For a prismatic beam member with the far end fixed, the rotational stiffness at the near end is
Correct answer: C. 4EI/L
- A. 2EI/L
- B. 3EI/L
- C. 4EI/L
- D. 6EI/L
Explanation
When the far end is fixed, rotation at the near end produces an end moment of 4EIθ/L, so the near-end rotational stiffness is 4EI/L. The value 3EI/L applies when the far end is hinged, which is the common trap.
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