The horizontal thrust (T) on the tie rods provided at the end beams of jack arch is given by

[ W= Live and dead load per metre length of the arch, L= Span of the arch, and R= Rise of the arch]

- 1
  
  $T = \frac{W L}{2 R}$
- 2
  
  $T = \frac{W L}{4 R}$
- 3
  
  $T = \frac{W L}{6 R}$
- 4
  
  $T = \frac{W L}{8 R}$

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