A structure is internally unstable when it can undergo
Correct answer: C. A deformation without developing sufficient restoring resistance
- A. A support reaction satisfying equilibrium equations
- B. A small elastic deformation under a service load
- C. A deformation without developing sufficient restoring resistance
- D. A temperature strain in an unrestrained member
Explanation
Internal instability occurs when the arrangement of members permits a mechanism or uncontrolled deformation without adequate resisting forces. Such a structure may satisfy some equilibrium equations while still lacking the stiffness needed to retain its shape.
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About Structural Analysis
Structural analysis determines how beams, frames, trusses and arches carry loads through reactions, shear forces, bending moments, axial forces and deflections. It covers free-body diagrams, equilibrium equations, determinacy, influence lines and methods such as slope deflection, moment distribution and virtual work, while distinguishing analysis of a structure from its design.
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