Theory of Structures
At yield point of a test piece, the material

Behaves in an elastic manner
Undergoes plastic deformation
Regains its original shape on removal of the load
Obeys Hooke’s law

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Theory of Structures
Slenderness ratio of a long column, is

Area of cross-section divided by radius of gyration
Area of cross-section divided by least radius of gyration
Radius of gyration divided by area of cross-section
Length of column divided by least radius of gyration

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