Retrofitting is a method of updating the strength and structural capacity of an existing structure. Retrofitting of structures is an efficient tool to resist any future earthquakes. While designing a building, we have to follow modern codes and prescribed earthquake resistant design. Possible seismic response of buildings can be assessed by an appropriate seismic evaluation. In qualitative method of seismic evaluation, inputs required are complete information about building, previous performance under earthquakes, visual inspection report and some non destructive test data. Analysis method of seismic evaluation makes use of dynamic analysis of building. Here due consideration of the capacity and ductility of buildings is a must. Analysis method can be further divided into three- They are capacity/demand method, push over analysis and inelastic time history analysis.
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