Machine Design
Slenderness ratio is the ratio of

Maximum size of column to minimum size of column
Width of column to depth of column
Effective length of column to width of column
Effective length of column to least radius of gyration of the column

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Machine Design
For unequal width of butt straps, the thicknesses of butt straps are

0.625 t for both the straps on the inside and outside
0.75 t for both the straps on the inside and outside
0.75 t for wide strap on the inside and 0.625 t for narrow strap on the outside
0.75 t for narrow strap on the inside and 0.625 t for wide strap on the outside

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