摘要
通过风洞试验研究了具复杂截面的连体双塔高层建筑的风荷载特性,并进行了单塔试验比较.将风压沿截面进行积分求出沿坐标轴方向的合力,然后反算为沿坐标轴方向的整体体型系数.结果表明:风压沿高度变化不大,整体体型系数沿高度递减;单塔最大体型系数对应的风向角偏离坐标轴15°;就双塔连线方向(x向)体型系数而言,上游塔略小于单塔情形,下游塔小于单塔的50%,垂直双塔连线方向(y向)体型系数略小于单塔y向,连体部分的y向体型系数约为2.0,x向为零.分析认为:上游塔对下游塔的遮挡作用使下游塔整体体型系数减小,下游塔降低了上游塔尾流的速度和背面负压,也使上游塔整体体型系数略为减小;但是由于尾流的复杂化,上下游塔局部风压比单塔有所增大.综合分析试验结果,文中最后提出了类似工程的风荷载取值建议.
In this paper, first, a wind tunnel test was carried out to investigate the characteristics of wind load on the surface of a twin-tower corridor-connected tall building with complex geometric plan. Next, a single-tower test was performed for comparison. Then, the total wind force along the coordinate axis was calculated by integrating the wind pressure along the plan circumference. The results were finally inversly calculated to obtain the global shape coefficient. It is found that the wind pressure slightly increases with the elevation and the global shape coefficient continuously decreases, that the wind angle of single tower corresponding to the maximum shape coefficient is 15 away from the coordinate axis, that the x-direction shape coefficient of the upstream tower in the twin towers is slightly less than that of the single tower and that of the downstream tower is 50% less than that of the single tower, that the y-direction shape coefficient is slightly less than that of the single tower, and that the shape coefficient of space corridor is about 2. 0 in y direction and zero in x direction. The analyses demonstrate that the block of wind by the upstream tower may decrease the global shape coefficient of the downstream tower and the downstream tower may slow down the wake flow and decrease the negative pressure on the back of the upstream tower, thus slightly redu- cing the corresponding shape coefficient. However, the local wind pressures of the upstream and the downstream towers both increase due to the complicated wake flow. The authors also present some design values of wind load for similar projects based on the analyzed and tested results.
出处
《华南理工大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2008年第3期121-127,共7页
Journal of South China University of Technology(Natural Science Edition)
基金
广州市建设科技发展基金资助项目(2006-25)
关键词
风洞试验
风压系数
体型系数
高层建筑
双塔连体结构
wind tunnel test
wind-pressure coefficient
shape coefficient
tall building
twin-tower corridor-con-nected structure
