A three hinged parabolic arch rib with hinges at abutments and at crown is under the action of uniformly distributed load

$' W ‵$ per unit length over its entire span $' L ‵$ through its crown. The bending moment at quarter span is

- 1
  
  zero
- 2
  
  $W L^{2} / 8$
- 3
  
  $W L^{2} / 12$
- 4
  
  $W L^{2} / 24$

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