A three-hinged symmetrical parabolic arch of span 20 m and rise 5 m carries a uniformly distributed load of 2 kN/m for the whole span. The bending moment at quarter point is
A
zero
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B
75 kN-m (Sagging)
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C
100 kN-m (Sagging)
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D
75 kN-m (Hogging)
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Solution
The correct option is A zero The bending moment throughout the span will be zero for a three hinged parabolic arch subjected to uniformly distributed load.