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Proceedings Paper

Design of isolated buildings with S-FBI system subjected to near-fault earthquakes using NSGA-II algorithm
Author(s): O. E. Ozbulut; B. Silwal
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Paper Abstract

This study investigates the optimum design parameters of a superelastic friction base isolator (S-FBI) system through a multi-objective genetic algorithm and performance-based evaluation approach. The S-FBI system consists of a flat steel- PTFE sliding bearing and a superelastic NiTi shape memory alloy (SMA) device. Sliding bearing limits the transfer of shear across the isolation interface and provides damping from sliding friction. SMA device provides restoring force capability to the isolation system together with additional damping characteristics. A three-story building is modeled with S-FBI isolation system. Multiple-objective numerical optimization that simultaneously minimizes isolation-level displacements and superstructure response is carried out with a genetic algorithm (GA) in order to optimize S-FBI system. Nonlinear time history analyses of the building with S-FBI system are performed. A set of 20 near-field ground motion records are used in numerical simulations. Results show that S-FBI system successfully control response of the buildings against near-fault earthquakes without sacrificing in isolation efficacy and producing large isolation-level deformations.

Paper Details

Date Published: 1 April 2014
PDF: 11 pages
Proc. SPIE 9057, Active and Passive Smart Structures and Integrated Systems 2014, 905709 (1 April 2014); doi: 10.1117/12.2045174
Show Author Affiliations
O. E. Ozbulut, Univ. of Virginia (United States)
B. Silwal, Univ. of Virginia (United States)

Published in SPIE Proceedings Vol. 9057:
Active and Passive Smart Structures and Integrated Systems 2014
Wei-Hsin Liao, Editor(s)

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