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Stability of Equilibrium States
This lecture covers the stability of equilibrium states in structural mechanics, focusing on internal loads in a truss, the principle of superposition, and the criterion for stability. The instructor explains cases where the principle of superposition cannot be applied and discusses the conditions for equilibrium states. The lecture delves into the virtual work of external loads, arbitrary virtual displacements, and rotations to determine equilibrium. Various kinematic quantities and their relationships are explored to analyze equilibrium conditions. The lecture concludes with examples illustrating internal loads in a truss and the kinematic relations involved.
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