Previous work by Shek and Bartlett (2008) has developed practical means to size steel cover plate reinforcement for steel wide-flange columns that are deficient according to current design codes. The present study investigates the use of partial-length cover plates at the mid-height of the column as a means to reduce cost. Typical columns have slenderness ratios that correspond to Euler- or inelastic-buckling failures: classical solutions for Euler buckling are available but inelastic buckling is not captured in current equations for partial-length built-up sections. A preliminary sensitivity analysis considering the thickness and length of steel reinforcing plate indicates that the reinforcing plate length can be significantly decreased, particularly for very slender columns, if its thickness is increased. Adding steel cover plates for only a partial length of the column allows for a reduction in material and labour costs to a near-optimum solution that is relatively insensitive to the assumed cost values. A preliminary design procedure is presented for sizing flange reinforcement plates for columns that fail by linear-elastic buckling.
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机译：Shek and Bartlett（2008）的先前工作已经开发出了实用的方法，可以根据当前的设计规范来确定用于钢制宽法兰柱的钢盖板加强筋的尺寸。本研究调查了在立柱中间高度使用部分长度的盖板作为降低成本的一种方法。典型的列具有对应于Euler屈曲或非弹性屈曲破坏的细长比：可获得Euler屈曲的经典解，但是在当前方程式中对于部分长度的组合截面没有捕捉非弹性屈曲。初步的灵敏度分析考虑了钢加强板的厚度和长度，表明如果增加其厚度，可以显着减少加强板的长度，特别是对于非常细长的柱子。仅在塔的一部分长度上增加钢质盖板，可以将材料和人工成本降低到对假设的成本值相对不敏感的接近最佳的解决方案。提出了初步设计程序，用于确定因线性弹性屈曲而失效的柱的法兰加强板的尺寸。
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