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Stirrups are used for shear and torsional reinforcement and have many different sections based on the need. You might have4 stirrups spaced at4-6" in a large beam, or a single stirrup.
Ties are typical in compression members like columns, and can be spaced apart or a continuous spiral. They only ever wrap around the longitudinal reinforcement and keep the compression member from "blowing out" under very large loads. They can also be used for shear and torsional reinforcement like stirrups.
