Technically, the seismic retrofitting of an existing structure can be performed in different ways for instance, by strengthening the structure, by reducing the seismic demand on the structure, by suitably altering the force transfer mechanism etc. Researchers worldwide have developed and proved several of such retrofitting techniques that may lead to significantly improved seismic behavior of the structures designed according to non-seismic design provisions. Several of such techniques have been applied in practice for improving the seismic performance of real-life existing structures. No single retrofitting technique is suitable for retrofitting every structure and therefore a careful and detailed examination and analysis of the existing structure is needed to identify the deficiencies and weak links that need to be fixed by retrofitting.
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