Authors: Shubhangi Sondhiya, Deepesh Malviya
Abstract: These seismic risks are considered the prime cause for concern in seismic zones and earthquake-prone areas around the world. Over time, a sequence of earthquake motions with different seismic intensity has been used to conduct the investigation and analyze the structural dynamics. Analyses considering the effect of isolated structures showed that the isolators restrict the lateral loads transmitted to the structure, which, in turn, has the tendency to reduce the sizes of building components. In this study, design, operation, testing, and applicability of base isolation are analyzed in detail as per Indian Standards. Base isolation has been found to be one of the popular design approaches in recent times. A building structure is taken as a case study model for this study, and contemporary design tools are also applied for the analysis. Conclusions are drawn from the results obtained. We'll discuss the probable advantages of base isolation over the conventional dynamic analysis. This chapter deals with the design details of the models and step followed to design the building. This study is conducted on a G+11-story building located on soft soil. The structure is designed as a college building (with plan irregularity) situated in Seismic Zone V and analyzed using ETABS 2022. For the analysis, two models are considered: Model M-1, which has a fixed base, and Model M-2, which incorporates a base isolator. The comparative analysis between the fixed-base model (M–1) and the base-isolated model (M–2) clearly demonstrates the effectiveness of base isolation in improving seismic performance. The base-isolated structure shows reduced base shear, displacement, and overturning moments by approximately 25–30%, indicating enhanced stability and safety. Although story drift slightly increases due to controlled base movement, this behavior helps in dissipating seismic energy and reducing damage to the superstructure. Overall, base isolation significantly enhances structural resilience, minimizes earthquake-induced forces, and provides an efficient and reliable solution for earthquake-resistant design in multi-storey buildings. Overall, the comparative study clearly demonstrates that the implementation of base isolation considerably enhances the seismic performance of structures. It reduces base shear, displacement, and overturning moments while allowing controlled drift, thereby ensuring improved safety, flexibility, and durability. These outcomes confirm that base isolation is a highly effective and reliable strategy for seismic risk mitigation in multi-storey buildings.
DOI: http://doi.org/10.5281/zenodo.18066513
