Civil Engineering MCQAE Level Civil Engineering
A three-hinged parabolic arch of span L and rise h carries a UDL of w over the entire span. The horizontal thrust H at each springing is:
Structural AnalysisThree-hinged ArchMEDIUM
Choose the correct answer
A
wL²/4h
B
wL²/8h
C
wL²/16h
D
wL/4h
Correct Answer
B. wL²/8h
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For a three-hinged arch under UDL, taking moments about crown hinge: H × h = wL²/8 (same as midspan BM of equivalent SS beam). Hence H = wL²/8h.
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