Post-Extreme Event Damage Assessment and Response for Highway Bridges (2016) / Chapter Skim
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Pages 22-49
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22 ALASKA DEPARTMENT OF TRANSPORTATION & PUBLIC FACILITIES State Bridge Engineer The Alaska Department of Transportation & Public Facilities (ADOT&PF) has determined that earthquakes, scour, flood and debris flow, collision, ground acceleration, and liquefaction are all likely extreme events.
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23 It is through these interactions that they can maintain professional connections. Through these interactions a constant professional relationship is maintained and helps with the response arrangements in the event of an extreme event.
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24 During a flooding event: • Examine bridge for: – Loss of embankment material from under abutments (may form a void underneath approach pavement) – Loss of approach roadway.
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25 ing the capacity of the bridges and conducting shoring activities if needed. Yearly training consists of approximately 16 to 20 hours of earthquake inspection instruction and drills.
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26 sufficient data for bridge damage assessment after an extreme hydraulic event. FLORIDA DEPARTMENT OF TRANSPORTATION State Bridge Management Inspection Engineer In Florida, the most likely extreme events to cause bridge damage are over-height vehicle collisions and barge collisions in navigable waters.
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27 tractors, etc.)
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28 3.4. Upon arrival, approach the bridge with caution and never walk immediately directly under or over the bridge.
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29 Level 2 Inspection General Procedure 1. Start the inspection of the assigned bridge after collecting the necessary tools for the inspection.
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30 FIGURE 15 Initial emergency response flowchart.
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31 the public (through the media and signs) , marking a detour or approach, and signing the actual barricade closure.
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32 FIGURE 16 Detailed bridge assessment flowchart.
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33 a detailed inspection and assessment of the damage can be made and a load rating performed. This detailed assessment would be used to confirm the initial disposition of the bridge and then to initiate repair design and a contract for repairs.
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34 area during rush hour, lasts less than 30 minutes, and does not have a significant impact on traffic, then no Emergency Incident Notification is required. Otherwise, Level 3 notifications would be triggered by: • Any road or lane closure reported in a district with either short-term or local impacts.
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35 to bridges. During flood events, bridges and culverts are monitored.
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36 MnDOT has two bridges that have used fixed sonar as a part of a scour monitoring technology implementation research project. Prior to this project, MnDOT only used portable monitoring devices.
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37 These techniques were all used often after Hurricane Katrina. Of these, visual inspection is the most commonly used.
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38 Emergency Response Procedure MoDOT has an Incident Response Plan that is used to provide agency staff with a structured approach for responding to an emergency efficiently and effectively. The Incident Response Plan consists of topics such as continuity of operations plan, severe weather response plan, earthquake response plan, hazardous materials response plan, and terrorism response plan.
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39 FIGURE 19 Earthquake emergency highway routes.
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40 • Category D: Structures minimally at risk during major flood events. This category includes bridges on small drainage areas, low ADT roadways, and/or with minimal pile or footing exposure.
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41 Emergency Response Procedure NHDOT is working on being able to predict floods by using the information provided by its regional forecast center in Gray, Maine. NWS flood warnings are typically issued by county or by major river and watershed.
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42 4. Maintain a map and/or list of priority routes in the residency.
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43 16. Ensure that resources required for an earthquake response are ready for deployment at any time.
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44 25. Defer any communication with the media to the RD's designee.
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45 Structures Rapid Damage Detection Techniques Oregon DOT's most common form of damage detection is through visual inspection. Additionally, accelerometers, velocity meters, and NDT are used for damage detection.
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46 the affected area are to be completed within 24 hours of an extreme event. Although all structures in the affected area will be inspected, the importance of inspections will be considered in the following order: (1)
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47 and tracking critical structural and safety-related deficiencies on damaged structures (Figure 24)
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48 followed by earthquake, landslides, flood and debris flow, and over-height vehicle collisions. Structures Rapid Damage Detection Techniques WYDOT uses visual inspection as the primary approach for damage detection.
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49 Structures Rapid Damage Detection Techniques Los Angeles DOT uses visual inspection as its primary form of rapid damage detection. The agency also implements a system called ShakeCast, which is a software system used by the DOT to retrieve measured shaking data within minutes of an earthquake.
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