Civil Engineering MCQAE Level Civil Engineering
In a symmetric portal frame with fixed column bases and a horizontal load H at beam level, assuming rigid beam and equal columns of height h, the moment at the BASE of each column is:
Structural AnalysisPortal Frame Column MomentsMEDIUM
Choose the correct answer
A
Hh
B
Hh/2
C
Hh/4
D
Hh/8
Correct Answer
C. Hh/4
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Each column carries H/2 shear (by symmetry). For a fixed-fixed column under lateral shear Q: M_base = Q×h/2 (antisymmetric). With Q = H/2: M_base = H×h/4.
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