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Bending moment co-efficients and shear co – efficients for continuous beams of uniform crosssection as per IS 456 (tab 12 and 13) may be used only when spans do not differ to the longest span by
- a)10%
- b)12%
- c)15%
- d)20%
Correct answer is option 'C'. Can you explain this answer?
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Bending moment co-efficients and shear co efficients for continuous b...
Explanation:
The bending moment co-efficients and shear co-efficients for continuous beams of uniform cross-section are given in tables 12 and 13 of IS 456. These tables are used to determine the maximum bending moment and shear force in a continuous beam with uniformly distributed load. However, these tables can only be used when the spans do not differ from the longest span by more than 15%.
If the spans differ from the longest span by more than 15%, there will be a significant difference in the bending moment and shear force distribution. The bending moment and shear co-efficients will be different for different spans, and using the values from the tables will result in inaccurate calculations.
Therefore, when designing a continuous beam with spans that differ from the longest span by more than 15%, the designer must calculate the bending moment and shear force distribution for each span using the appropriate equations. The designer must also consider other factors such as the type of loading, the support conditions, and the beam's geometry.
In summary, the bending moment co-efficients and shear co-efficients for continuous beams of uniform cross-section as per IS 456 (tab 12 and 13) may be used only when spans do not differ from the longest span by more than 15%.
The bending moment co-efficients and shear co-efficients for continuous beams of uniform cross-section are given in tables 12 and 13 of IS 456. These tables are used to determine the maximum bending moment and shear force in a continuous beam with uniformly distributed load. However, these tables can only be used when the spans do not differ from the longest span by more than 15%.
If the spans differ from the longest span by more than 15%, there will be a significant difference in the bending moment and shear force distribution. The bending moment and shear co-efficients will be different for different spans, and using the values from the tables will result in inaccurate calculations.
Therefore, when designing a continuous beam with spans that differ from the longest span by more than 15%, the designer must calculate the bending moment and shear force distribution for each span using the appropriate equations. The designer must also consider other factors such as the type of loading, the support conditions, and the beam's geometry.
In summary, the bending moment co-efficients and shear co-efficients for continuous beams of uniform cross-section as per IS 456 (tab 12 and 13) may be used only when spans do not differ from the longest span by more than 15%.
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