Wind Tunnel Study Of Wind Load Characteristics On Long-span Spherical Shell Roof

Large span roof structures are widely used in various large public buildings in recent decades, such as hangars, gymnasiums and exhibition pavilions. But the large span roof structures have larger span, light weight, intensive vibration mode distribution, low frequency of a series of features, so this kind of structure is very sensitive to wind loads. While in case of damage under wind load is not uncommon,therefore, it is very important to study the wind resistant design of large span roof structures. This thesis is supported by National Natural Science Foundation.In this paper, wind tunnel test is used to study the surface wind load characteristics of a large span spherical reticulated shell roof, the main contents in this paper are shown as following:(1)The average wind pressure distribution, fluctuating wind pressure distribution and extremewind pressure distribution on the structure surface under different typical wind direction were analyzed and studied,which provided reference for wind pressure distribution on the surface of this kind of structure.(2)From the angle of the time domain of were analyzed by using peak over threshold methodon the surface of the ball shell roof pulse phenomenon,it is concluded that, in the windward area the pulse phenomenaof measuring points is obvious.Through the calculation of the three order and four order statistics, it is concluded that the method of the spherical shell roof is not divided into the Gauss region;Finally, the correlation between the measuring points is analyzed, which shows that the correlation decreases with the increase of the distance.(3)From the frequency domain, the power spectrum characteristics of the surface of the spherical shell roof is analyzed, and the maximum value of the spectrum is mostly in the low frequency band;At the same time, the coherence of the measured points isanalyzed, which shows that downwind is larger than cross correlation between wind measuring point, and the coherence of the measurement pointsdecreases with the increase of the distance and frequency.