The rigid portal frame shown in the given figure will not have any side sway if (Note: I2 = the moment of inertia of the column cross-section, I1 = the moment of inertia of the beam cross-section)

The rigid portal frame shown in the given figure will not have any side sway if (Note: I2 = the moment of inertia of the column cross-section, I1 = the moment of inertia of the beam cross-section) Correct Answer the loading is symmetrical about its center line

Explanation

Conditions for sway are:

a) If the supports are not in the same position, sway occurs.

b) If the applied load is not acting at the center of the structure (eccentric loading), sway will occur.

c) When the loading is asymmetrical.

d) Different end conditions of the columns of the frame

e) Non-uniform sections of the members

f) Horizontal loading on a column of the frame

g) Settlement of the supports of the frame

Given, 

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As the figure is symmetrical, As it should not have any sway. The loading is symmetrical about its centerline (Because if loading is asymmetrical it causes sway) 

Examples of Non-Sway

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