Steel jacketingreinforcement method is a reinforcement method in which section steel (usually angle steel) is wrapped around the four corners (or two corners) of a member to enhance its force-bearing performance.

The steel jacketing method can greatly increase the bearing capacity, increase the ductility and rigidity of the component without basically increasing the size of the component, and the force is more reliable. It is applicable to the reinforcement of the structure that does not allow to increase the cross-sectional size of the original member, but requires a large increase in the load-bearing capacity of the cross-section, and increased ductility and rigidity.

Steel jacketing not only provides enough confinement but also prevents deterioration of shell concrete, which is the main reason of bond failure and buckling of longitudinal bars.