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Stability is the property of the structure to keep its initial position of equilibrium
Stability
The polar moment of inertia for а circle is:
The normal stress σ by bending is equal zero at center of cross-section of the beam
The deflection is measured from the original neutral surface to the neutral surface of the deformed beam
The moment of inertia of а rectangle about an axis x is:
The angle θ is defined as the deflection of the beam
For a given column the coefficient of lengthening
In the case of the off-center acting of longitudinal force, the stresses are determined from the dependence: