SESIMIC DESIGN OF BUILDINGSWITH IRREGULAR CONFIGURATIONS

Abstract

To perform well in earthquake, a building should possess four main attributes, namely simple and regular configuration, and adequate lateral strength, stiffness and ductility. With the increase in demand of high rise building and new architectural design, the irregularities in buildings has grown up and in this dissertation the comparative performance of floating column irregularity with normal conventional building has been discussed, and the two design techniques i.e. FBD (IS code method) and DDBD is used to enhance the performance of floating column building. It is found that this vertical irregularity is critical due to non-definite path in load transfer and show large stress concentration in columns adjacent to the floating columns. The storey displacement as well as interstorey drift ratio of floating column building is very high with respect to normal conventional building. It is found in the study that the overhanging portion do not contribute to lateral stiffness of building instead it shows more response in Z direction, thus making it to fail in vertical earthquake. The design from the two methods enhance the performance of floating column building and the study shows, the DDBD design performs better than FBD, though it still lags in performance with conventional building, over size section is needed for taking account of reinforcement and increase the capacity of the structure