On Wind Dynamic Characteristics Of Inflatable Membrane Structures Considering Fluid-solid Coupling

In recent years,more and more inflatable membrane structure were built,also appeared in the sports venues,exhibition halls,warehousing and other fields.Because of its softness,the obvious deformation and vibration of the membrane are affected by the wind load,and the change of the structure will in turn affect the size and distribution of the flow field around the structure,resulting in fluid-solid coupling effect.In some cases,the fluid-solid coupling effect will lead to structural damage,so with the wind load on,the dynamic mechanism of the membrane structure has been the subject of concern to scholars.In this paper,the relationship between the dynamic response characteristics of the cable-stiffened inflatable membrane structure and the pulsating wind field is obtained by discussing the variation rules of the internal pressure,film thickness,vector height and span.The basic principle of the action,between the membrane structure and the flow field is discussed.and through the stress and displacement equivalent principle,getting changed range of the wind vibration coefficient of the structural,which provides the basis for the structural engineering wind resistance design.In this paper,the pulsating wind load is obtained by the AR method,and the fluent interface program is compiled to introduce the pulsating wind load time history data into the wind field.Based on the weakly coupled partitioning strategy,the wind load response analysis of the full-scale structure in the workbench is carried out.By comparing the previous literature results and the simulation results,discovered the law in distribution of the wind pressure coefficients of the pulsating wind load in the cylindrical air,verifying the correctness of turbulence simulation.Then the self-made command flow of inflatable membrane structure is used to find the structural form consistent with the engineering practice,and the static calculation of the structure is realized by the workbench component.The self-vibration frequency and mode of the inflatable membrane structure were studied by establishing the structural model of cable-filled membrane with different film thickness,internal pressure,vector height and span.Learned the effects of different characteristics of the cable-stiffened inflatable membrane structure.Then,the analysis model of the structure of the inflatable membrane is established in the workbench of the numerical simulation platform.The dynamic response of the inflatable membrane structure under the pulsating wind field is calculated.The response time and spatial distribution of the pulsating wind field under the coupling effect are discussed.And the variation law of the load response of the inflatable membrane structure under the common membrane thickness,internal pressure,vector height and span is systematically studied.Finally,considering the flow-solid coupling,the cable-inflated membrane model with 1/4 and 1/3 of the span ratio is established.By calculating the load response of the structure under different wind speeds,received the variation range of the displacement wind vibration coefficient and internal force wind vibration coefficient,and define the wind vibration coefficient of the structure,which has very important engineering significance.