Assessment Prioritization And Communication Of Risks Of Failures Of A Bridge Scour Countermeasure Over A Range Of Flow Events

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Assessment, Prioritization, and Communication of Risks of Failures of a Bridge Scour Countermeasure Over a Range of Flow Events

Author : Fahmidah Ashraf
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (927 download)

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Book Synopsis Assessment, Prioritization, and Communication of Risks of Failures of a Bridge Scour Countermeasure Over a Range of Flow Events by : Fahmidah Ashraf

Download or read book Assessment, Prioritization, and Communication of Risks of Failures of a Bridge Scour Countermeasure Over a Range of Flow Events written by Fahmidah Ashraf and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Assessment, prioritization, and communication of risks of failures of countermeasures over a wide range of flow events can be very effective in the selection and the design of an appropriate countermeasure considering the uncertainty in the performance of a countermeasure in an uncertain complex river system. In this study, a risk-based approach is developed for assessing, prioritizing, and communicating the risks of failure modes of a bridge scour countermeasure using Failure Modes and Effects Analysis (FMEA) tool. In FMEA, the risks of failure modes are derived from the severity (S) and occurrence (O) ratings. Widely used approach of Risk Priority Number (RPN), product of the risk ratings, is improved to assess risks overcoming the mathematical limitations of Risk Priority Numbers (RPNs). Another simple and effective approach of assessing risks, Risk Priority Code (RPC), is used to make a comparison between the RPN and RPC results, and to find out which approach is comparatively more rigorous. The appropriate risk assessment approach is then used to build risk matrix. Risk matrix is a table that maps severity (S) and occurrence (O) ratings to the corresponding risk priority level. The developed risk matrix will be able to assess and prioritize the risks of failure modes of a countermeasure using only the qualitative information represented by S and O ratings. An approach of defining and incorporating confidence level in risk matrix is developed to provide more comprehensiveness and/or completeness to the risk matrix. Such an approach of developing risk matrix will enable bridge engineers to use risk matrix as a basis for making risk-informed decision. To determine the relative change in a risk priority level over a range of flow conditions, a study is then carried out focusing on the backwater in the vicinity of a bridge. The backwater is simulated using one dimensional model Hydrologic Engineering Centers River Analysis System (HEC-RAS). The effects of backwater are defined based on the monitoring survey data. Then, the developed risk matrix is used to determine any change in the risk priority level considering the backwater effects. Such an approach is simple enough to implement in the planning phase to account for the effects of flood events in the risk-based approach of selection and design of a countermeasure. Given the unavailability of quantitative information and the limited resources and time, the study results have important implications in the selection of an appropriate countermeasure and/or to pay special attention to certain components of a countermeasure which are at a higher risks in some situations.

Countermeasures to Protect Bridge Piers from Scour

Author : Peter Frederick Lagasse
Publisher : Transportation Research Board
ISBN 13 : 0309099099
Total Pages : 284 pages
Book Rating : 4.3/5 (9 download)

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Book Synopsis Countermeasures to Protect Bridge Piers from Scour by : Peter Frederick Lagasse

Download or read book Countermeasures to Protect Bridge Piers from Scour written by Peter Frederick Lagasse and published by Transportation Research Board. This book was released on 2007 with total page 284 pages. Available in PDF, EPUB and Kindle. Book excerpt: Explores practical selection criteria for bridge-pier scour countermeasures; guidelines and specifications for the design and construction of those countermeasures; and guidelines for their inspection, maintenance, and performance evaluation. Produced along with the report is an interactive version of the countermeasure selection methodology, which defines the proper conditions for the use of each specific countermeasure, and a reference document that contains detailed laboratory testing results and translations of three German "Code of Practice" documents.

Countermeasures to Protect Bridge Abutments from Scour

Author : Brian D. Barkdoll
Publisher : Transportation Research Board
ISBN 13 : 0309098955
Total Pages : 230 pages
Book Rating : 4.3/5 (9 download)

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Book Synopsis Countermeasures to Protect Bridge Abutments from Scour by : Brian D. Barkdoll

Download or read book Countermeasures to Protect Bridge Abutments from Scour written by Brian D. Barkdoll and published by Transportation Research Board. This book was released on 2007 with total page 230 pages. Available in PDF, EPUB and Kindle. Book excerpt: Examines selection criteria and guidelines for the design and construction of countermeasures to protect bridge abutments and approach embankments from scour damage. The report explores two common forms of bridge abutments--wing-wall (vertical face with angled walls into the bank) and spill-through (angled face).

Bridge Scour and Stream Instability Countermeasures

Author : U. S. Department of Transportation
Publisher :
ISBN 13 : 9781329651029
Total Pages : 0 pages
Book Rating : 4.6/5 (51 download)

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Book Synopsis Bridge Scour and Stream Instability Countermeasures by : U. S. Department of Transportation

Download or read book Bridge Scour and Stream Instability Countermeasures written by U. S. Department of Transportation and published by . This book was released on 2015-10-27 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of this document is to identify and provide design guidelines for bridge scour and stream instability countermeasures that have been implemented by various State departments of transportation (DOTs) in the United States. Countermeasure experience, selection, and design guidance are consolidated from other FHWA publications in this document to support a comprehensive analysis of scour and stream instability problems and provide a range of solutions to those problems. The results of recently completed National Cooperative Highway Research Program (NCHRP) projects are incorporated in the design guidance, including: countermeasures to protect bridge piers and abutments from scour; riprap design criteria, specifications, and quality control, and environmentally sensitive channel and bank protection measures. Selected innovative countermeasure concepts and guidance derived from practice outside the United States are introduced. In addition, guidance for the preparation of Plans of Action ...

Flood Scour for Bridges and Highways

Author : Mohiuddin A. Khan
Publisher : McGraw Hill Professional
ISBN 13 : 0071825096
Total Pages : 382 pages
Book Rating : 4.0/5 (718 download)

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Book Synopsis Flood Scour for Bridges and Highways by : Mohiuddin A. Khan

Download or read book Flood Scour for Bridges and Highways written by Mohiuddin A. Khan and published by McGraw Hill Professional. This book was released on 2015-02-05 with total page 382 pages. Available in PDF, EPUB and Kindle. Book excerpt: Publisher's Note: Products purchased from Third Party sellers are not guaranteed by the publisher for quality, authenticity, or access to any online entitlements included with the product. Proven methods for preventing and mitigating bridge and highway flood scour Offering detailed guidelines on bridge scour countermeasures, this comprehensive resource provides a proactive strategy for the design and construction of bridges to prevent scour, as well as a reactive plan for post-flood disaster management. Topics discussed include erosion, causes of scour, AASHTO design codes, hydrology, hydraulics, scour analysis, inspection methods, and modern materials technology. Real-world case studies illustrate the concepts presented. The authoritative information in this practical guide will help you to develop more efficient and cost-effective design processes and bridge management systems for river bridges subjected to floods. Flood Scour for Bridges and Highways covers: Floods, scour problems, and mitigation River instability caused by flow obstructions Past failures and bridges vulnerable to failure Geotechnical and hydraulic issues at scour-critical rivers and bridges Hydrology, floods, and scour-critical bridges Estimating scour depths and selecting applicable countermeasures Inspections, ratings, and monitoring countermeasures FHWA, HEC-18, and HEC-23 scour countermeasures as remediation Innovative methods of flood control and disaster management

Bridge Pressure Flow Scour for Clear Water Conditions

Author : U.s. Department of Transportation
Publisher : CreateSpace
ISBN 13 : 9781508811039
Total Pages : 62 pages
Book Rating : 4.8/5 (11 download)

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Book Synopsis Bridge Pressure Flow Scour for Clear Water Conditions by : U.s. Department of Transportation

Download or read book Bridge Pressure Flow Scour for Clear Water Conditions written by U.s. Department of Transportation and published by CreateSpace. This book was released on 2015-03-10 with total page 62 pages. Available in PDF, EPUB and Kindle. Book excerpt: Bridges are a vital component of the transportation network. Evaluating their stability and structural response after a flood event is critical to highway safety. Bridge studies are usually designed with an assumption of an open channel flow condition, but the flow regime can switch to pressure flow when the downstream edge of a bridge deck is partially or totally submerged during a large flood. Figure 1 shows a bridge undergoing partially submerged flow in Salt Creek, NE, in June 2008. Figure 2 shows a totally submerged flow in Cedar River, IA, in June 2008, which interrupted traffic on I-80. Unlike open channel flows, these pressure flows create a severe scourability potential because scouring the channel bed is one of the only ways to dissipate the energy when passing a given discharge in pressurized flow. Although most bridge scour events are due to live bed scour, a maximum scour depth often results from clear water flows with a critical approach velocity for bedload motion. For bridge safety, this report emphasizes the equilibrium maximum scour of pressure flows in extreme clear water conditions. The objectives of the study were to collect a detailed high-quality dataset of pressure flow scour at a model bridge and to develop an analytical solution for pressure flow scour based on mass and energy conservation laws. To these ends, existing results in the literature were reviewed, and knowledge gaps were identified. Next, a series of flume experiments were conducted to examine the existing methods and test new hypotheses on bridge pressure flow scour. After, bridge flows were divided into three cases, and the mass and energy conservation laws were applied to each case, leading to hypotheses for pressure flow scour predictions. The hypotheses were tested with the flume data. In this report, an example procedure for calculating the maximum scour depth and scour profile is presented along with recommended research needs.

Failed Bridges

Author : Joachim Scheer
Publisher : John Wiley & Sons
ISBN 13 : 343360097X
Total Pages : 345 pages
Book Rating : 4.4/5 (336 download)

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Book Synopsis Failed Bridges by : Joachim Scheer

Download or read book Failed Bridges written by Joachim Scheer and published by John Wiley & Sons. This book was released on 2011-08-24 with total page 345 pages. Available in PDF, EPUB and Kindle. Book excerpt: Gilt immer noch, dass ein Bauwerkseinsturz der beste Lehrmeister für den Fortschritt des Bauens ist? Oder, anders formuliert: Ist Bauen dann, wenn wir das Bewährte verlassen und Neues wagen, "Experimentieren"? Über die Ursache von Schadensfällen und Einstürzen, die oft mit dem Verlust von Menschenleben verbunden sind, wird nicht gern öffentlich gesprochen. Aber aus Fehlern kann man lernen. Die Lehren und Erfahrungen aus den Schadensauswertungen führen zu mehr Sicherheit und oft zum Innovationsschub. Die Kenntnis der Schadensursachen ist Voraussetzung für ihre zukünftige Vermeidung. Mit diesem Buch liegt eine systematische Zusammenstellung von über 400 Versagensfällen vor, die in besonderer Weise betrachtet werden: Sie werden nach dem Zeitpunkt ihres Auftretens im Lebenszyklus der Brücke, z. B. im Bauzustand oder im Betrieb, und nach den Schadensereignissen, z. B. Anprall oder Erdbeben, geordnet. Die wichtigsten Ursachen sind: menschliches Versagen, mangelnde Aussteifung, Materialversagen oder Überlastung. Es werden vorwiegend Brückeneinstürze, die in der Literatur wenig oder nach dem Urteil des Verfassers nicht vollständig oder nicht zutreffend behandelt sind, ausführlich analysiert. Mit Akribie gesammelt, kompetent und exzellent aufgearbeitet und mit Mut präsentiert, ergibt dies eine unverzichtbare Erkenntnisquelle für jeden Bauingenieur in der Praxis und für das Studium. Ein Katalog von Regeln wurde erstellt. Seine Beachtung kann helfen, Fehler bei Entwurf, Planung und Ausführung zu vermeiden.

Probabilistic Flood Loss Assessment for Bridge Infrastructure Subjected to Scour

Author : Michael Kern
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (138 download)

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Book Synopsis Probabilistic Flood Loss Assessment for Bridge Infrastructure Subjected to Scour by : Michael Kern

Download or read book Probabilistic Flood Loss Assessment for Bridge Infrastructure Subjected to Scour written by Michael Kern and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Scour is the erosion of soil surrounding a bridge foundation. It is the leading cause of bridge failure in the United States. Pennsylvania's poor bridge infrastructure and its susceptibility to flooding compound to form a detrimental relationship that exacerbates the impact of scour. After establishing the importance of scour estimation, a deterministic approach to estimate a bridge's failure probability due to scour using FEMA's HAZUS Flood software for hydrologic, hydraulic, and damage estimation is outlined. To incorporate the various factors of uncertainty that are not addressed in the deterministic approach, a probabilistic methodology using inundation maps for hydrologic analysis, Manning's equation for hydraulic analysis, and the HEC-18 pier scour equation for damage analysis is presented. A limit state function is established to define failure. The deterministic and probabilistic approaches' results are compared for a study centered around the PA-39 Swatara Creek bridge in Dauphin County, PA. It is found that the probabilistic estimation generally estimates a larger failure probability, and is effective over a greater range of peak flood flow rate values. Climate change's increase on future flood peak flow rates and its impact on scour are briefly discussed.

Bridge Collapse Frequencies versus Failure Probabilities

Author : Dirk Proske
Publisher : Springer
ISBN 13 : 331973833X
Total Pages : 129 pages
Book Rating : 4.3/5 (197 download)

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Book Synopsis Bridge Collapse Frequencies versus Failure Probabilities by : Dirk Proske

Download or read book Bridge Collapse Frequencies versus Failure Probabilities written by Dirk Proske and published by Springer. This book was released on 2018-02-22 with total page 129 pages. Available in PDF, EPUB and Kindle. Book excerpt: This monograph provides a comparative study between failure probabilities and collapse frequencies in structural bridge engineering. The author presents techniques to resolve and extend the limitations of both parameters, taking also into account the time dependency of both parameters. The book includes available data and case studies and thus presents patterns to identify potential weaknesses and challenges in bridge maintenance. The target audience primarily comprises practicing engineers in the field of bridge engineering, but the book may also be beneficial for academic researchers alike.

Manual on Scour at Bridges and Other Hydraulic Structures

Author : Amanda Kitchen
Publisher :
ISBN 13 : 9780860179399
Total Pages : 62 pages
Book Rating : 4.1/5 (793 download)

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Book Synopsis Manual on Scour at Bridges and Other Hydraulic Structures by : Amanda Kitchen

Download or read book Manual on Scour at Bridges and Other Hydraulic Structures written by Amanda Kitchen and published by . This book was released on 2021 with total page 62 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Risk Assessment of Highway Bridges Under Multi-hazard Effect of Flood-induced Scour and Earthquake

Author : Taner Yilmaz
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (915 download)

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Book Synopsis Risk Assessment of Highway Bridges Under Multi-hazard Effect of Flood-induced Scour and Earthquake by : Taner Yilmaz

Download or read book Risk Assessment of Highway Bridges Under Multi-hazard Effect of Flood-induced Scour and Earthquake written by Taner Yilmaz and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Natural disasters may have significant impact on the functionality of highway transportation systems resulting in unacceptable socio-economic losses. Flood and earthquake hazards can be considered as two most significant natural threats to safety of bridges. The overarching need for safety and serviceability of critical transportation infrastructure system requires highway bridges to be analyzed and designed not only for discrete hazard events, but also for possible multiple-hazard (or multi-hazard) conditions. For a highway network spanning over a seismically-active flood-prone region, the occurrence of earthquakes in the presence of flood-induced scour is a possible multi-hazard scenario for bridges in the network. The varied dynamic characteristics of a bridge due to the occurrence of scour may affect the response of the bridge under earthquake loading, and eventually may increase the risk of bridge failure.Despite the rising concern of research communities on this topic, the issues related to the multi-hazard effect of flood-induced scour and earthquake on highway bridges have not been satisfactorily answered. In addition, no guideline is currently available in design codes to ensure seismic safety of bridges with potentially scoured foundations. This dissertation aims to improve a comprehensive knowledge-base on risk and reliability analyses of highway bridges subjected to this multi-hazard by developing a multi-hazard risk assessment framework for bridges and quantifying variability in multi-hazard fragility and risk of bridges through a thorough uncertainty analysis. Outcome of this research provides research communities and government agencies a better understanding of the multi-hazard effect of flood-induced scour and earthquake on the risk and reliability of highway bridges. It also serves as a foundation for future researches on developing strategic plans for repair or retrofit prioritization for highway bridges under similar multi-hazard conditions.

Submerged Flow Bridge Scour Under Clear Water Conditions

Author : U.s. Department of Transportation
Publisher : CreateSpace
ISBN 13 : 9781508810827
Total Pages : 56 pages
Book Rating : 4.8/5 (18 download)

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Book Synopsis Submerged Flow Bridge Scour Under Clear Water Conditions by : U.s. Department of Transportation

Download or read book Submerged Flow Bridge Scour Under Clear Water Conditions written by U.s. Department of Transportation and published by CreateSpace. This book was released on 2015-03-10 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt: Pressure flow (also known as vertical contraction) scour occurs when a bridge deck is insufficiently high such that the bridge superstructure becomes a barrier to the flow, causing the flow to vertically contract as it passes under the deck. A bridge deck is considered partially submerged when the lowest structural element of the bridge is in contact with the flowing water but the water is not sufficiently high to overtop the bridge deck. It is considered fully submerged when a portion of the flow overtops the bridge deck. Pressure flow generally only occurs in extreme flood events, but these types of events are relevant for estimation of scour. When flow is sufficiently high so that it begins to approach the elevation of the bridge deck, some of the flow may be diverted laterally to the bridge approaches. Since the bridge approaches are often lower than the bridge deck, this diversion may reduce the scour potential under the bridge. Designers must evaluate the effects of scour under the bridge as well as potential damage caused by flow diversion. An experimentally and numerically calibrated scour model was developed in this study to calculate the maximum clear water scour depth in non-cohesive bed materials under different deck inundation conditions. The theoretical formulation of the model is based on the conservation of mass of the water passing underneath the bridge deck. Particle image velocimetry (PIV) measurements and computational fluid dynamics (CFD) simulations were used to validate assumptions used in the derivation and verify calibration of parameters included in the scour model. As one of the important parameters in the pressure flow scour model, the separation zone thickness in the bridge opening was formulated analytically, calibrated experimentally, and verified by PIV and CFD analyses. The maximum scour depth was calculated by identifying the total bridge opening that resulted in the average velocity in the opening that is equal to the critical velocity of the bed material. This report summarizes a literature review on pressure scour and describes the physical and theoretical foundation for the model formulation. The newly collected flume data as well as PIV and CFD analyses are summarized. The model formulation is refined, tested, and compared to other approaches used to estimate pressure scour. Recommendations for model application are also provided.

Bridge Scour and Stream Instability Countermeasures

Author :
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (127 download)

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Book Synopsis Bridge Scour and Stream Instability Countermeasures by :

Download or read book Bridge Scour and Stream Instability Countermeasures written by and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Risk-based Strategies for Bridge Maintenance

Author : Khaled M. Mahmoud
Publisher :
ISBN 13 : 9781032638270
Total Pages : 0 pages
Book Rating : 4.6/5 (382 download)

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Book Synopsis Risk-based Strategies for Bridge Maintenance by : Khaled M. Mahmoud

Download or read book Risk-based Strategies for Bridge Maintenance written by Khaled M. Mahmoud and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Effective maintenance of bridge structures comprises a broad spectrum of plans for repairs and services implemented to enable bridges to perform their intended function. These include in-depth inspection, fatigue analysis, design of mitigation measures and construction to avert component deterioration. Several incidents of in-service and under construction bridge failures have recently taken place. These dramatic failures emphasize the importance of risk-based inspections and analysis of real-life data to evaluate reliability of bridges. To effectuate benefits of reliability analysis in bridge maintenance, work on theoretical reliability must be equipped with practical analytical tools. Such an approach must underscore risk elements and identify processes to manage risk and avoid unexpected outcomes of failures and service disruption of bridges. The devastating earthquakes of February 6, 2023, in the southern region of Turkey near the northern border of Syria, which claimed tens of thousands of lives, caused enormous structural damage and staggering economic losses. These seismic events brought to focus on the vitality of instilling infrastructure routes that must accommodate emergency management plans to integrate the influx of medical and rescue response teams. The safe operation of bridges along these routes is indispensable for mobilization and deployment of rescue teams, medical personnel, humanitarian assistance, and the supply of food and water. The reliability of access routes and bridges is defined by their ability to adequately function as planned to effectuate emergency management plans, in the event of a similar seismic event, anywhere in the world. Risk-Based Strategies for Bridge Maintenance contains selected papers presented at the 11th New York City Bridge Conference (New York City, USA, 21-22 August 2023), and discusses issues of reliability, risk assessment, management, maintenance, inspection, monitoring, design, preservation, and rehabilitation of bridges. The book is aimed at bridge engineers.

Bridge Failure Rates, Consequences, and Predictive Trends

Author : Wesley Cook
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (9 download)

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Book Synopsis Bridge Failure Rates, Consequences, and Predictive Trends by : Wesley Cook

Download or read book Bridge Failure Rates, Consequences, and Predictive Trends written by Wesley Cook and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A database of United States bridge failures was used to ascertain the failure rate of bridge collapses for a sample population with associated rates by causes. By using the National Bridge Inventory bridge counts, the bridge population, from which the collapsed bridge came from, was determined. The average number of bridge collapses based on the sample population was approximately 1/4,700 annually. The geometric distribution was determined to be a valid model for the number of bridge failures per annum through multiple methods. Based on the data extrapolation and 95% confidence interval, the estimated average annual bridge collapse rate in the United States is between 87 and 222 with an expected value of 128. The database showed hazards that have caused bridges to collapse historically, throughout the United States. Conditional probabilities of collapse rate with consideration for the features under the structures were constructed. The most likely cause of collapse was determined to be hydraulic in nature when adjusting for the features under the structure. The collapse rate of hydraulic causes was unknown from past investigations; however, the value was determined to be an annual rate of 1.52E-4. Collapse rates were also quantifiably established for other causes. The consequences coupled with the rate of failure by cause were quantitatively evaluated. A benchmark, set by the United States Army Corps of Engineers interim guideline for dam safety, was used to show that bridge collapses within the United States are within a tolerable range comparing collapses to life loss. To enhance risk-based and data-driven approaches to bridge management systems in compliance with Moving Ahead for Progress in the 21st Century Act, efficacious bridge collapse data collection is examined for this investigation. Trends obtained from statistical analysis of existing data show 53% of collapsed bridges were structurally deficient prior to collapse, and a failure rate of structurally deficient bridges to be 1/1,100 annually. Age and structural deficiency are related, structural deficiency and collapse are related, and age at collapse is contingent on collapse cause. It was determined that deterioration-caused and overload-caused bridge collapses are age related, but hydraulic-caused and collision-caused bridge collapses are not. Based on the desired results, trends seen in existing collapse data, improved collection efforts and data fields of interest are assessed with recommendations for analytical methods and consequence assessment while maintaining concise data. A national repository of bridge collapses at the federal level is paramount for effective bridge collapse risk analysis. Currently, bridge failure data is incomplete and insufficient to enable in-depth lifetime data analysis for improved bridge preservation. However, the frequency of collapses is often enough for large amounts of data to be collected in relatively few years.

Multi-hazard Resilience Assessment of River-crossing Bridges

Author : Mostafa Badroddin
Publisher :
ISBN 13 :
Total Pages : 234 pages
Book Rating : 4.:/5 (122 download)

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Book Synopsis Multi-hazard Resilience Assessment of River-crossing Bridges by : Mostafa Badroddin

Download or read book Multi-hazard Resilience Assessment of River-crossing Bridges written by Mostafa Badroddin and published by . This book was released on 2020 with total page 234 pages. Available in PDF, EPUB and Kindle. Book excerpt: Bridge structures are required to possess high reliability and robustness against the concurrent effect of extreme loads and environmental attacks. To achieve such interrelated goals, it is necessary to assess the system performance and resilience subjected to multi-hazard impacts and the beneficial effects of any retrofitting or hazard-countermeasure in a lifecycle context. The damaged bridge needs to be restored rapidly over its service life due to the significant economic losses and disruption to transportation networks. For river-crossing bridges, one of the essential hazard mitigation strategies is scour countermeasures. However, a quantitative understanding of the effects of SCs on bridge system resilience is not found. This dissertation presents a critical synthesis of the existing literature that provides relevant knowledge and a profound understanding of probabilistic multi-hazard assessment for bridge structures. Then, a finite element-based probabilistic framework is designed to assess the lifecycle resilience of reinforced concrete river-crossing bridges under seismic, flood-induced scour, and chloride-induced corrosion impacts, including the consideration of a typical scour countermeasure at variable service times. Based on the general performance-based approach, two probabilistic models are formulated, termed the mean-scour fragility analysis (MS-FA) model and the total-scour demand hazard analysis (TS-DHA) model, which produce straightforward functional curves and can be readily used to evaluate the seismic-scour multi-hazard effects. An integrated damage index is defined based on both local and system-level ductility demands to develop a demand hazard model and to estimate the damage-based residual functionality and recovery duration to quantify the lifecycle bridge resilience. Notably, the exceeding probability approach is designed to reveal how progressive and sudden hazards interact and result in resilience degradation and how scour countermeasures contribute to resilience enhancement. The outcomes of the numerical experiment reveal the positive and distinct effects of implementing SCs at different lifecycle intervals. More importantly, resilience time-series demonstrate arbitrary multi-modes and nonparametric patterns. Accordingly, a robust statistical distance-based approach is presented to determine the sequential evolution of time-varying multi-hazard resilience. The proposed framework would assist stakeholders and decision-makers in resilience patterns recognition, assessing the effectiveness of hazard mitigation strategies, and taking short- and long-term proactive intervention actions by specifying resilience thresholds.

Guide for Response Planning, Assessment, and Rapid Restoration of Service of Bridges in Extreme Events

Author : Andre R. Barbosa
Publisher :
ISBN 13 : 9780309709712
Total Pages : 0 pages
Book Rating : 4.7/5 (97 download)

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Book Synopsis Guide for Response Planning, Assessment, and Rapid Restoration of Service of Bridges in Extreme Events by : Andre R. Barbosa

Download or read book Guide for Response Planning, Assessment, and Rapid Restoration of Service of Bridges in Extreme Events written by Andre R. Barbosa and published by . This book was released on 2024 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Extreme events resulting from natural or other disasters, such as fires, floods, earthquakes, tornados, and hurricanes, can damage bridge structures in ways that impact the safety of motorists and the public. The procedures currently employed for response planning, assessment, and rapid restoration of service of these structures to maintain safety do not always address the full range of needs for personnel, communication, coordination, data collection, assessment levels, and other factors associated with the different types and extents of these events. NCHRP Research Report 1098: Guide for Response Planning, Assessment, and Rapid Restoration of Service of Bridges in Extreme Events, from TRB's National Cooperative Highway Research Program, provides information and guidance on all aspects of response planning, assessment, and rapid restoration of service of bridge structures in extreme events."--Publisher's website.