复杂截面超高层建筑风效应的风洞试验研究

Wind Tunnel Study of Wind Effects on Super-tall Buildings with Complex Section

通过对典型复杂截面超高层建筑开展的高频动态测力风洞试验,分析了超高结构风荷载及风致响应的作用机理。结果表明:周边干扰对该超高层建筑的整体风荷载有一定的影响,主要表现为“遮挡效应”。各风力脉动分量的相关性较低,风洞试验得到等效静力风荷载及风振系数与规范给定的相应结果差别明显,意味着对于此类建筑的风荷载只能通过风洞试验来确定。试验得到的结构顶部加速度满足我国规范给定的舒适度标准,结构自振频率及阻尼比对风振响应的计算结果影响较大。研究成果为超高层建筑的抗风安全设计提供了有用依据和资料。

The characteristics of wind-induced responses and wind loads on a super-tall building with complex section were investigated through the wind tunnel test by using high-frequency force balance technique.The experimental results reveal that the surrounding buildings produce certain shielding effects.The cross-correlations among various wind loading components are low.The equivalent static wind loads and wind-induced amplifier factors of the building are assessed based on the wind tunnel test results and show noticeable difference with those from the Chinese National Load Code and the Code recommended by the Architectural Institute of Japan.This implies that the wind loads on this super-tall building can only be obtained from wind tunnel test.Furthermore,the analytical results also indicate that the super-tall building would appear to satisfactorily meet the occupancy comfort criteria of the Chinese National Load Code.The natural frequencies and damping ratios of the structure has considerable influence on the wind-induced responses determined from wind tunnel test.The findings of the paper are expected to be of considerable interest and practical use to professionals and researchers involved in the wind-resistant design of super-tall buildings.