摘要
锅炉钢烟囱属于高耸结构,风荷载计算在结构设计中起着关键作用。针对中美钢烟囱规范存在的差异,从基本风速、顺向风荷载计算和横向风振判断3方面进行了比较和分析;并以两个工程实例进行了风荷载计算结果比较。比较结果显示:两国规范的基本风速不能混用需进行换算,换算比值取1.45较为合理,按此比值计算得到的顺向风荷载基本一致;针对同一工程案例,两国规范判断横向风振结果可能会不同,结构风荷载设计值也会不同;为保证涉外项目的安全性,应使结构均满足两国规范相关要求。
Boiler steel-made smoke stacks pertain to high-rise structures and the wind load calculation plays a key role in structural design.In the light of the differences existing in American and Chinese specification for steel-made smoke stacks,the basic wind speed,along-the-wind-direction wind load calculation and lateral wind vibration were compared and analyzed.With two engineering projects serving as examples,their wind load calculation results were compared.It has been found that the basic wind speeds stipulated in the specifications of both countries cannot be used at a same time and a conversion is needed,and the conversion factor of 1.45 is considered as relatively sound and reasonable.The along-the-wind-direction wind load as calculated as per this conversion factor is basically identical to that as calculated as per the other specification.For a same engineering project,the lateral wind vibration results judged by using the specifications of both countries may be different and the wind load design value of the structure may also be not identical.To guarantee the safety of foreign-related projects,the structure should meet all relevant requirements stipulated in American and Chinese standards.
出处
《热能动力工程》
CAS
CSCD
北大核心
2014年第6期740-746,766,共7页
Journal of Engineering for Thermal Energy and Power
关键词
钢烟囱
风荷载
基本风速
横向风振
规范
steel-made smoke stack,wind load,basic wind speed,lateral wind vibration
