超高烟囱顺风向风振系数研究

Study on wind vibration coefficient of ultra-high chimneys

对210 m、240 m、270 m和300 m 4种高度的烟囱分别进行风洞试验,得到了A、B两类地面粗糙度情况下烟囱不同高度处的风振系数。通过与现行荷载规范对比,证明了就顺风向风振系数而言,采用荷载规范计算烟囱的顺风向风荷载是安全的。同时,根据最小二乘法原理,得到了风振系数关于k和a_(1)的三维坐标关系图,求得了试验值与规范值偏差平方和最小值所对应的k和a_(1),提出了不同地面粗糙度情况下k和a1的推荐值。

In this paper,the wind tunnel experiment is carried out on the chimneys at four heights of 210 m,240 m,270 m and 300 m respectively,and the wind vibration coefficients at different heights of the chimneys under the conditions of two types of ground roughness A and B,are obtained.By comparing the current load codes,it is proved that it is safe to calculate the downwind wind load of the chimney with the load code in terms of the wind vibration coefficient.At the same time,according to the principle of least square method,the three-dimensional coordinate diagram of wind vibration coefficient about k and a_(1)is obtained.The recommended values of k and a_(1)under different kinds of ground roughness are proposed.