A three hinged parabolic arch rib is acted upon by a single load at the left quarter point. If the central rise is increased and the shape of arch altered to segmental without changing the other details, the horizontal thrust will

- 1
  
  increase d efinitely
- 2
  
  decrease difinitely
- 3
  
  be difficult to predict
- 4
  
  increase or decrease depending upon the radius of the segmental arch

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