A parabolic two hinged arch is loaded with a concentrated load 'W' at the crown. The horizontal thrust is equal to
Where 'L' is the span and 'h' is the rise.
1
\(\rm\frac{54}{128} \frac{WL}{h}\)
2
\(\rm\frac{25}{128} \frac{WL}{h}\)
3
\(\rm\frac{50}{128} \frac{WL}{h}\)
4
\(\rm\frac{36}{128} \frac{WL}{h}\)