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Confining reinforcement refers to reinforcement that is applied in such a way that it "confines" the concrete within it to provide increased strength and deflection capabilities. Confining reinforcement is used in both beam and column designs. In columns, spiral or helix reinforcement is implemented through the column, spiraling from top to bottom, with vertical longitudinal bars running through the inside of the helix. This prevents the concrete's diameter becoming larger under the applied load leading to failure. In correct terms it prevents the poisson's effect within the column.

In beams the confining reinforcement is generally place within the compressive region of the beam. This can be utilised to increase the yield deflection of the beam as well as the yield and ultimate loads. This is a good option for increasing the ductility of high strength concrete beams which would normally fail in a brittle manner.

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