Authors: Ankit H. Sodha; Devesh P. Soni; Sandip A. Vasanwala
Addresses: Applied Mechanics Department, Sardar Vallabhbhai National Institute of Technology, Surat-395007, India ' Civil Engineering Department, Sardar Vallabhbhai Patel Institute of Technology, Vasad-388306, India ' Applied Mechanics Department, Sardar Vallabhbhai National Institute of Technology, Surat-395007, India
Abstract: Although nonlinear hysteretic model of the quintuple friction pendulum (QTFP) isolation system allow a detailed appraisal of response by means of nonlinear time-history analyses, such analyses are dilatory and not suitable for the early stages of design where appropriate configurations are required for the desirable performance. However, it would be favourable to have a linear visco-elastic model to determine peak dynamic response parameters at the preliminary design to achieve desirable performance. A comparative study of linear and nonlinear model of the QTFP depends upon equivalent effective stiffness and effective damping for seismic response quantities are presented. It is observed that the linear model gives consistently good and conservative estimate of peak isolator displacement and base shear whereas, it under-predicates the floor acceleration as compared to nonlinear model. Further, the effect of superstructure flexibility for both models is studied and linear model is found suitable for flexible superstructures too.
Keywords: seismic isolation; quintuple friction pendulum system; multi hazard level earthquake; linear visco-elastic model.
International Journal of Structural Engineering, 2021 Vol.11 No.1, pp.19 - 43
Received: 07 Dec 2019
Accepted: 28 Mar 2020
Published online: 04 Jan 2021 *