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1. Plane sections normal to axis remain plane after bending. This implies that strain is
proportional to the distance from neutral axis.
2. Maximum strain in concrete of compression zone at failure is 0.0035 in bending
3. Tensile strength of concrete is ignored.
4. The stress-strain curve for the concrete in compression may be assumed to be
rectangle, trapezium, parabola or any other shape which results in prediction of
strength in substantial agreement with test results.
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