Optimization of retrofit decisions as risk mitigation strategies for infrastructure

Purba, Denissa Sari Darmawi

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https://hdl.handle.net/2142/108706 Copy

Description

Title

Optimization of retrofit decisions as risk mitigation strategies for infrastructure

Author(s)

Purba, Denissa Sari Darmawi

Issue Date

2020-07-23

Director of Research (if dissertation) or Advisor (if thesis)

Gardoni, Paolo

Department of Study

Civil & Environmental Eng

Discipline

Civil Engineering

Degree Granting Institution

University of Illinois at Urbana-Champaign

Degree Name

M.S.

Degree Level

Thesis

Keyword(s)

• Retrofit Strategy
• Infrastructure
• Mitigation Planning
• Matrix-based System Reliability
• Two-stage Stochastic Optimization

Abstract

Retrofit actions have become one of the prominent strategies for infrastructure mitigation planning in reducing vulnerability to hazards. A retrofit action is the application of advanced devices or materials to enhance structural performance. There are three common considerations in the decision-making process of implementing retrofit actions, i.e., limited budgets and resources, the complexity and the size of infrastructure systems, and the uncertainties of the hazards. Considering these three aspects, this study formulates a general stochastic optimization problem to find the optimal retrofit for infrastructure. The optimization problem is formulated to examine two objectives, i.e., to minimize the total retrofit cost and the performance losses of the infrastructure. The proposed formulation uses the Matrix-based System Reliability method to estimate the uncertainty parameters and the Decomposition method to find the optimum solution. Then, the general formulation is used specifically for transportation systems to find the optimal retrofit decisions for bridges.

Graduation Semester

2020-08

Type of Resource

Thesis

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http://hdl.handle.net/2142/108706

Copyright and License Information

Copyright 2020 Denissa Sari Darmawi Purba

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