Seismic Vulnerability of Bridges in Oregon Highway Network
Author | : Selamawit Tesfayesus Mehary |
Publisher | : |
Total Pages | : 246 |
Release | : 2010 |
Genre | : Bridges |
ISBN | : |
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Author | : Selamawit Tesfayesus Mehary |
Publisher | : |
Total Pages | : 246 |
Release | : 2010 |
Genre | : Bridges |
ISBN | : |
Author | : |
Publisher | : |
Total Pages | : 186 |
Release | : 2018 |
Genre | : Bridges |
ISBN | : |
Geologists have indicated that the question is not if a catastrophic earthquake will occur in Oregon but when one will occur. Scientists estimate that there is close to 40 percent conditional probability that a Cascadia subduction zone earthquake of magnitude 8.0 or above will strike Oregon in the next 50 years. In addition, the majority of Oregon's bridge inventory was built prior to the current understanding of bridge response and prior to current understanding of the expected earthquake demands. In order to minimize potential bridge damage in the case of an earthquake, one approach is to retrofit seismically deficient bridges. However, often times the decision maker is faced with the difficulty of selecting only a few bridges within the inadequate ones. Hence, the issue of prioritizing upgrading naturally arises. The goal of this study is to assess and refine bridge prioritization methodology to be utilized for ranking Oregon's bridge inventory. CFRP retrofit has been experimentally and analytically evaluated to demonstrate the effectiveness of the technique and was found to be an efficient and economical option. A vulnerability assessment estimates that close to 30 percent of Oregon's highway bridge inventory will sustain moderate damage to collapse. However, retrofitting two most common bridge types in the inventory will reduce the number of damaged bridges by about 70 percent. A cost-benefit assessment that takes into consideration direct and indirect costs associated with damaged bridges and retrofitting of bridges shows that the benefit is up to three times the cost to retrofit. The same principle was applied to rank twelve highway segments for seismic retrofit considered important by Oregon Department of Transportation. One selected segment was considered to be retrofitted and vulnerability assessed. The benefit to cost ratios for each assessment was compared and the highway segments were ranked accordingly. The top five segments in the ranking happen to be located in the East-West corridor connecting I-5 to US-101.
Author | : Aleksandar Stevanovic |
Publisher | : |
Total Pages | : 92 |
Release | : 2010 |
Genre | : Earthquake damage |
ISBN | : |
"This report presents estimated traffic disruption user delay costs resulting from two earthquake scenarios in Utah. The VISUM traffic macro-simulation model was used to estimate the delay-based user costs."--Executive summary.
Author | : C. Vail Fletcher |
Publisher | : Lexington Books |
Total Pages | : 279 |
Release | : 2018-05-23 |
Genre | : Language Arts & Disciplines |
ISBN | : 1498556124 |
Natural Disasters and Risk Communication: Implications of the Cascadia Subduction Zone Megaquake asks and addresses how we communicate about natural disasters and what effect our communication has on natural disaster education, understanding, assessment of risk, preparation, and recovery. The chapters of this book present expertise, analyses, and perspectives that are designed to help us better comprehend and deal with the natural risks such as the Cascadia Subduction Zone. It seeks to move past primal, fear-induced physiological and emotional responses to crises with the understanding that if we accept that the disaster will occur, expect it, and learn how we can prepare, we can calm the collective panicked beats of our hearts as we wait for its first tremors.
Author | : |
Publisher | : DIANE Publishing |
Total Pages | : 76 |
Release | : 1993-07 |
Genre | : Technology & Engineering |
ISBN | : 9781568069807 |
Focuses on threats that earthquakes pose to the nation1s bridges.
Author | : United States. General Accounting Office |
Publisher | : |
Total Pages | : 44 |
Release | : 1992 |
Genre | : Bridges |
ISBN | : |
Author | : Martha Sartain |
Publisher | : |
Total Pages | : 0 |
Release | : 1999 |
Genre | : Bridges |
ISBN | : |
The State of Oregon has unique seismic risks associated with its location adjacent to the Cascadia Subduction Zone. The nature and probability of this risk are examined. Because this risk was only recently identified, most of the state's bridges are designed for little or no seismic loads, and thus require a comprehensive program of seismic retrofit. Divided into Phase 1 (superstructure) and Phase 2 (substructure), the retrofit needs have been identified with respect to structure vulnerability and criticality, and work has been proposed and prioritized to account for cost-effectiveness and lifeline classification.
Author | : Ayman A. Shama |
Publisher | : |
Total Pages | : 202 |
Release | : 2007 |
Genre | : Earthquake engineering |
ISBN | : |