新型四管自立式钢烟囱的风荷载

Investigations of Wind Loads on a New Type of Self-Supporting Four Pipe Steel Chimney

为了解烟囱风荷载的分布特性,将风洞试验与理论分析相结合,对高240 m新型四管自立式钢烟囱的风荷载进行研究.采用大尺度刚性物理模型,在中国空气动力研究与发展中心低速空气动力研究所的8 m×6 m风洞工业试验段边界层流场中,完成大尺度刚性模型表面压力测量风洞试验.试验获得了结构风压及体型系数分布基本规律,依据我国规范的惯性风荷载法及国外的阵风荷载因子法,计算了等效风荷载及风振系数.结果表明,结构各柱体剖面压力系数沿高度分布规律近似,但柱体间相互干扰效应明显,在风向角为60°时,整体体型系数最大,最大值为0.663,顺风向等效风荷载与平均风荷载相当.

To reveal the wind load resistance characteristics of chimneys,wind tunnel testing and theoretical analysis were used to investigate the wind loads on a new type of self-supporting four-pipe steel chimney of 240 m height.With a large-scale rigid physical model,surface pressure measurement in a simulated atmospheric boundary layer flow field was made in the 8 m×6 m wind tunnel industrial test section at the China Aerodynamic Research and Development Center（CARDC）.The wind pressure distributions and the body coefficients of the structure were obtained,and the along-wind equivalent wind load and the wind-induced vibration coefficients were calculated by the conventional inertial wind loading method in the code of China and the gust loading factor method in the code of other countries.The results show that the pressure coefficient distribution on each section of pipes is approximately similar,but the interference effect between pipes is remarkable.The integral body coefficient reach a maximum value of 0.633 at the wind direction angle 60°.The response of the along-wind fluctuating equivalent wind load is close to that of the mean wind load.