Civil Engineering MCQJE Level Civil Engineering
In a three-hinged arch, the horizontal thrust H at the supports when loaded by a central point load W on span L is:
Strength of MaterialsStrength of MaterialsMEDIUM
Choose the correct answer
A
H = WL/(2h)
B
H = WL/(4h)
C
H = Wh/L
D
H = W/4
Correct Answer
B. H = WL/(4h)
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Three-hinged arch with central point load W, span L, rise h: H = WL/(4h) by taking moments about the crown hinge (where bending moment = 0). The thrust H reduces bending moments in the arch compared to a straight beam. For a parabolic arch with UDL: H = wL²/(8h) (all bending eliminated in the arch).
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