The rigid portal frame shown in the given figure will not have any side sway if
I1→ the moment of inertia of the column cross-section I2→ the moment of inertia of the beam cross-section
A
I2=2I1
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B
The loading is symmetrical about its centre line
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C
It is subjected to vertical loading only
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D
Loaded in any manner
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Solution
The correct option is B The loading is symmetrical about its centre line The frame is symmetrical in shape and size about a central vertical line. Therefore symmetrical loading about the centre line will not cause any side sway.