TO STUDY OF SOFT STOREY TO CONSTRUCT EARTHQUAKE RESISTING STRUCTURE-REVIEW

CIVIL ENGINEERING

Soft storeys in a high rise building play an important role on its seismic performance. It is the one in which the lateral stiffness is less than 70 percent of that in the storey above or less than 80 percent of the average lateral stiffness of the three storeys above. In high rise building or multi storey building, soft storey construction is a typical feature because of urbanization and the space occupancy considerations. Such features are highly undesirable in buildings built in seismically active areas. This has been verified in numerous experiences of strong shaking during the part earthquake. Due to the considerations of occupancy and architectural appearance, especially in the entrance floor and on one of the intermediate levels, inner sections between columns and outer walls are not constructed in a way they are done in other stories or rigidity of the single structure in the storeys are different. These sections in the buildings are generally used for sales stores, restaurants, bank branches, installations and lightening. These are labelled as soft storeys in literature. Most of the burden falls on soft storey.

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