Abstract
The wind pressure fluctuations on structures are very complicated because wind is disturbed by structures and wind itself changes its direction and velocity, so it is not easy to know their nature clearly. In order to get imformations of wind load on structures, it measured that wind pressure fluctuations on walls and roofs of an existing house, then from the test data the power spectra of wind pressure fluctuations are computed. The measurements are carried out against the seasonal wind at Shionomisaki Wind Effect Labolatory of Kyoto Univ. on Feb. 23rd and Mar. 17th in 1963. Refference wind velocity is 5 m/sec to 18 m/sec at the point 10 m high above the ground level. There is on open field on the windward side of the house. The results show that the power spectra on the windward walls are similar to that of refference wind having no peak value at any period of pressure fluctuations. On the other hand it will be noted that the peak values are observed in the case of those on roofs or eaves at the period of 0.2sec to 0.3sec, which shows that on roofs or eaves vortices break out periodically and that the pressure fluctuations there are affected mainly by the house form more than the turbulence of natural wind. The period of 0.2sec to 0.3sec at which the power spectra take peak values, is expected to be shorter when the refference wind speed becomes faster.
