APPLICATION OF POD TO PREDICTION OF WIND PRESSURE FIELDS OF PITCHED ROOF

The random wind pressure field of a pitched roof is predicted in terms of the proper orthogonal decomposition (POD) technique. With the wind pressure data which are measured simultaneously in a wind tunnel test, two schemes are adopted to predict wind pressure time series on the locations of a roof where the pressure taps are not distributed. The statistics, such as the mean value, root mean square value, peak value, and auto-spectra of the predicted data have been compared with those of the measured data. It is found that the mean value and r.m.s value of the predicted wind pressure time series are reasonably accurate. Most of the predicted wind pressure peak values are somewhat underestimated, however, the auto-spectra of predicted data are consistent with those of the measured data at the low frequency range. This leads to the feasibility of employing the predicted results in the wind-induced dynamic response analysis.