life cycle costing and port structures...pianc – marcom technical seminar, feb 05 12 design of...
TRANSCRIPT
Life Cycle Costing and Port Structures
Bruce LambertInstitute For Water Resources
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Objectives
What is Life Cycle ManagementHow to incorporate into current plansResearch challenges and sources for more information
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What is Life Cycle Costing
Avoiding unexpected system failure from negligent maintenance, budgeting or planning
Generally starts at preconstruction of a project, but can be incorporated anytime
Do you build what you want or what you can?How is this maintained?
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Challenge in Life Cycle Management for Infrastructure
Engineering Design Standards are basis-structures gauged on risk of structural “failure” or conditionLack of consistent inspection approachesEngineering standards for different components –mechanical versus structuralDifficult to test large structuresLong Design life – 50 -100 yearsHarshness of Marine EnvironmentStructure become technical obsolete before becoming physically obsolete
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Risks from Poor LCM
Port closuresRisk to structural integrity (loss of load bearing wharves, corrosion, collapse)Safety – injury or loss of lifeEnvironmental exposuresPotential liability issues
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A Generic System for Managing Port Structures
Goals Asset Inventory
Condition Assessment (Inspection) and
Performance Modeling
Alternatives Evaluation and Program Optimization
(rehabilitation –removal)
Short and Long Range Plans
Project Implementation(Construction)
Performance Monitoring (Operations)
Budget
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Implementing Life Cycle Costing During Planning/Construction
Determine required project needs and total costs over project cycleParameters to consider when costing
alternatives:Net Present ValueDetermine useful lifeLoss of Revenue from failure Maintenance costs Demolition or removal costsTax structures
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Inspection During Operation
Three approaches –Fix as fail Inspect and rehabilitate Preventive Maintenance
Inspection types and frequencyInitial design suggests inspection scheduleVisual inspection not always accurateBalance of other inspection types – costly and may not be preformed as frequently
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Implementation Challenges?
Projects have multiple uses Competing and changing interests - commitmentDetermining or guaranteeing a minimum standards for safe use or performancePlanning and defining current and future needsData integration – GIS and data warehousingProcess transparency must be developedEducation to port staff, commissioners and port users necessary
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Research gaps related to adopting life cycle management
Movement to more portable models and tools for end usersRecognition this is a data intense processExamine ways to reliability model condition assessmentsHow does system respond to extreme eventsNon-destructive inspection techniquesExamine recommendations for given repairsCan uncertainties by properly quantified?
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More Sources of Information
“Life cycle Management of Port Structures-General Principles” – Report of WG 31, Supplement to Bulletin 99 (1998)ASCE/AASHTO/FHWA/TRBJournal - “Structure and Infrastructure Engineering”PIANC – MarCom Technical Seminar, Feb 05
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Design of Movable Weirs and Storm Surge Barriers InCom WG 26 – Jan 2006
One of 6 goals – LCMTopics included design standards, costing structures, performance goals, and environmental considerationsEnclosed CD-Rom with appendix materials
Bruce LambertSenior Economist
Institute for Water ResourcesUS Army Corps of Engineers