Fluctuating Wind Pressure Characteristics on Saddle Roof with and Without Enclosed Wall Under Different Terrain Conditions

Abstract:

The wind tunnel tests on rigid models of saddle-shape cable roofs with and without enclosed wall were carried out in exposure categories B and D. The distribution characteristics of the fluctuating wind pressures in the two wind fields and their relationships were investigated based on the wind pressure data obtained from the tests. Besides,the influences of the enclosed walls on fluctuating wind pressure distribution characteristics were also discussed in detail by comparing the power spectra and time series of wind pressures on the saddle roof model with and without the enclosed walls. The results indicate that the wind field category has significant effects on the fluctuating wind coefficients;the fluctuating wind distribution characteristics are similar to mean wind pressure distribution;the fluctuating wind pressure energy of saddle-shape cable roof with enclosed wall mainly distributes in the reduced frequency range lower than 0.3 Hz,but fluctuating wind pressure energy in high frequency range of saddle-shape cable roof without enclosed wall is higher than that of saddle-shape with enclosed wall.

Key words:saddle roof; wind tunnel test; fluctuating wind pressure; power spectra