Technical Papers
Mar 11, 2022

Risk-Based Optimal Design of Seismic Protective Devices for a Multicomponent Bridge System Using Parameterized Annual Repair Cost Ratio

Publication: Journal of Structural Engineering
Volume 148, Issue 5

Abstract

Base isolators and fluid viscous dampers are viable protective devices that have been commonly considered in the seismic protection of civil engineering structures. However, the optimal design of these devices remains a tedious and iterative undertaking due to the uncertainty of ground motions, the nonlinear behavior of the structure, and its change of dynamic characteristics (i.e., effective stiffness and damping ratio) under each new design. The optimal design problem becomes more challenging concerning a multiresponse bridge system where conflicting damage potential is often expected among multiple bridge components (e.g., column, bearing, shear key, deck unseating, foundation). In this respect, this study develops a risk-based optimization strategy that directly links the expected annual repair cost ratio (ARCR) of the bridge to the design parameters of base isolators and fluid dampers. This strategy is achieved by devising a multistep workflow that integrates a seismic hazard model, a design of experiment for bearings and dampers, a logistic regression towards parameterized component-level fragility models, and a bridge system-level seismic loss assessment. The developed ARCR is parameterized as a convex function of the influential parameters of seismic protective devices. As such, optimal bearing and damper designs can be pinpointed by directly visualizing the global minimum of the parameterized ARCR surface. The optimal design is carried out against a typical reinforced concrete highway bridge in California that is installed with the fluid dampers and three types of widely-used isolation bearings—the elastomeric bearing, lead-rubber bearing, and friction pendulum system. It is shown that optimal design parameters can be obtained to significantly reduce the expected ARCR of the bridge, whereas combining optimally designed bearings and dampers can provide the minimum seismic risk.

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Data Availability Statement

Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.

Acknowledgments

This research has been supported by the NSERC Discovery Grant of Canada under Funding No. RGPIN-2020-04156. Any opinions, findings, conclusions, or recommendations expressed in this paper are those of the authors and do not necessarily reflect the official views or policies of the funding agencies.

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Journal of Structural Engineering
Volume 148Issue 5May 2022

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Received: Aug 2, 2021
Accepted: Jan 6, 2022
Published online: Mar 11, 2022
Published in print: May 1, 2022
Discussion open until: Aug 11, 2022

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Graduate Student, Dept. of Civil Engineering, McGill Univ., Montreal, QC, Canada H3A0C3. ORCID: https://orcid.org/0000-0002-2078-0038. Email: [email protected]
Assistant Professor, Dept. of Civil Engineering, McGill Univ., Montreal, QC, Canada H3A0C3 (corresponding author). ORCID: https://orcid.org/0000-0001-7470-9459. Email: [email protected]

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Cited by

  • Simplified Nonlinear Damping Force Formula for Rotary Eddy Current Dampers and Comparative Hazard Analysis under Seismic Excitation with Fluid Viscous Dampers, Journal of Structural Engineering, 10.1061/JSENDH.STENG-12809, 150, 4, (2024).
  • Risk-Informed and Life-Cycle Analyses of Structures and Infrastructures, Journal of Structural Engineering, 10.1061/(ASCE)ST.1943-541X.0003495, 148, 12, (2022).

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