What is the fundamental assumption in flexural theory? Is it valid at the ultimate state?
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The basic assumptions in flexural design of RCC Beams and slabs are as per ACI:
1. Sections perpendicular to the axis of bending that are plane before bending remain plane after bending.
2. A perfect bond exists between the reinforcement and the concrete such that the strain in the reinforcement is equal to the strain in the concrete at the same level.
3. The strains in both the concrete and the reinforcement are assumed to be directly proportional to the distance from the neutral axis (ACI 10.2.2) [ACI Committee 318, 1992].
4. Concrete is assumed to fail when the compressive strain reaches 0.003 (ACI 10.2.3).
1. Sections perpendicular to the axis of bending that are plane before bending remain plane after bending.
2. A perfect bond exists between the reinforcement and the concrete such that the strain in the reinforcement is equal to the strain in the concrete at the same level.
3. The strains in both the concrete and the reinforcement are assumed to be directly proportional to the distance from the neutral axis (ACI 10.2.2) [ACI Committee 318, 1992].
4. Concrete is assumed to fail when the compressive strain reaches 0.003 (ACI 10.2.3).
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