Dynamic Behaviour of Asymmetric RCC Irregular Framed Building using Designed LRB

Nowadays most of the buildings are dissimilar in shape, both in plan and elevation. When it is exposed to severe earthquakes it may lead to destruction of the building. Based on the survey of past earthquake data it is seen that most of the buildings with irregular shape collapsed due to uneven distribution of load compared to buildings with regular shape. Also, these buildings are not designed by considering the earthquake loads which is why they are easily vulnerable to collapse. In recent days earthquake loads should be considered as mandatory in the region of earthquake prone areas. Several technologies are also introduced to reduce the seismic activity on buildings, bridges etc. Base isolation is one of the new and modern technologies of this kind. Base isolation (BI) is a method that is applied around the world to safeguard the structures from the disaster effects of earthquake. The establishment of isolator in substructure considerably decreases the mode period of building, it minimizes the prospect of vibration giving rise to quality seismic performance of the building. The study was carried out to compare the performance (effectiveness) of base isolation in multistoreyed RC frame plan irregular and vertical irregular building. A RCC building of 13 (G+12) floors with plan irregularity & vertical irregularity, & different base conditions, like, fixed and isolated base of dimension 40 m x 45 m has been taken for seismic analysis. Base isolation effectiveness using LRB (lead rubber bearing) has been studied by THA (time history analysis) method taking Bhuj earthquake data. Four models have been considered for analysis and the obtained results such as torsional behaviour, storey shear, displacement, storey drift have been compared between buildings with fixed base and buildings with base isolation.