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Theory of Structures - Engineering

Q1:

A rectangular column shown in the given figure carries a load P having eccentricities ex and ev along X and Y axes. The stress at any point (x, y) is

A

B

C

D

ANS:A -

In bending stress equation, why it is Ix in both the direction?

I think it should be Ix for Mx and Iy for My. If this statement is correct, then equation will be Combined stress =(P/A) + (Mx/Ix) + (My/Iy). Is this right? Please tell me.