ANALYSIS OF A MULTI-STOREYED BUILDING DAMAGED DURING GUJARAT EARTHQUAKE

Abstract

Major Earthquakes cause large-scale devastation rendering people dead, injured, homeless and hungry. One such earthquake hit Gujarat State on 26th January 2001. Many structures failed including a large number of multistory buildings. A multistory building `Shikhar Apartments' located at Vejalpur, Ahmedabad was one amongst those, which left about 110 dead and many injured. The structure has been taken here for analysis. An analytical model has been prepared for the building. The effects of the eccentricities, infilled walls and the soil-structure interaction have been taken into account. Also a parametric study between different models available for the equivalent diagonal strut is carried out. The analysis has been done for two type of models. One considering the complete floor of all the blocks to behave as one and another is considering that the floor of individual blocks had behaved separately. The analysis was carried out with the commercially available package STAAD-Pro using the Response-Spectrum Method given in IS: -1893-1984 and the results listed. The difference in the sizes of different members provided and those required is shown. The building is then modified by adding few more structural members and changing the structural configuration. Time-history analysis of this new configured structure is done using the ground-motion of the Gujarat Earthquake to depict that if the structure had been designed in that manner, it would have survived the earthquake.