Analysis Of The Wind-induced Vibration Response Of Beam String Structure

The long-span spatial structure has developed rapidly in the past ten years in our country, shapes of long-span spatial structures are assorted, for example, grid structure and shell structure, suspending cable structure, membrane structure, tensegrity system, hybrid structure and so on, thereinto, the beam string structure (BSS) as a tense long-span spatial structure, because of many advantages of itself, more and more importance has been attached to it in the latest years. As for the long-span spatial structure, because wind load is the decisive load in the most of case, the study of influence of wind load on this kind of structure is significant. The integral stiffness of this structure is small, which lead the structure sensitive to wind load, so the analysis of wind-induced vibration response of this structure can't adopt the static analysis which is stipulated in the Code, it is an urgent need of proposing a kind of wind response analysis method suited for it.Firstly, the time domain method based on the application of linear filters to sequences of random numbers is used, take a plane BSS for example, the time domain analysis of it is done, further, with four fundamental parameters (dead load of roof, prestress, span and rise) changed respectively, the influence of the four parameters on wind-induced vibration response is analyzed. A two-direction BSS is analyzed in the same way, pay attention to the change of wind-induced vibration response of every plane BBS, compared with the plane BBS above. Secondly, the method of frequency domain analysis is used, the plane BSS above is analyzed, pay attention to the influence of the number of compounding modes on results. Lastly, the favorable characteristic of the localization of time and frequency and the variable focus of the wavelet transform is used, as for the point of small content of low frequency of the wind time speed series which is simulated by the method of time domain analysis, haar wavelet function is used to decompose the series above, then the content of low frequency is amended.By analysis of this paper, the time domain method which is used here is an effective method to solve the problem of the wind-induced vibration response of BBS, the influence of the four parameters analyzed on the wind-induced vibration response are all small. The wind-induced vibration response of two-direction BSS is more even than that of plane BSS, and the wind-induced vibration coefficient of two-direction BSS is smaller. The result of frequency domain analysis is larger, the influence of the number of compounding modes on precision of results is large. After being recomposed, the series is more accurate.