群体高层建筑的峰值风压分布特征  

Distribution characteristics of peak wind pressures on tall buildings

作　　者：朱剑波[1] 谢壮宁[1] 

机构地区：[1]华南理工大学亚热带建筑科学国家重点实验室,广东广州510641

出　　处：《建筑结构学报》2012年第1期18-26,共9页Journal of Building Structures

基　　金：国家自然科学基金重大研究计划重点项目(90715040);国家自然科学基金项目(51078146);亚热带建筑科学国家重点实验室自主研究课题项目(2008ZC20)

摘　　要：基于同步测压技术,研究了不同宽度比和不同高度比(记为Br和Hr,分别表示施扰和受扰建筑的宽度与高度之比)的2个高层建筑在串列、斜列和并列布置时峰值风压干扰效应。结果表明:邻近施扰建筑的侧面峰值风压主要呈现放大效应,且宽度比越大(Br≤1时),高度比越大,放大效应越明显,立面最高负风压系数绝对值可升高30%。迎风面放大效应区则主要集中在施扰建筑位于横风向间距为3b(b为受扰建筑的迎风宽度)的迎风区域内,立面最高正风压系数可升高40%。当串列间距较小且高度比小于1(Hr=0.8)时产生的三维绕流现象可使得受扰建筑侧面局部风压升高61%,迎风面边缘局部风压升高24%。并列布置时产生的峡谷效应引起足够的重视,试验测得最大干扰因子可达2.13且随并列间距的增大而减少,当并列间距超过9b时峡谷效应才渐趋消失。由试验结果回归得到的并列布置时的侧立面最大峰值风压干扰因子随并列间距变化的关系式具有较高可信度。Peak wind pressure on tall buildings under the interference of another tandem, staggered and side by side arranged building was studied using the synchronous wind pressure measurement technique. The effects of the breadth ratio（Br） and height ratio（Hr） were considered. The results show that the peak pressure of the lateral facade adjacent to the interfering building mainly causes amplification effect. With the Br（Br≤1）and Hr increased, the maximum peak wind pressure on the lateral face can be increased by 30%. When the interfering building is located in the windward area with the across-wind direction spacing less than 3b（b is the breadth of the interfered building）, the maximum peak wind pressure on the windward face can be increased by 40%. Due to the three-dimensional flow effects, lower upstream interfering building（Hr〈1） in tandem arrangement may make the local peak pressure on lateral and windward faces increase by 58% and 29% respectively. Channeling effect in side by side arrangement should be paid enough attention because maximum interference factor of the wind pressure on the lateral face is found to be 2.13 and decreases with the increase of the building spacing. The results show that only when the building spacing exceeds 9b do the channeling effects tend to disappear. A credible regression equation to predict the maximum interference factor of the peak wind pressure on the lateral face for two side by side arranged buildings is proposed.

关 键 词：高层建筑 风洞试验 峰值风压 干扰效应 峡谷效应 

分 类 号：TU973.213[建筑科学—结构工程] TU317.1