What primary function do stirrups serve in concrete beams?

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Stirrups in concrete beams primarily serve the function of preventing shearing by providing lateral support. Shear forces can occur in concrete beams due to various loads, and when these forces exceed the tensile strength of the concrete, the beam may fail. Stirrups, which are made from steel and are typically shaped like a U or a closed loop, are placed perpendicular to the length of the beam. They effectively hold the concrete in compression and work to transfer shear forces to the surrounding concrete, thus enhancing the structural integrity of the beam.

This reinforcement is particularly important in areas where shear stresses are expected to be highest, such as near supports or concentrated loads. By counteracting shear, stirrups help to maintain the overall stability and durability of the concrete structure.

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