Analysis Of Wind Load On A Structure Based On Air Compressibility

Large span space structure as a kind of novel structure form,in the structure analysis and design calculation has many characteristics different from the traditional structure,in which the wind load is considered the most prominent,and in the design of this kind of structure analysis and calculation process,wind load often is the key and difficult points one of the problems.Is to determine the trace to its source,correlation coefficient and wind load of the basic calculation and analysis of wind load shape coefficient,for example,the wind pressure height coefficient etc.But according to the building structure load current design specifications on wind load coefficients are determined,the basic use of the assumption of incompressible air,this assumption can reduce the mathematical processing difficulty,can not reflect the structure of the wind loads of the real state of.Therefore,this paper in the air of the compressible and incompressible two characteristics under wind load on a structure is analyzed,combined with theoretical formula derived the theoretical solution,in order to get the depth of application Combined with the concrete analysis model,combined with the theoretical results discussed,conclusions are as follows:in the incompressible assumption,the structure surface pressure value and flow length and vibration acceleration is proportional to the flow field structure of the surface force is equivalent to the added mass;and in the case of compressed air,pressure and vibration velocity ratio,independent the flow field and flow field on the surface of structure length,equivalent viscous damping force.Finally,the theoretical solution is verified by numerical method.