Civil Engineering MCQAE Level Civil Engineering
A three-hinged arch of span L and rise h carries a concentrated load W at the crown (midspan). The horizontal thrust at each springing is:
Structural AnalysisThree-hinged Arch Crown LoadMEDIUM
Choose the correct answer
A
WL/8h
B
WL/4h
C
WL/2h
D
W/h
Correct Answer
B. WL/4h
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With load W at crown, reactions at supports = W/2 each (symmetry). Taking moments about the crown hinge from right: (W/2)×(L/2) = H×h → H = WL/4h.
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