Abstract
To know the wind load acting on highrise buildings, we made the full-scale measurement at the Building No.51 of Waseda University, which has rectangular plan. In this paper, we tried to grasp their quality and quantity of the wind pressures by face-on wind. On the windward face, we summarize them as follows. (1) Pressure fluctuates following to velocity pressure very closely. (2) Therefore, we can see that these frequency distribution fits rather well with that are led from eq. (8) than Gaussian and that the likeness of the distribution of mean, RMS and maximum instantaneous pressure coefficients. (3) At all points including the end area, the envelops of pressure fluctuations are similar. That leads to higher correlation of pressure fluctuation. (4) Nearing the central point, the component of smaller fluctuation, which consists in velocity pressure, disappears gradually. It results that the decay of power spectral density becomes steeper in high frequency region and that the transmitting ratio of turbulence becomes smaller. (5) At the end area, pressure includes small fluctuation generated there. Therefore power spectral density in high frequency region decays rather slowly. On the leeward face, (1) Pressure fluctuation hardly follows to wind velocity. (2) It seems pressure fluctuates actively when wind velocity is higher. According to that, RMS or maximum instantaneous pressure may relate almost linearly with mean or maximum instantaneous velocity pressure. (3) The similarlity in the pressure fluctuations of the central and the end area can hardly be recognized. Therefore the correlation of pressure fluctuation is lower. (4) Allover the leeward face, not only mean pressures are very small, but pressures fluctuate very moderately.
