abc policy development iowa dot
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Norman McDonald, PE Iowa Department of Transportation Office of Bridges and Structures. ABC Policy DEVELOPMENT Iowa DOT . Mid-continent transportation research symposium Structures/construction session 2d august 15, 2013. Iowa’s ABC Experience. - PowerPoint PPT PresentationTRANSCRIPT
ABC POLICY DEVELOPMENTIOWA DOT
Norman McDonald, PEIowa Department of Transportation
Office of Bridges and Structures
MID-CONTINENT TRANSPORTATION RESEARCH SYMPOSIUMSTRUCTURES/CONSTRUCTION SESSION 2D
AUGUST 15, 2013
Iowa’s ABC ExperienceDevelop skills and design details through demonstration projects Invest in research with laboratory and field testing to confirm constructability and performance. Participate in national pooled fund studies Involve local construction industry and hold ABC workshops.
ABC Policy Development
Goal is to create a statewide policy to determine when ABC should be used.Assembled a team of engineers from Project Delivery Bureau, Districts, Research, and FHWA along with representatives from Highway Division Management Team (HDMT). Also included industry representatives.Goal was to have a draft by July 2012
ABC Policy DevelopmentConducted a survey of State DOTs Collected and reviewed all available policiesDiscussed the development of the policy with other states, FHWA staff, and national experts at various conferences and workshopsCollaborated with neighboring states and hosted a regional policy forumVisited a State DOT with established experience in ABC
ABC Policy
The Iowa ABC policy utilizes two decision making tools :–ABC Rating Score & Flow Chart similar to
Utah as a first level filter–AHP Decision Making Tool as a second
level confirmation and further evaluation of alternatives.
Calculate ABC Rating Score
First-Stage Filter: Use First-Stage Decision Making Flowchart
Second-Stage Decision Making: Use the ABC AHP Tool
Project Delivery Concurrence
Develop ABC Concept Alternative(s) and Estimate Costs
Develop Traditional Alternatives and Costs
Concept Team Recommended Alternatives
Concept Selection and Statewide Prioritization
Yes
Yes
No
Determine Tier of Acceleration OBS recommends ABC options based on Tier of Acceleration MDT reviews OBS recommendations
Yes
No
No
ABC Decision Process Flowchart
ABC Rating Score Concept Measures
Measures are limited to data that are readily available in NBI database and can be programmed to calculate a Rating Score: Average Annual Daily Traffic (AADT)Out-of-Distance Travel (miles)Daily Road User CostsEconomy of Scale (total number of spans)
Average Annual Daily Traffic (AADT)
Use a value equal to the total number of vehicles on the bridge plus 25% of the AADT for any roadways under the bridge.0 No traffic impacts1 Less than 50002 5000 to less than 10,0003 10,000 to less than 15,0004 15,000 to less than 20,0005 20,000 or more
Out-of Distance Travel(miles)
This is a measure of the impact that a project has on vehicles when the construction site is closed to traffic. 0 No detour1 Less than 52 5 to less than 103 10 to less than 154 15 to less than 205 20 or more
Daily Road User CostsIs the measure of daily financial impact of a construction project on the traveling public. Major contributing factors are out of distance travel (OOD) and AADT on the bridge. The standard method used for calculating user costs is the formula:
DRUC=(AADT+2xADTT)xOODxMileage RateThe mileage rate is currently set at 37.5 cents per mile. Truck traffic (ADTT) is counted at three times the amount of other traffic.
Daily Road User Costs0 No user costs1 Less than $10,0002 $10,000 to less than $50,0003 $50,000 to less than $75,0004 $75,000 to less than $100,0005 $100,000 or more
Economy of Scale(number of spans)
Accounts for the repetition of elements and processes, and how they relate to cost, as well as possible savings to future projects. Number of spans is used to account for repetition of substructure elements and superstructure elements.0 1 span1 2 or 3 spans2 4 or 5 spans3 6 spans or more
Measures Score Weight Factor
Weighted Score
Maximum Score
Weighted Maximum Score
Average Annual Daily Traffic 5 10 50 5 50
Out of Distance Travel 2 10 20 5 50
Daily Road User Costs 4 10 40 5 50
Economy of Scale 2 5 10 3 15
Total Score 120 Max Score 165
ABC Rating Score (Total Score/Max Score)x100= 73
ABC RATING SCORE FACTORS AND WEIGHTS
4
11
33
22
10
35
5
0 0 00
5
10
15
20
25
30
35
40
ABC Rating Score Distribution
Number ofState Bridge
Replacements(Total = 120)
ABC Rating Score Distribution for State Bridge Replacements in Iowa for 5 year Plan (2013 to 2017)
0 to < 10
10 to < 20
20 to < 30
30 to < 40
40 to < 50
50 to < 60
60 to < 70
70 to < 80
80 to < 90
90 to 100
ABC Rating Score Distribution0
200
400
600
800
1000
1200
445
505
970
771
274
1008
48 3212 7
ABC Rating Score Distribution for State Bridges in Iowa
0 to < 1010 to < 2020 to < 3030 to < 4040 to < 5050 to < 6060 to < 7070 to < 8080 to < 9090 to 100
Number ofState Bridges(Total = 4072)
Calculate ABC Rating Score
First-Stage Filter: Use First-Stage Decision Making Flowchart
Second-Stage Decision Making: Use the ABC AHP Tool
Project Delivery Concurrence
Develop ABC Concept Alternative(s) and Estimate Costs
Develop Traditional Alternatives and Costs
Concept Team Recommended Alternatives
Concept Selection and Statewide Prioritization
Yes
Yes
No
Determine Tier of Acceleration OBS recommends ABC options based on Tier of Acceleration MDT reviews OBS recommendations
Yes
No
No
ABC Decision Process Flowchart
ABC Rating ScoreLess than 50
Perform ABC AHP Analysis for Second-Stage Decision Making
Use Traditional Construction
ABC Rating Score50 to 100
Does the Project Concept Team want the
project to undergo further ABC evaluation?
No
Yes
YesDoes the project support an ABC approach based
on OBS, District, and possibly others’
evaluation?No
YesDistrict requests further review for
ABC?
No
Yes
Yes
No
No
First-Stage Decision Making Flowchart
Calculate ABC Rating Score
First-Stage Filter: Use First-Stage Decision Making Flowchart
Second-Stage Decision Making: Use the ABC AHP Tool
Project Delivery Concurrence
Develop ABC Concept Alternative(s) and Estimate Costs
Develop Traditional Alternatives and Costs
Concept Team Recommended Alternatives
Concept Selection and Statewide Prioritization
Yes
Yes
No
Determine Tier of Acceleration OBS recommends ABC options based on Tier of Acceleration MDT reviews OBS recommendations
Yes
No
No
ABC Decision Process Flowchart
AHP Criteria Organization
19
Criteria A decision maker can insert or eliminate
levels and elements as necessary to sharpen the focus on one or more parts of the analysis. Less important criteria and sub-criteria can be dropped from further consideration.
New Sub-Criteria
AHP Analysis Details Comparisons between criteria and between sub-criteria are performed using data from actual measurements or using a qualitative scale.
9 8 7 6 5 4 3 2 987654321
9 8 7 6 5 4 3 2 987654321
9 8 7 6 5 4 3 2 987654321
Direct Costs
Direct Costs
Site Constraints
Indirect Costs
Schedule Constraints
Direct Costs
AHP Analysis Details Comparisons are also used to assess the extent to which one alternative satisfies a
criteria over another alternative.Alt B
9 8 7 6 5 4 3 2 987654321
9 8 7 6 5 4 3 2 987654321Alt A
Alt A
Alt B
Direct Costs
Indirect Costs
23
Results
Calculate ABC Rating Score
First-Stage Filter: Use First-Stage Decision Making Flowchart
Second-Stage Decision Making: Use the ABC AHP Tool
Project Delivery Concurrence
Develop ABC Concept Alternative(s) and Estimate Costs
Develop Traditional Alternatives and Costs
Concept Team Recommended Alternatives
Concept Selection and Statewide Prioritization
Yes
Yes
No
Determine Tier of Acceleration OBS recommends ABC options based on Tier of Acceleration MDT reviews OBS recommendations
Yes
No
No
ABC Decision Process Flowchart
Calculate ABC Rating Score
First-Stage Filter: Use First-Stage Decision Making Flowchart
Second-Stage Decision Making: Use the ABC AHP Tool
Project Delivery Concurrence
Develop ABC Concept Alternative(s) and Estimate Costs
Develop Traditional Alternatives and Costs
Concept Team Recommended Alternatives
Concept Selection and Statewide Prioritization
Yes
Yes
No
Determine Tier of Acceleration OBS recommends ABC options based on Tier of Acceleration MDT reviews OBS recommendations
Yes
No
No
ABC Decision Process Flowchart
Calculate ABC Rating Score
First-Stage Filter: Use First-Stage Decision Making Flowchart
Second-Stage Decision Making: Use the ABC AHP Tool
Project Delivery Concurrence
Develop ABC Concept Alternative(s) and Estimate Costs
Develop Traditional Alternatives and Costs
Concept Team Recommended Alternatives
Concept Selection and Statewide Prioritization
Yes
Yes
No
Determine Tier of Acceleration OBS recommends ABC options based on Tier of Acceleration MDT reviews OBS recommendations
Yes
No
No
ABC Decision Process Flowchart
Calculate ABC Rating Score
First-Stage Filter: Use First-Stage Decision Making Flowchart
Second-Stage Decision Making: Use the ABC AHP Tool
Project Delivery Concurrence
Develop ABC Concept Alternative(s) and Estimate Costs
Develop Traditional Alternatives and Costs
Concept Team Recommended Alternatives
Concept Selection and Statewide Prioritization
Yes
Yes
No
Determine Tier of Acceleration OBS recommends ABC options based on Tier of Acceleration MDT reviews OBS recommendations
Yes
No
No
ABC Decision Process Flowchart
Calculate ABC Rating Score
First-Stage Filter: Use First-Stage Decision Making Flowchart
Second-Stage Decision Making: Use the ABC AHP Tool
Project Delivery Concurrence
Develop ABC Concept Alternative(s) and Estimate Costs
Develop Traditional Alternatives and Costs
Concept Team Recommended Alternatives
Concept Selection and Statewide Prioritization
Yes
Yes
No
Determine Tier of Acceleration OBS recommends ABC options based on Tier of Acceleration MDT reviews OBS recommendations
Yes
No
No
ABC Decision Process Flowchart
Calculate ABC Rating Score
First-Stage Filter: Use First-Stage Decision Making Flowchart
Second-Stage Decision Making: Use the ABC AHP Tool
Project Delivery Concurrence
Develop ABC Concept Alternative(s) and Estimate Costs
Develop Traditional Alternatives and Costs
Concept Team Recommended Alternatives
Concept Selection and Statewide Prioritization
Yes
Yes
No
Determine Tier of Acceleration OBS recommends ABC options based on Tier of Acceleration MDT reviews OBS recommendations
Yes
No
No
ABC Decision Process Flowchart
OBS ConcernsAdditional duties/assignments within OBS to perform ABC evaluation (i.e. AHP analysis)Additional time required for developing ABC design conceptsNeed to develop ABC design standards and policiesNeed to develop expertise to perform in-house ABC design or support/guide consultant design
OBS ConcernsAccuracy of estimating cost for new ABC concepts.Unknown long term performance of bridges constructed with ABC.Need for higher level of construction inspection.
ABC Implementation Challenges Funding to offset ABC construction cost – need to identify new revenues or alternative fundingResistance from some local contractors to ABC – working with industry to change the climate Limited contracting methods – since Design Build (DB) is not allowed in Iowa we are looking at the partial DB option
ABC Implementation Challenges Design aids – we are working on ABC design policies, specifications and standard details.Limited experience in ABC design – several ABC projects have been identified to attain experience for our engineers.
Questions?
Norm McDonaldDirector, Office of Bridges and StructuresIowa Department of [email protected]