SEISMIC EFFECT OF SOFT STORY AT DIFFERENT LEVEL IN VARIOUS CONFIGURATION OF TALL BUILDING: A REVIEW
Keywords:
Vertical irregularities, Soft Story, Tall building, Seismic Effect, Story Stiffness, Structural Systems, Tubular systemsAbstract
Vertical growth is necessity due to increasing population and scarcity of urban land. Due to this reason,
RC tall buildings with soft story are usually constructed in many countries where the soft story is constructed without
infill walls at different levels. Such buildings have performed poorly during moderate shaking in the past. The
existence of infills in upper stories makes them extensively stiffer as compared to the soft story. As a result, the soft
story columns are inadequate to resist high ductility demand. For that lateral load resisting systems for tall buildings
were developed. These systems are developed to deal with gravity loads and seismic activities. This paper reviews about
seismic effect of soft story and structural systems for tall buildings. Different types tubular systems such as framed
tube, braced framed tube, bundled tube and tube-in-tube systems are explained. Here, preliminary design methods
are explained for analysis of various systems for 20 to 80 story buildings. It is remarked that it is needed to observe
seismic effect of soft story on tall building with different configuration of tubular system.
