Stability  Stable & Unstable Structures & Members 

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DefinitionThe resistance offered by a structure to undesirable movement like sliding, collapsing and over turning etc is called stability.
STABLE STRUCTURESA stricter is said to be stable if it can resist the applied load without moving OR A structure is said to be stable if it has sufficient number of reactions to resist the load without moving. UNSTABLE STRUCTUREA structure which has not sufficient number of reactions to resists the load without moving is called unstable structures. 
Stability of StructuresSTABILITY OF TRUSSA truss is said to be stable if it is externally and internally stable EXTERNAL STABILITY OF TRUSS:Externally a truss is said to be stable if
INTERNAL STABILITY OF TRUSS:Internal stability of truss depends upon the arrangements of members and joints as * If m + r = 2j internally stable Where m = number of members, J = number of joints, R = number of unknown reactions. For complete stability the should be both internally and externally stable Stability of Structural Members
A beam is said to be stable if it satisfy the following conditions.
STABILITY OF FRAMEA frame is said to be stable if it satisfy the following condition.
