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Q: If a truss is internally unstable, then we should use it when it is–
  • A. Statically determinate
  • B. Statically indeterminate
  • C. Statically determinate or statically indeterminate
  • D. We must never use it
Correct Answer: Option D - If m < 2j – 3 m → number of members. j → number of joints Then truss is said to be internally unstable truss. We should not use internally unstable trusses as they are liable to fail.
D. If m < 2j – 3 m → number of members. j → number of joints Then truss is said to be internally unstable truss. We should not use internally unstable trusses as they are liable to fail.

Explanations:

If m < 2j – 3 m → number of members. j → number of joints Then truss is said to be internally unstable truss. We should not use internally unstable trusses as they are liable to fail.