundary condition reinforcement on comfort performance is positive,while the increase in floor span is reversed;b.Comparing the existing vibration comfort evaluation standards abroad,when the span is greater than When the height of 4880mm or the spline is less than 235mm,the vibration comfort performance of the structure form floor cannot fully meet the requirements.If this structure form floor is promoted in the future,the combination effect and rigidity of the floor form should be strengthened,and pay close attention to whether the comfort performance meets the requirements;c.It is recommended to take the mid-span deflection no greater than 2mm,the natural frequency of the bare board state greater than 15Hz,and the natural frequency of the normal use state greater than 10Hz as the comprehensive evaluation standard for the comfort of the floor insulation of assembled structures. |
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