The main reinforcement methods of concrete structure can be summed up into three types according to their characteristics, namely, “concrete method”, “external bonding reinforcement” and “mechanical strengthening method”.

“Concrete method” refers to the reinforcement method of strengthening the concrete structure or reinforcement by increasing the section of the concrete component, improving the strength grade of concrete or improving the quality of the concrete construction. The emphasis of the reinforcement is concrete, mainly including the reinforcement method of enlarging the cross section and the replacement of the concrete.

The “external bonding strengthening method” refers to the reinforcement methods for improving the bearing capacity and seismic performance of the steel, steel plate or fiber composite material outside the original concrete components by grouting or structural glue, including the external bonded steel (outer steel jacketing) reinforcement method, the bonded steel plate reinforcement method and the bonded fiberreinfroced polymer (FRP) composite  reinforcement method.

“Mechanical strengthening method” refers to the application of the principle of building mechanics, by changing the way of force transmission or providing reverse bending moment to remove, reduce or reduce the internal force, so that the original concrete members meet the loading requirements of the reinforcement method, and the mechanical reinforcement method includes the addition of the fulcrum reinforcement method and the external prestressed reinforcement method.

categories: direct reinforcement and indirect reinforcement.