Investigating the Seismic Response of Coupled Isolated Buildings under Stochastic Ground Motions

International Journal of Civil Engineering

© 2024 by SSRG - IJCE Journal

Volume 11 Issue 2

Year of Publication : 2024

Authors : Dipak Jivani, Ramnik Dhamsaniya

10.14445/23488352/IJCE-V11I2P109

How to Cite?

Dipak Jivani, Ramnik Dhamsaniya, "Investigating the Seismic Response of Coupled Isolated Buildings under Stochastic Ground Motions," SSRG International Journal of Civil Engineering, vol. 11,  no. 2, pp. 93-107, 2024. Crossref, https://doi.org/10.14445/23488352/IJCE-V11I2P109

Abstract:

This paper studies the torsional behaviour of a Triple Friction Pendulum (TFP) isolator subjected to stochastic ground motions. Stochastic ground motions are simulated by implementing the Monte Carlo technique. To investigate the torsional response of TFP isolated systems with various superstructure and isolation system eccentricities, along with the superstructures uncoupled torsional to lateral frequency ratio, nonlinear dynamic analyses are carried out. A response of the torsionally uncoupled TFP isolated system is compared with the corresponding response of the torsionally coupled TFP isolated system. Furthermore, a parametric investigation is performed to evaluate the impact of superstructure flexibility on the torsional response of torsionally coupled TFP-isolated buildings. The displacement obtained due to eccentricity in the system is contrasted with the design-bearing displacement recommended by the Uniform Building Code. It has been found that the base-isolated building’s seismic response is significantly influenced by the torsional coupling caused by eccentricities at the isolator level. Additionally, when the superstructure time period increases, a rising torsional response of the structure is seen. It is revealed that when isolation eccentricities occur, the impacts of superstructure eccentricity are diminished. The UBC standard’s design bearing displacement is considered conservative for the isolation eccentricities.

Keywords:

Base isolation, Seismic response, Stochastic ground motion, Triple Friction Pendulum isolator, Torsional response.

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