LOADING
Question
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.
it is subjected to vertical loading only
B.
I2 = 2I1
C.
the loading is symmetrical about its centre line
D.
loaded in any manner
Answer ( Option C)

the loading is symmetrical about its centre line

Solution

Symmetrical frame having symmetrical loading about its central line will not cause any sway.

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