A three hinged parabolic arch rib of span $' L'$ and crown rise $' h ‵$ carries a uniformly distributed superimposed load of intensity $' w ‵$ per unit length. The hinges are located on two abutments at the same level and the third hinge at a quarter span location from left hand abutment. The horizontal thrust on the abutment is

- 1
  
  $w L^{2} / 4 h$
- 2
  
  $w L^{2} / 6 h$
- 3
  
  $w L^{2} / 8 h$
- 4
  
  $w L^{2} / 12 h$

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