The Wind Performance Research Of The Large Span Beam String Structure

Beam string structure(BSS) is a kind of new long-span spatial structure, which has been developed in the past few years. This kind of structure system demonstrates stronger non-linear performance while receiving strength, its structural design is generally controlled by stability but not intensity, and have stronger defect sensitivenesses. At present, have already made considerable progress to the research of non-linear quiet strength performance of the beam string structure, but in the stability direction of dynamic,especially in the non-linear wind-resistant analyse remain to study further. As to space structure of large span, the wind loads function is the mainly structural design load, in case of great majority, it seems more important than the earthquake load.This text has carried on the job of the following several respect mainly on the basis of summarizing the wind-resistant performance and studying current situation of the beam string structure:(1) The subject is mainly through studing pieces of beam string structure strength performance and construct characteristic, utilize the artificial function of the finite element software ANSYS, has carried on parameter programming to the model of the beam string structure, calculation, establish the foundation of the dynamic responses of further investigating this structure reacts and analyses.(2) Utilize initial model, use finite element software ANSYS make mode analyse, systematic analysis the free vibration characteristics of beam string structure,for discuss the wind-resistant performance act as down foreshadowing thoroughly.(3) Describe the wind-induced dynamic response, summarize, find out the optimum analytical method.(4) Carry on equivalent static wind load analysis,draw structure respond including great displacement, the max pole axial force, the max cable strength and mini cable strength (avoid cable asking for relaxing),Compare the result to the result of the turbulent wind.(5) Utilize the autogressive-type simulation process and MATLAB program to simulat the turbulent wind loads,turnning into the wind pressure;then,transient analysis of beam string structure is done by performing ANSYS.(6) Utilize the frequency domain method and transient method to analysis the wind-induced dynamic response, and carry on the contrast to these two kinds of method analysis results. In addition, discuss the influence of the cable section,roofing Load permanently, the string prestress to the beam string structure. Finally,summarize the wind-induced vibration analysis, draw wind-induced vibration coefficient,including displacement responds coefficient and internal force coefficient, carry on the regular summary. Put forward some wind-resistant designs principle and substantive suggestion of the beam string structure.