Barcarena电厂石膏库钢柱计算长度系数确定

Determining effective length factor of steel column for gypsum warehouse in Barcarena Power Plant

现行规范对标准的钢框架和门式钢架的计算长度系数均有相关规定,钢结构建筑物因功能需要在底层经常无法加设支撑,形成一种类似框架和门式钢架混合的结构形式,如果直接采用规范推荐的方法很难计算出此类非标准框架柱的计算长度系数.通过研究底层无柱间支撑钢框架柱的计算长度系数问题,确定了层与层之间的相互作用导致钢柱计算长度系数与规范不符的原因.结合算例用有限元法和规范法分别计算钢框架柱的计算长度系数,其结果满足设计精度要求.提出了针对此类非标准结构实用的解决方法.

There are technical specifications for standard steel frames and standard steel gabled frames. For the needing of functions, braces can＇t be settled in the bottom floor, so a mixed structure of normal frame and portal frame is shaped. Using the solution that nominated by code is difficult to get the length factor of column. This paper studies the column length factor of the inter-bottom column-free braced steel frame. Steel frame length is calculated with the finite element method and the standard method. The results meet the design requirement of accuracy. And then we figure out the cause that the interaction between layers leads to that steel column length factor is inconsistent with the specification; Finally, we propose a practical solution.