高层建筑风响应及等效静态风荷载的研究

Study of Wind Response of High-rises and Their Equivalent Static Wind Load

从悬臂梁振动理论出发,讨论了高层建筑风响应的计算以及在风洞中利用高频天平测量高层建筑风荷载的原理,并进一步分析讨论了沿建筑物高度分布的平均风力、脉动风力、风致振动惯性力以及建筑结构设计所需要的等效静态风荷载的确定问题,指出了所提方法的局限性和应用范围,可为高层建筑结构设计中的风荷载确定提供参考.分析结果表明,求沿高层建筑高度分布的等效静态风荷载的方法适用于顺风向风力,在应用于横风向风力时由于涡脱落力的影响有理论误差.

This paper discusses the computation of wind response of high-rises based on the vibration theory of cantilever beam and the principle of measuring their wind load in a wind tunnel using a high frequency balance.It further analyzes the height distributions of the mean wind force, fluctuating wind force, wind induced vibrating inertial force, and the determination of the equivalent static wind load required by the structural design of the buildings.This method can be used as a reference for determining the wind load of high-rises in their structural design.The result points out that the method of equivalent static wind load calculation in this paper is suitable for the along-wind wind force but exists theoretical error to across-wind wind force due to the influence of vortex shedding.