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Therefore, seismic retrofitting of building structures is one of the most structural assessment of buildings is needed for a proper retrofit measure.1 Analysis of Concrete Roof Trusses 106 vi Retrofitting Design of Building Structures 3.4. · 2 Retrofit, Method for Concrete Roof Trusses 110 3.4. The service life of a building is expected more than 50 years with normal maintenance. Although, all civil engineering structures and buildings are of prime