In a parabolic three-hinged arch of span L and central rise h carrying UDL over entire span, horizontal thrust (H) at supports is:
Aw * L^2 / (8 * h)
Bw * L^2 / (4 * h)
Cw * L / (8 * h)
Dw * L^2 / (16 * h)
Explanation
Taking moment about crown hinge C gives H = w * L^2 / (8 * h).

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