Study On Dynamic Characteristics And Wind Vibration Coefficient Of Cable-Stiffened Truncated Ellipsoid Membrane Structure

In recent years,applications of laser-stiffened aerated membrane structures are getting popular.We can see they are applied to sports venues,exhibition halls,warehouses and other fields.Due to the flexibility of the air filled film structure,the film surface under the wind load will be changed easily in shape.Consequently,the changes of the structure will affect the size and distribution of the surrounding flow field,which we call fluid-structure interaction.In some cases,this effect can lead to structural damage.Therefore,it is necessary to study the dynamic response of the cable-stiffened membrane structure under wind load.This paper is concerned with the relationship between the dynamic response characteristics of the cable-stiffened membrane structure and the fluctuating wind field by changing the parameters such as internal pressure,membrane material thickness,structure height and so on.The research includes the basic principle of the interaction between the cable-stiffened membrane and the flow field and the wind vibration coefficient of the cable-stiffened truncated ellipsoid membrane structure with different wind direction.The main content and work of this paper are as follows:Firstly,the autoregressive analysis method in MATLAB was used to simulate the fluctuating wind load.By compiling fluent interface program,the data of the fluctuating wind load was imported into fluent environment.Then,based on the method of weakly coupled partitioning strategy,the numerical wind tunnel simulation of fluctuating wind with fluid-structure interaction was carried out by using workbench17.0.The results are compared with the experimental data to verify the correctness of the turbulence simulation.Secondly,the shape finding analysis command flow of the inflatable membrane structure was compiled to make the model conform to the structure shape of actual engineering.Self-vibration characteristics of the structure were analyzed through the prestressed module component in workbench17.0.Then by changing the related parameters such as film thickness,internal pressure and vector height,and calculating the natural vibration frequency of the cable-stiffened infletable membrane structure model and analyzing its mode,the change law of the natural vibration characteristics of the film structure with the film thickness,internal pressure,height and span can be made.Finally,through numerical simulation platform,the cable-stiffened inflatable membrane structure analysis model is established in Workbench17.0,simulating the structure subjected to fluctuating wind dynamic response.How the wind Angle change of coupling effect of fluctuating wind field affects the surface of the cable-stiffened inflatable membrane structure of wind pressure distribution and the influence of structure deformation is mainly dealt with in this research.According to the displacement time history of fluctuating wind under the action of the statistic results,the value of displacement wind-vibration coefficient under the action of pulsating wind at different wind directions is calculated respectively,which provides references for inflatable membrane design in related engineering field.