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Structural Concrete - Hassoun

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CHAPTER12<br />

SLENDER COLUMNS<br />

Columns in a high-rise building.<br />

12.1 INTRODUCTION<br />

420<br />

In the analysis and design of short columns discussed in the previous two chapters, it was assumed<br />

that buckling, elastic shortening, and secondary moment due to lateral deflection had minimal effect<br />

on the ultimate strength of the column; thus, these factors were not included in the design procedure.<br />

However, when the column is long, these factors must be considered. The extra length will cause a<br />

reduction in the column strength that varies with the column effective height, width of the section,<br />

the slenderness ratio, and the column end conditions.<br />

A column with a high slenderness ratio will have a considerable reduction in strength, whereas<br />

a low slenderness ratio means that the column is relatively short and the reduction in strength may

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