Contraflexure
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The point or points of contraflexure are the locations in a beam where no bending occurs. In a bending moment diagram, it is the point at which the bending moment curve intersects with the zero line. Knowing the place of the contraflexure is especially useful when designing reinforced concrete beams. This is because where contraflexure occurs the reinforcement does not have to be placed and can if necessary swap faces of the beam.
