Presentation on theme: "Best Practices for Bridge Management and Inspection"— Presentation transcript:
1 Best Practices for Bridge Management and Inspection Jeremy Shaffer, Ph.D. InspectTech Systems
2 Outline Overall Goals/Purpose Bridge Inspection Basics and RequirementsDetails of ApproachesBridge ManagementNeeds/ApproachesExamplesUtilizing technology to improveConclusionsQuestions
3 Goals for Bridge Inspection and Management Ensure optimal safety and operational capability in the most efficient manner.Inspection is used as the eyes/ears of the program to find and document the current condition including any problemsManagement utilizes the inspection data along with the organization’s priorities to determine the most efficient way to ensure goals are met (i.e. safety, performance, capacity)
4 High-Level Current State of Affairs Aging InfrastructureHigh Construction and Maintenance CostsTighter BudgetsData Overload on OwnersNew RegulationsBigger Need + Fewer Resources = ?No room for errors or wasted efforts
5 Need for Inspections Regulations/Laws Liability New FRA requirementsState/Intl. specific lawsLiabilityInsurance or bond requirementsBest Practice for MaintenanceMuch cheaper to fix problems early than laterSustaining Reliable Operations
6 Types of Inspection Visual Inspections Primary typeCusory, In-Depth, Special, etc.Performed yearly (most locations)Identify overall conditions and areas for additional explorationAdvanced Technology for Detailed DataNDE/NDT approachesDestructive testingOn-going monitoring/sensors
7 Inspection Requirements Often driven by disasters; some examples related to highway bridgesSilver Bridge Collapse 1967Mianus River Bridge Collapse 1983Schohaire Creek Bridge Collapse 1987Hoan Bridge Failure 2000I-35W Bridge Collapse 2007When disaster happens, new rules can come quickly
8 Critical Parts of Inventory/Inspection Inventory of all Bridges/CulvertsNeed to know what is there and basic propertiesGeometric data, material informationDrawings/Plans (with all repairs/rehabs)Condition data on all structuresCurrent informationPast information
9 Inspection Condition Data Quantification via a Rating ScaleNeed to be able to compare relative conditions within a structure and between structuresSubjective results via Narrative TextNeed to be able to have descriptions indicating the scope and nature of the condition
10 Supporting Information PicturesDigital pictures for overall inventory and every deficiencyVideosCan be appropriate to show time based effects of live loads or multiple anglesSketches/DrawingsTest/Sensor ResultsBoring information, Stress readings
11 Level of DetailLevel of detail of inspection data can vary greatly from entity to entityMinimum requirements can be less than 1 page per bridgeSome entities collect over pages per bridge.
12 Level of Details Span by Span vs Entire Structure Can inspect and rate every span and pier individuallyCan group similar spans and rate as a group (ex:approaches, main span, approaches)Entire structure as a single entity
13 WMATA Inspection Program Structures are divided into primary sub-parts (Abutments/Piers, Spans, CrossBox, etc.)Forms are unique for the type of the sub-component (i.e. Steel Box Girder vs. Concrete Box Beam)Multiple inspectors work on the same bridge independently, rolled up to bridge summary of all parts.
15 Component or Element Level Inspection Detailed Component Level: track conditions and problems to specific main components (specific: bearing: joint, or chord)Element Level: Quantify specific elements of the structures (i.e. superstructure steel) and specify the exact amount in different condition states
19 Detailed Inspection Example (Individual Bearings)
20 Importance of QA/QCStudies have shown results from visual inspections can vary significantly by inspectorHaving detailed review process is highly recommended to help ensure accuracy of results obtainedInaccurate results can lead to poor decisions via bad prioritization and/or wasted effortCommon approach is to spot-check 5-10% of structures and/or critical components
21 Bridge Management Basics Few entities have unlimited funds. Setting and developing priorities is an important function of bridge managers.Bridge funding must be justified against other priorities.The options available for management can be limited by extent and detail of current and past information availableDeterioration and trade-off modeling possible with extensive details
22 Bridge Management Basics Maintaining and monitoring a scheduled maintenance activities program for a bridge can significantly extend service life“An ounce of prevention is worth a pound of cure” – Ben FranklinWould you drive your car and never change the oil? Do we effectively do that with many bridges?
23 Bridge Management Need a repository of all bridge data Tools Easily accessible (from multiple locations)Searchable format to quickly find dataAll current/past dataToolsMaintenance Need PrioritizationBudgeting and Capital PlanningVisualization via Mapping/CAD
24 Risk Based ManagementRisk Based Management takes into account the multiple variables/objectivesExample of two part metricLikelihood of FailureConsequence of FailureCan weight different factors based on importancei.e.: Safety, Capacity, Detour length, Cost
25 Individual Maintenance Needs Tied to Risk (Example)
26 Life Cycle CostingImportant to Consider Overall Life Cycle Cost of decisions from design to repairsOften lower initial cost leads to much greater costs over timeExample: A slightly cheaper design may save $20,000 initially but cost $150,000 more over a 100 year life-cycle in greater inspection and maintenance costs
27 Plans of ActionPlans of Action develop a predefined series of actions that should be takenEvent BasedFloods (level exceeds certain threshold)Seismic (over certain magnitude)Time BasedEvery 5 years do an Underwater InspectionEvery 10 years re-inventory all data
28 Utilizing Software to Assist Inspections generate a large amount of text and file based dataIdeal for software to assist in collecting and managingAllows information to be easily searchable and retrievable
29 Benefits of Computerized Inspections Eliminate mistakes during the transcription processAbility to integrate in detailed manuals and error checksEasy incorporation of pictures and other attachmentsOne-click generation of reportsField/Office data entry options
30 Benefits of Computerized Management Ability to instantly retrieve all informationCurrent and PastText and PicturesMaintenance needs and actionsPrioritize based on desired metrics/variablesIntegrated Mapping/VisualizationStandard or ad-hoc report generation
31 Many Reporting Options Estimated Remaining Service Life
33 Visualization (CAD)Increasing use to allow for detailed location and easy visualization of any problem
34 CAD Details 3D Solid Model or 2D plan views Represent only the details that user cares aboutUtilize color for different layers – condense to single color for search resultsAbility to turn on/off layersInformation all driven off database and web-interface
35 Many Possible Tools but Remember Purpose To ensure a safe and reliable infrastructure for customers/users.To protect the investment into the infrastructure by detecting structural problems before they deteriorate to the point where they create unsafe conditions or threaten operations.
36 Conclusions Inspections form the foundation of a good bridge program Active management is important to the most efficient use of fundsSoftware can significantly improve the ongoing management of bridge data and provide useful tools for engineers