Computer · Design of Concrete Structures
A rectangular reinforced concrete column (B × D) is subjected to a uniaxial bending moment M and an axial load P. Which of the following statements correctly describes the qualitative shape of the P-M interaction curve?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1The curve is a horizontal straight line indicating that the axial load capacity is independent of the bending moment.
- 2The curve is a purely parabolic curve where the axial load capacity continuously increases as the bending moment increases.
- 3The curve is a straight line with a constant negative slope from the maximum axial load to the maximum moment.
- 4The curve is non-linear, where the axial load capacity initially increases with an increase in moment up to a balanced point, and then decreases as the moment increases further.✓
Correct answer
The curve is non-linear, where the axial load capacity initially increases with an increase in moment up to a balanced point, and then decreases as the moment increases further.
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