Presentation on theme: "4/1/2017 3:01 AM FHWA Status Report - AASHTOWare Bridge Design/Rating User Group Meeting Virginia Beach, VA August 6-7, 2013 Thomas Saad, P.E. Senior."— Presentation transcript:
2 Outline Design and Analysis Tools Research LRFR Implementation WebinarsNew FHWA Design Manuals and Design ExamplesDesign and Analysis TrainingResearchLong-Term Bridge Performance Program (LTBPP)Policy and Regulatory IssuesNBIS UpdateNBI Coding Guide UpdateNTISEtc…
3 FHWA LRFR Webinar Series Topic No. 1: Implementation of the Load and Resistance Factor Rating Method, October 5, 2011Topic No. 2: LRFD/LRFR Design and Load Rating of Culverts, November 17, 2011Topic No. 3: LRFR Load Rating of Segmental Concrete Bridges, January 19, 2012Topic No. 4: State-Specific LRFR Load Rating Guidelines, April 19, 2012
4 FHWA LRFR Webinar Series Topic No. 5: Application of Load Testing in Bridge Load Rating (1), September 20, 2012Topic No. 6: Application of Load Testing in Bridge Load Rating (2), December 6, 2012Topic No. 7: Application of Computer Software in Bridge Load Rating (1), February 28, 2013Topic No. 8: Application of Computer Software in Bridge Load Rating (2), April 25, 2013Recordings:
5 LRFR Webinar No. 9: Load Rating of Steel Truss Bridges (1) September 12, 1:00 – 3:30 pm EDTFocus on evaluation of gusset platesNew gusset design/analysis provisionsGusset plate load rating methods case studyEvaluating deteriorated gusset plates
6 Other FHWA Design and Analysis Tools www.fhwa.dot.gov/bridge Steel Bridge Design Handbook – AvailableFatigue Repair and Retrofit Manual - AvailableRefined Analysis Manual – early 2014PT Box Girder Design Manual – early 2014FHWA PT Installation and Grouting Manual – release expected very soonManual on Engineering Stability in Construction of Bridge Superstructures – early 2014
7 FHWA/NHI Bridge Design and Analysis Courses (www.nhi.fhwa.dot.gov) NHI Course : LRFD for Bridge SuperstructuresNHI Course : LRFD for Bridge Substructures and ERSNHI Course : LRFR for Highway BridgesNHI Course : LRFD Seismic Analysis and Design of BridgesNHI Course : LRFD Seismic Analysis and Design of Tunnels, Walls and other Geotechnical FeaturesNHI Course : LRFD: Design and Analysis of Skewed and Horizontally Curved Steel Bridges
8 FHWA Seismic Retrofit Seminar 1 ½ day seminar (9 PDH)Overview of FHWA Seismic Retrofit ManualDevelop design response spectrum identically to current LRFDDelivered in IN, IL, NY, NJ, GA, MA, TN, UT
9 Seismic Design Category (zone) (500 year Return Period) Zone 1-SDC “A”Zone 2-SDC “B”Zone 3-SDC “C”Zone 4-SDC “D”Just showing accelerations isnt enough.We need to have the maps show seismic zones as well
10 Seismic Design Category (zone) (1000 Year Return Period) Zone 1-SDC “A”Zone 2-SDC “B”Zone 3-SDC “C”Zone 4-SDC “D”SITE CLASS “B”
11 Seismic Design Category (zone) (1000 Year Return Period) Zone 1-SDC “A”Zone 2-SDC “B”Zone 3-SDC “C”Zone 4-SDC “D”When EQ happened in Charelstion in 1886, it was felt in Boston, Chicago, and St Louis (900 miles away)SITE CLASS “D”
12 Seismic Design Category (zone) (1000 Year Return Period) Zone 1-SDC “A”Zone 2-SDC “B”Zone 3-SDC “C”Zone 4-SDC “D”SITE CLASS “E”
13 Long-Term Bridge Performance (LTBP) Program Definition of Bridge Performance:Bridge Performance Encompasses How Bridges Function and Behave Under the Complex and Interrelated Factors they are Subjected to Daily:Traffic VolumesLoadsDe-Icing ChemicalsFreeze-Thaw CyclesEnvironmentExtreme EventsMethod of DesignConstructionMaterialsAgeMaintenance History
14 Long-Term Bridge Performance (LTBP) Program Vision: The LTBP Program will Serve as the National Platform for Strategic Long-Term Investigation of In-Service Bridge Performance.Mission: Foster Improved Bridge Performance, Health, Stewardship, and Management Through the Analysis of Data Collected Over a 20-Year Period on a Large Representative Sample of U.S. Highway Bridges. To achieve this, the Program is Designed to Produce and Support Improved Deterioration Models, Reliable Life-Cycle Cost and Forecasting Models, Design Procedures, and Decision-Making Tools.
15 Virginia Bridge Testing CoringUSWImpact EchoGPRElectrical Resistivity
18 Long Term Bridge Performance Program “Robot”Remote controlledCamerasGPS4 NDE technologiesDeployed on 24 bridges3 high-resolution cameras capture holistic deck-surface images to show deck cracks, and the lengths and widths of the cracks as small as 1 millimeter. 360-degree images also can show the presence and condition of barriers, poles, curbs, and other surrounding hardware.GPS precisely tags condition data with exact location using global coordinates.Electrical resistivity device enables bridge inspectors to measure the level of corrosion within the deck.14 impact echo devices are a seismic or stress-wave technology that are used to find defects and anomalies in concrete such as delamination and debonding, including depth, spread, and severity.6 ultrasonic surface wave sensors are used to assess the quality and modulus of elasticity or strength of the concrete deck.GPR provides a qualitative condition assessment of the deck and can detect apparent or suspected deterioration such as delamination or corrosion. The system uses 32 dense array, ground-coupled antennas for high-spatial resolution.Integrates data into a 3-D visualization that shows the exact shape, width, depth, and location of damages.
20 NBIS Compliance Update Progress made nationally on 20 of 23 metrics1 metric stayed the same at 100% Satisfactory2 metrics re‐defined with no comparison availableSignificant improvement in 5 metrics3 frequency, scour POAs, QC/QACY 2011PY 2013% ChangeSatisfactory70.5 %79.3 %8.9 %Active Improvements29.0 %20.6 %(8.4 %)Unsatisfactory0.5 %> 0.08 %(0.42 %)Things are noticeably improving.Significant improvements in 5 metrics: CC to SC or C, and SC to C
21 NBIS Compliance Update FHWA/AASHTO Task Force in 2011Some metrics revised for 2012 assessmentsRemainder revised for current cycleIssued latest version of metrics on 4/1/13May training for FHWA staffRisk considerations, commentary, incorporated Q&AsMetrics for PY 2014 (upcoming review year)15 of 23 metrics were revised and sent out to Divisions on 4/1/2013
22 NBI Data QualityTrends show results of significant efforts to reduce errorsError = bad or missing data> 60 Million pieces of data in NBINumber of Errors2009201020112012115,81120,2846,9674,155Further clarification: Bad data includes values that are coded that are out of the range of assigned codes for a specific item, or data that does not pass certain reasonableness cross checks such as the bridge deck with curb to curb being larger than the bridge deck with out to out. We acknowledge that there are exceptions so some of these cross checks because of unusual structure configurations.Further clarification: Missing data is values that are not submitted for required items to be coded for highway bridges. A check is made that the bridge is a highway bridge before issuing an error. For instance if a pedestrian bridge is submitted we would not expect to see a functional classification or certain other information.
23 NBIS Video for Local Agencies Central online library of videos and resources for local agenciesEach video addresses a single topiccondenses complex regulations and requirements of the Federal-aid Highway Program into easy-to-understand concepts and illustrated examplesLaunched August 27, 2012 at the American Public Works Association (APWA) International Public Works Congress and Exposition
25 National Tunnel Inspection Standards (NTIS) SNPRM published in Federal RegisterComments due by September 30, 2013https://www.federalregister.gov/articles/2013/07/30/ /national-tunnel-inspection-standards#h-4TOMIE Manual atNational Tunnel Inventory and Coding Guide being developed
26 Asset Management System Primer MAP-21 requires AMS for NHS bridges and pavementsStates document how they will do businessState must define performance measures for bridges and pavementsPenalties if performance not met
27 NBIS Regulations Update Mandated by MAP-21Methodology, training, and qualifications for inspectorsFrequency of inspectionsThree years to complete (October 2015)
31 Compliance Oversight and Penalty Procedures MAP-21 mandatesProcedures for annual compliance reviewsPenalty for noncompliance with the NBISEstablishes timeframesStates notified of noncompliance concerns by Dec 31st45 days to resolve or establish a PCAImplement penalty if no PCA or resolutionFederal Register Notice being developed
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