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Direct estimation of seismic response in reduced-degree-of-freedom isolation and energy dissipation systems

Gkatzogias, K.I. and Kappos, A. J. ORCID: 0000-0002-5566-5021 (2019). Direct estimation of seismic response in reduced-degree-of-freedom isolation and energy dissipation systems. Earthquake Engineering and Structural Dynamics, doi: 10.1002/eqe.3169

Abstract

A methodology for the development of design tools for direct estimation of peak inelastic response in reduced-degree-of-freedom (RDOF) isolation and energy dissipation systems is presented. The suggested procedure is an extension of an earlier method addressing purely hysteretic isolation systems. Herein, the dynamic equation of motion is first normalised to reduce the number of design parameters that significantly affect the response. The sensitivity of normalised response quantities to the amplitude of the ground motion is then investigated through extensive parametric nonlinear dynamic analyses of isolated single-degree-of-freedom (SDOF) systems with linear viscous damping using code-based target spectra. Regression analysis is subsequently employed to develop generalised design equations (GDEs) suitable for design. Further investigations are made to address nonlinear viscous damping and the effect of the transverse component of seismic action in two-degree-of freedom (2DOF) systems under bidirectional excitation, making the procedure applicable to common bridge isolation schemes. GDEs constitute an alternative to equivalent linearisation approaches commonly adopted by codes, informing the selection among alternative isolation and energy dissipations schemes without requiring iterative analysis. The approach is incorporated in the Deformation-Based Design methodology for seismically isolated bridges in a forthcoming paper.

Publication Type: Article
Additional Information: This is the peer reviewed version of the following article: Gkatzogias, KI, Kappos, AJ. Direct estimation of seismic response in reduced‐degree‐of‐freedom isolation and energy dissipation systems. Earthquake Engng Struct Dyn. 2019; 1– 22. , which has been published in final form at https://doi.org/10.1002/eqe.3169. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions.
Publisher Keywords: Seismic isolation, bridges, nonlinear dynamic analysis, viscous dampers, unidirectional/bidirectional excitation, Eurocode 8
Subjects: G Geography. Anthropology. Recreation > GB Physical geography
T Technology > TA Engineering (General). Civil engineering (General)
Departments: School of Mathematics, Computer Science & Engineering > Engineering > Civil Engineering
URI: http://openaccess.city.ac.uk/id/eprint/22445
[img] Text - Accepted Version
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