A three-hinged parabolic arch of span ‘l’ and rise ‘h’ is subjected to u.d.l. of intensity ‘ω’, then the horizontal thrust at the supports is
1
\(\frac{{\omega {l^2}}}{{8h}}\)
2
\(\frac{{\omega l}}{h}\)
3
\(\frac{{\omega l}}{{8{h^2}}}\)
4
\(\frac{{\omega hl}}{8}\)