关键词: 风效应, 风环境, 风压分布, 风载体型系数, 风洞试验, 世博轴

Abstract:

In order to deeply investigate the wind pressure distribution and wind vibration characteristics of complex cable-membrane roof in real environment,a two-year wind effect monitoring of the Expo Axis was carried out. By analyzing the data recorded in a strong wind process in July,2011,the wind environment and wind pressure distribution of the roof were obtained and compared with those obtained by wind tunnel test. Analytical results indicate that ( 1) negative wind pressure predominates at the wind inflow side of the roof of the Expo Axis,while positive wind pressure predominates at the other side; ( 2) the pulse wind pressure on the edge of the wind inflow side is high,while that at the other side is relatively low; ( 3) both the average and the pulse wind pressure coefficients decrease with the roof height; ( 4) the average wind pressure coefficient is basically insensitive to the wind speed; and ( 5) though the wind pressure coefficient measured in real environment is less than that measured by wind tunnel test,they both possess similar distribution trend.

Key words: wind effect, wind environment, wind pressure distribution, wind-load shape coefficient, wind tunnel test, Expo Axis