A case study of wind pressure and wind-induced vibration of a large span open-type roof

Abstract

This paper reports on the results of wind tunnel tests and response analyses, both of which were conducted in order to obtain data for the wind resistant design of a large span roof. This roof is planned to be constructed in Kariya Japan. The study was composed of three parts. First, a wind tunnel test was carried out to investigate the characteristics of the wind force acting on the roof. Secondly, the response of the roof was estimated through the modeling of aerodynamic characteristics obtained from the wind tunnel test. Finally, a wind tunnel test, using an elastic model of the roof, was conducted and the test results were compared with the results of the response analysis. This paper only shows the results of the wind direction where the vibration response is found to be very large. In this case, small values of 0.1 ∼ 0.3 are shown for the mean wind pressure coefficient. however, the fluctuating wind pressure coefficients were found to be 0.2 ∼ 0.5, fairly large values. The power spectral density for the fluctuating wind force shows almost the same shape regardless of the location on the roof surface. With respect to the fluctuating wind pressure, the pressure fluctuation on the upper surface is larger in the high frequency area. However, in the low frequency area, the pressure fluctuation on the lower surface is larger. The fluctuation of the wind force acting on the roof shows an intermediate value for both surfaces. Furthermore, when the results of the response analysis and the vibration test are compared, it is found that both results correspond quite well to each other, and that aerodynamic negative damping do not act on the roof.