Seismic Performance of Multi-Storey Composite Column Framed Buildings (G+3, G+5 and G+8) with Lead Rubber Bearing Base Isolation Using SAP2000
DOI:
https://doi.org/10.67308/irjist.75Keywords:
Base Isolation, Lead Rubber Bearing (LRB), Composite Column Structure, Nonlinear Time History Analysis, SAP2000, Base Shear, Storey DriftAbstract
In earthquake-sensitive areas, especially for multi-storey buildings, structural damage can be severe due to earthquake-induced forces. Base isolation systems, particularly Lead Rubber Bearings (LRBs), have proven effective in enhancing seismic performance by minimizing the transmission of ground motion to the superstructure. In this study, the seismic behaviour of composite column framed buildings with G+3, G+5, and G+8 configurations was analysed using SAP2000 under fixed-base and LRB base-isolated conditions. Three-dimensional numerical models were developed in accordance with IS 1893:2016 and IS 456:2000 and analysed using the Nonlinear Time History Analysis (NLTH) method. Structural response was evaluated in terms of natural time period, storey displacement, inter-storey drift, and base shear. The results showed that the fundamental time period increased significantly with the introduction of LRB isolation, leading to a reduction in seismic force demand. The base-isolated structures reduced base shear by 50.70%, 44.42%, and 29.42% for G+3, G+5, and G+8 buildings, respectively, while maintaining inter-storey drift values within the permissible code limits. Although the flexibility of the isolation system resulted in increased storey displacements, these remained within acceptable performance limits and contributed to enhanced energy dissipation during seismic events. The findings demonstrate that LRB base isolation effectively reduces seismic demand and enhances the seismic performance of composite column buildings, making it a suitable and reliable solution for the design of resilient multi-storey structures in earthquake-prone regions.
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