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2. Euler's critical load - Wikipedia

   en.wikipedia.org/wiki/Euler's_critical_load

   In practical design, it is recommended to increase the factors as shown above. The following assumptions are made while deriving Euler's formula: [3] The material of the column is homogeneous and isotropic. The compressive load on the column is axial only. The column is free from initial stress. The weight of the column is neglected.

3. Reinforced concrete column - Wikipedia

   en.wikipedia.org/wiki/Reinforced_Concrete_Column

   A reinforced concrete column is a structural member designed to carry compressive loads, composed of concrete with an embedded steel frame to provide reinforcement. For design purposes, the columns are separated into two categories: short columns and slender columns.

4. Slenderness ratio - Wikipedia

   en.wikipedia.org/wiki/Slenderness_ratio

   111 West 57th Street in Midtown Manhattan is the world's most slender skyscraper. In architecture, the slenderness ratio, or simply slenderness, is an aspect ratio, the quotient between the height and the width of a building. In structural engineering, slenderness is used to calculate the propensity of a column to buckle.

5. Buckling - Wikipedia

   en.wikipedia.org/wiki/Buckling

   A short steel column is one whose slenderness ratio does not exceed 50; an intermediate length steel column has a slenderness ratio ranging from about 50 to 200, and its behavior is dominated by the strength limit of the material, while a long steel column may be assumed to have a slenderness ratio greater than 200 and its behavior is dominated ...

6. Johnson's parabolic formula - Wikipedia

   en.wikipedia.org/wiki/Johnson's_parabolic_formula

   The slenderness ratio is an indicator of the specimen's resistance to bending and buckling, due to its length and cross section. If the slenderness ratio is less than the critical slenderness ratio, the column is considered to be a short column. In these cases, the Johnson parabola is more applicable than the Euler formula. [5]

7. Classical order - Wikipedia

   en.wikipedia.org/wiki/Classical_order

   The shaft is wider at the bottom than at the top, because its entasis, beginning a third of the way up, imperceptibly makes the column slightly more slender at the top, although some Doric columns, especially early Greek ones, are visibly "flared", with straight profiles that narrow going up the shaft. The capital rests on the shaft.

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9. Perry–Robertson formula - Wikipedia

   en.wikipedia.org/wiki/Perry–Robertson_formula

   The Perry–Robertson formula is a mathematical formula which is able to produce a good approximation of buckling loads in long slender columns or struts, and is the basis for the buckling formulation adopted in EN 1993. The formula in question can be expressed in the following form: