The above three conditions are commonly referred to as the equations of equilibrium for planar structures. The equilibrium requirements for structures in two and three dimensions are stated below.įor a structure subjected to a system of forces and couples which are lying in the xy plane to remain at rest, it must satisfy the following three equilibrium conditions: \( \newcommand\)Įquilibrium Structures, Support Reactions, Determinacy and Stability of Beams and FramesĮngineering structures must remain in equilibrium both externally and internally when subjected to a system of forces.
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