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10 Cards in this Set
- Front
- Back
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Internally stable |
A structure is considered internally stable or rigid if it maintains its shape and remains in rigid body when detached from the supports. |
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Internally unstable |
A structure is considered internally unstable or non rigid if it cannot maintain its shape and may undergo large displacements under small disturbances when not supported externally. |
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Rigid Structures |
A structure that offers significant resistance to its change of shape. |
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Nonrigid structures |
A structure that offers negligible resistance to its change of shape when detached from the supports and would often collapse under its own weight when not supported externally. |
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Statically determinate structures |
An internally stable structure can be considered to be statically determinate externally if all its support reactions can be determined by solving the three static equations of equilibrium. |
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Statically Indeterminate structures |
If a structure is supported by more than three reactions, then all reactions cannot be determined from the three static equations, such structures are termed as statically indeterminate externally. |
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External redundants |
The excess reactions of those necessary for equilibrium. |
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Degree of External Determinacy |
This is the number of external redundants. For example, the structure has r reactions, then r-3n is the degree of indeterminacy. |
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