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Q: Three moment equation is applicable when
  • A. the beam is prismatic
  • B. there is no settlement of support
  • C. there is no discontinuity within. the span
  • D. the spans are equal
Correct Answer: Option C - Three moment method is a method suitable for analyzing continuous beam. This method is applicable– 1. To any type of cross-section not limited to prismatic cross-section. 2. In case of support settlement. Only extra moments generated due to support settlement is incorporated into the three moment equation. 3. If there is no discontinuity within the span cannot produce a valid M/EF diagram for the span. 4. For different span length, not necessarily the spans should be equal.
C. Three moment method is a method suitable for analyzing continuous beam. This method is applicable– 1. To any type of cross-section not limited to prismatic cross-section. 2. In case of support settlement. Only extra moments generated due to support settlement is incorporated into the three moment equation. 3. If there is no discontinuity within the span cannot produce a valid M/EF diagram for the span. 4. For different span length, not necessarily the spans should be equal.

Explanations:

Three moment method is a method suitable for analyzing continuous beam. This method is applicable– 1. To any type of cross-section not limited to prismatic cross-section. 2. In case of support settlement. Only extra moments generated due to support settlement is incorporated into the three moment equation. 3. If there is no discontinuity within the span cannot produce a valid M/EF diagram for the span. 4. For different span length, not necessarily the spans should be equal.