The 'interaction diagram' for RC column design shows relationship between:
Choose the correct answer
Deflection vs. span relationship
Combinations of axial load P and moment M at the failure limit — points inside P-M envelope are safe
Only shear vs. moment relationship
Concrete grade vs. rebar grade selection
Correct Answer
B. Combinations of axial load P and moment M at the failure limit — points inside P-M envelope are safe
Why is this the answer?
P-M interaction diagram: for given column (dimensions, reinforcement): plots combinations of axial load P and bending moment M that cause failure (limit state). Points on curve = balanced failure at each eccentricity. Points inside curve = safe. Points outside = failure. Special points: pure compression (P0, M=0), pure bending (M0, P=0), balanced point (extreme fibre strain = εcu, rebar = εy simultaneously). Used for: eccentrically loaded column design check.
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