摘要
对台风气候及龙卷风气候的风场特性进行了阐述,针对台风气候提出了包含台风风环境特性、表面风压特性及结构动力特性的等效静风荷载计算公式,并与规范定义的风荷载进行对比,研究表明:A类、B类场地下沿冷却塔高度方向台风气候引起的表面风荷载与规范值各有大小;龙卷风气候下冷却塔内、外表面均呈现较大吸力,龙卷风距离塔筒中心越近,内、外表面吸力越大;针对这两种常见的特异气候建议进行结构风效应和风致失稳的专项研究。
The features of wind fields under typhoons and tornadoes are described, the equivalent static wind loads under typhoon climates which consider wind environments, wind-induced pressures and structural dynamic characteristics of cooling towers are proposed, and compares the wind loads on large cooling towers under normal climates. The results show that the wind load distributions along the height directions in Terrain A and Terrian B fields under typhoon climates are significant different fromthose calculated by the code DLT/5339-2006. The external and internal pressures of cooling towers are all suctions and the suctions become larger when the cooling towers are closer the vortex core of tornado. Therefore, the individualized studies of wind-induced effects and wind-induced bucklings should be conducted.
出处
《电力勘测设计》
2017年第S1期276-284,共9页
Electric Power Survey & Design
