INTRODUCTION

Most of the buildings in India are normally constructed to resist static loads without considering exact seismic actions. However, this leads to deficiencies in the design of the structures. Typical deficiencies for the studied structure are the following:

• The boundary conditions of the supports. It is important to have proper supports, especially when considering seismic actions since a ductile behaviour of the structure is required.
• If the seismic zone changes for the particular area, the safety measure for the structure should immediately be taken into consideration.
• Even if the building is seismically designed, the data input and the factors considered for seismic designing are not taken into major consideration such as Response Reduction Factor.
• Irregularities in mass and stiffness. The choice of material and element types is important since they affect the weight and strength of the structure.
• Another type of irregularity is the geometry of the structure, the more complex the structure is the more irregularities it tends to get.
• Moreover, the combination of different types of elements and their distribution in the structure affect the overall stiffness and behaviour of the structure.

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