SEISMIC PERFORMANCES EVALUATION OF EXISTING BUILDING DESIGN AS PER OLD AND PRESENT CODE OF IS:456-1978 &2000

Civil Engineering

Codes of practice for plain and reinforced concrete and earthquake resistant design are revised periodically. Assessing the capacity of existing building as per the requirement of new codes of practice is an important task. In this thesis, two typical designs of a 6-Storey building are carried out as per old codes and present code of practice for two load cases and they are, i) Case-1 For gravity load plus earthquake load as per IS: 456-1978 and IS: 1893- 1984(Limit state method), ii) Case-2: For gravity load plus earthquake load as per IS: 456-2000 and IS: 1893-2002 (Limit state method). With these load cases the performance evaluation of the building is carried out with nonlinear static analyses and the capacity curves are generated. From these curves, the variation in maximum base shear and roof displacement capacities for the two different load cases are brought out clearly. The performance points are obtained and the corresponding base shear and roof displacements are arrived for IS 1893 – 2002, Design Basis Earthquake (DBE) and Maximum Considered Earthquake (MCE). All the two designs are found to meet the design basis earthquake demand. However, only case-2, is found to meet the performance point for maximum considered earthquake.

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