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Deficiencies, Needs. H. Scott Matthews January 22, 2003. Recap of Last Lecture. Grant (95) summarized condition ratings of many parts of built infrastructure Data seemed to indicate big problems, but did not necessarily give us information on the extent of problems

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deficiencies needs

Deficiencies, Needs

H. Scott Matthews

January 22, 2003

recap of last lecture
Recap of Last Lecture
  • Grant (95) summarized condition ratings of many parts of built infrastructure
  • Data seemed to indicate big problems, but did not necessarily give us information on the extent of problems
  • There were some missing pieces
deficiency ratings bridges
Deficiency Ratings - Bridges
  • Dunker & Rabbat (Dunker 95)
  • Same general idea as Grant, but with more detail and data refs (e.g., NBI)
  • NBI used as information source to U.S. Congress to justify spending
  • States can use own system, but must report in form usable by NBI
  • Ratings subjective, but follow a given and preset scale
  • Shows coding guide and inspection rules
areas of concern
Areas of concern
  • Structural Deficiency (SD) - has been restricted to light loads, or is closed, or requires immediate work to stay open
  • Functionally obsolete (FO) - one of several design parameters no longer meets usual criteria for system
geographical differences
Geographical Differences
  • Unlike Grant, Dunker separates bridge problems into ownership
  • See spread of SD and FO across national -> locally maintained bridges
  • And by bridge material (e.g. concrete)
  • Let’s look at NBI website
needs assessment
Needs Assessment
  • Concept of ‘need’ used casually
  • Can refer to both ‘need’ for repair as well as ‘need’ for new capacity
  • It is difficult to judge how much infrastructure a region or a society ‘needs’ and how ‘need’ is measured
    • Economic viability? Growth?
  • What is a better approach?
approach to defining needs
Approach to Defining Needs
  • From NCPWI 1986 - needs considers:
  • Consumer Demand
  • Recognition that demand changes
  • Consumer willingness to pay
  • Benefit-cost analysis
other issues on needs
Other Issues on Needs
  • Instead of focusing on conditions, establish future investment priorities
  • Instead of simply finding cost to repair, consider cost of alternatives with same effect
  • Consider infrastructure ‘output’ as measure instead of condition
  • Funding needs to match area of influence, e.g. federal money for federal interests
more issues
More Issues
  • Needs assessments should distinguish:
  • Safety or structural defects
  • Capacity shortages
  • Upgrading to new standards
  • Current and future demands
life cycle cost analysis lcca
Life Cycle Cost Analysis (LCCA)
  • A ‘life cycle’ is the entire length of time from design, planning, construction, operation, maintenance, and decommissioning/demolition
  • It is important to understand the cost implications of design decisions across the life cycle
  • Also important to understand where in the life cycle that total costs occur
life cycle cost influences
Life Cycle Cost Influences

Cum.

Cost

Level of Influence

100%

50%

Increasing Expenditure

0%

Planning

Decreasing Influence

Design

Construction

Maintenance

Disposal

Time

related topic service life
Related Topic: Service Life
  • Physical service life is the length of time which a piece of infrastructure is able to be kept in useful service
    • Depends on all life cycle phases
    • Can be extended from original design due to rehabilitation or preventive maintenance
expected service life estimates
Expected Service Life Estimates
  • Airport Buildings - 150 yrs
  • Runways - 50 yrs
  • Bridge Decks - 50
  • Bridge Sub-/superstructure - 125
  • Tunnels - 200
  • Sports Complexes - 300
  • Electricity/telephone lines - 400
  • Any comments?

Source: Hudson, Haas, Uddin

homework 1 due next wed
Homework 1 - due next Wed
  • Any questions?
  • Next class: design-service life and obsolescence
  • Read Lemer (1996)
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