Wind pressures on the post office tower, London

Full scale measurements were made of wind pressures on the 177m high post office tower, London. The variation of pressure with height was studied from recordings made at nine different levels between 49m and 168m above ground level. It is suggested that wind speeds of greater magnitude than those at the top of the tower sometimes occurred at lower levels. Cross-correlations were computed between pairs of pressure transducers, ranging in separation from 9 m to 119 m, to give information relating to the vertical spread of gusts on the tower. The variation of pr.essure around the tower was also investigated at four different levels. Comparisons are made with results from wind tunnel tests, and it is shown that reasonable agreement can be obtained.