Determine

1) The horizontal thrust

2) The moment,radial shear and normal thrust at a section 6m from the left hand support

3) Draw B.M.D

Note: Since the arch is symmetrical h=10m

1) $Rx^n$ and horizontal thrust

$\sum M_A = 0 (\circlearrowleft+ve)$

$45 \times 10 \times \frac{10}{2} - V_B \times 20 = 0$

$\boxed{V_B = 112.5 KN}$

$\sum F_y = 0 (\uparrow +ve)$

$V_A - 45 \times 10 + 112.5 = 0$

$\boxed{V-A = 337.5 …