Large span roof structures have been widely adopted for their good performance in multiple functionalities and innovative designs. However, because of its light weighted feature, wind resistant design is more prior to the earthquake design. And further, its long span geometry often results in a weak spatial correlation in pressure distributions and hence makes the estimation of wind loads a difficult task. Spectrum characteristics of wind pressures have been mentioned in several publications; however, there is no systematic discussion in terms of basic parameters, such as the ratio of roof rise to roof span, the ratio of base wall height to roof span, or the location over the surface. In this paper, power spectra of fluctuating wind pressures on various dome-like roofs are investigated under a suburban terrain flow. By examining the mean and RMS pressure coefficients, basic flow patterns are demonstrated in terms of the rise/span and wall-height/span ratios. Then the general approximation model was proposed to simulate the variations of power spectra of fluctuating pressures over the dome-like roofs. By the weighting factor concept and based on reasonable assumptions, the general approximation model reproduced fairly good agreements in describing the overall tendencies and acceptable spectra at individual locations.
中國土木水利工程學刊=Journal of the Chinese Institute of Civil and Hydraulic Engineering 28(1), p.11-19