Wind load characteristics of crescent-shaped cantilevered roof with wavy surface

Wind tunnel tests were conducted on a crescent-shaped cantilevered roof with wavy surface to study the wind pressure characteristics of the structure. And computational fluid dynamics (CFD) analysis was carried out to research the influence of the wavy surface on the local wind pressure. Via statistic analysis of wind tunnel test results, the distribution rules of mean wind pressure, fluctuating wind pressure and extreme wind pressure and the correlation coefficients of wind pressures on upper and lower surfaces were obtained. The CFD simulation showed that the wind pressure of crest regions was obviously higher than that of valley regions nearby and also higher than that of smooth roof at corresponding regions. The rule obtained could be applied to common wavy cantilevered structures. The extreme wind pressure could be converted into gust factor used for building envelope design. Comparing with code, some suggestions on design of structures with similar shape were proposed. The effect of wavy surface and block on wind pressure correlation coefficients of upper and lower surfaces was analyzed. The result showed that wavy surface had little influence on the correlation, yet block of structure had significant influence on the correlation.