Wind tunnel test and sensitive wind speed study of large-span cable dome roof structure
The frequency of large-span cable dome structure is dense,and its wind vibration force response is complex.It is always popular in wind engineering to investigate the influence of the fluctuating wind response on the wind sensitivity of the large-span cable dome structure under different wind speeds.For the large-span cable dome roof structure,the test model with the scale ratio of 1∶250 was designed and 36 groups of wind tunnel pressure tests were carried out under Class B landform.The wind pressure peak distribution law and the typical adverse wind direction angles of the large-span cable dome roof structure under all wind direction angles were studied.Finally,based on the wind tunnel test data,the wind-induced vibration sensitivity of the cable dome roof under different wind speed levels was analysed.The results show that the cable dome roof mainly bears negative wind pressure.The roof mainly bears the Z-direction negative wind-induced displacement response,showing the law of decrease from the central area to the periphery.The Z-direction wind-induced displacement response of roof raised with the increase of wind speed,and the average wind response goes up linearly with the increase of wind speed.Under some levels of the wind speed,the fluctuating wind displacement response and the total extreme displacement response of cable dome are sensitive,and the wind vibration coefficient is large.The time history Fourier transform amplitude of the wind pressure coefficient at the maximum point of the structural roof response reaches the peak in the first 10 frequency bands of the structure,indicating that the cable dome roof structure has a sensitive range of the wind speed,and its fluctuating wind response is strong and closely relates to the structural modal natural vibration characteristics.It is necessary to find out the sensitive range of the wind speed and to focus more on the area with significant response while designing the wind resistance.
NETL
NSTL
万方数据
维普
