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Bridge Development Update
Rebecca Curtis, PEMichigan Department of TransportationBridge Management Engineer
2014 Michigan Bridge Conference
Bridge Development Update
Load Rating Plan of Corrective Action Update Technical Assistance for Load Ratings Metric 14 MiBridge Update Scour Management Questions
Load Rating Plan of Corrective Action
What are the major points of the Load Rating PCA?
Tiered Deadlines for Load Ratings Three Tiers Deadlines every two years Continuing Compliance Checks (Metric 13)
Load Rating Plan of Corrective Action
Tier 1
Bridges without load ratings as of January 1st, 2011 Due on December 31st, 2012
Load Rating Plan of Corrective Action
Tier 2
Local Agency Tier 2 is comprised of bridges in poor condition
Load Ratings must be reviewed or updated to account for the poor condition
Tier 2 Load Ratings are due on December 31st, 2014
Load Rating Plan of Corrective Action
Tier 3
Local Agency Tier 3 is comprised of bridges with load rating inconsistencies Proper rating method based on year of construction or
reconstruction Load posting inconsistencies
Tier 3 Load Ratings are due on December 31st, 2016
Technical Assistance for Load Rating
Bridge Load Rating Program Support with MTU Center for Technology and Training
2013 Accomplishments User Needs Survey Camelback bridge tutorial, CMP culvert spreadsheet,
SHV analysis Over 68 technical assistance cases Processed 68 license requests
Technical Assistance for Load Rating
2014 Plans 3 bridge rating workshops 4+ Webinars (starts April 3rd) The Basics Theory and Policy Output Reports Concrete Box Culverts
Update CMP culvert spreadsheet Continued technical support and license facilitation
AASHTOWare Bridge Design & Rating
User Group Meeting for software formerly known as Virtis/Opis
Basic and/or advanced training included
August 12th and 13th
Park Place Hotel, Traverse City
Metric 14 – Inspection Procedures, Post or Restrict Metric 14
Rating less than 100% legal loads and still open Posting recommended Rating less than 3 Tons and open without restrictions
At this time last year, there were 183 bridges with postings recommended
Metric 14 – Inspection Procedures, Post or Restrict MDOT will check data monthly for possible Metric
14 compliance issues Safety issues must be addressed as soon as
possible Inventory must be addressed within 180 days for
Local Agency structures
MiBridge Update
MBIS and MBRS were combined into one system National Bridge Element Inspection is in place Highlights of future planned development Add remaining element level inspection items Compliance dashboard Request for Action dashboard Call for Projects dashboard Performance Report dashboard
Scour Management
FHWA Stewardship Agreement Goal Mitigate or reduce the number of interstate scour
critical bridges, using risked-based selection procedures, by 5 percent each year.
MDOT 426 scour critical bridges
Local agencies 1331 scour critical bridges
Scour Management
Interactive Risk Assessment Spreadsheet Created to prioritize mitigation efforts Data-driven risk assessment Adds weighted factors to water crossing bridges to
quantify vulnerability and criticality Provided local agency focused version to CRAM
Scour Management
MDOT Scour Committee is working to update guidance on design, coding, and plans of action for scour critical bridges Updating coding guidance (Item 113) Will reflect changes in HEC-23
Scour Management
Scour countermeasures can be used to mitigate existingpiers so they are no longer scour critical
Source: FHWA
Scour Management
Scour countermeasures can be considered in the design of abutments to mitigate local (abutment) scour
Source: FHWA
Questions?
Rebecca Curtis, PEMichigan Department of TransportationBridge Management Engineer
2014 Michigan Bridge Conference
Outline 2013 FHWA 23 Metrics Audit ABC Workshop Steel Fabrication Timeline Temporary Earth Retaining Structure Workshop Bulb T Beams Lodge Freeway Retaining Walls Bridge Approach Details Bridge Deck BOHIM (revised) 2013 BFSA Advisories
Vertical underclearance Revised MDOT Construction Manual
FHWA 23 Metrics 2013 Audit 13 of 23 Metrics determined to be fully compliant Plans of Corrective action required for:
METRIC 6 – Inspection Frequency, Routine, LOW Risk
METRIC 7 – Inspection Frequency, Routine, HIGH Risk
METRIC 10 – Inspection Frequency, Fracture Critical METRIC 11 – Inspection Frequency – Frequency
Criteria METRIC 13 – Inspection Procedures, Load Rating METRIC 14 – Inspection Procedures, Post or Restrict METRIC 15 – Inspection Procedures, Bridge Files METRIC 16 – Inspection Procedures, Fracture
Critical Members METRIC 20 – Inspection Procedures, QC/QA METRIC 21 – Inspection Procedures, Critical
Findings
FHWA 23 Metrics 2013 Audit METRICs 6, 7, 10, and 11 – MDOT will develop
and implement a statewide policy to require all inspection reports to be entered into to the bridge management database within thirty (30) days of completing the field portion of the inspection for all types of inspections.
This will allow MDOT to start the process of verifying timeliness earlier and as a result reduce the number of inspection that are more than (1) month late and eliminate inspections that are more than (4) months late . This policy exceeds FHWA’s regulation 23 CFR 650.313(b) of 90/180 days to update the condition ratings.
FHWA 23 Metrics 2013 Audit METRICs 13, 14 and 15 – Currently part of
the Load Rating corrective action plan.
Metrics 16, 20 and 21 – PCA involves development and implementation of Michigan Bridge Inspection Reference Manual, which MDOT Bridge Field Services is in the process of creating. Draft sections are complete pending reviews from Region Bridge Engineers. Local agency will also be engaged in reviews.
Accelerated Bridge Construction Workshop Workshop held December 9th, 2013
175 participants (MDOT, local agencies, consultants, industry)
Presentations from contractors, consultants, states (Utah) and ABC experts
Focus on specialized work such as structural moves and prefabricated elements
Future workshops will be coordinated.
Accelerated Bridge Construction Workshop Requires change in philosophy – must think
like a contractor during design Consider equipment capacities
Accelerated Bridge Construction Workshop MDOT publications
New section 7.01.19 of the Bridge Design Manual
Bridge Slide Special Provision
Steel Fabrication Timelines Plate Girders with flange thicknesses less than
3 inches, and rolled beams = 26 weeks after award
Provide sufficient time in letting for fabrication of steel beams Up to 3 months for rolling, and material delivery
from mill to fabricator Up to 1 month for RFI and shop drawing review
and approval Up to 2 months for fabrication and delivery to
project site
Steel Fabrication Timelines Variables that effect fabrication timelines
Fabricator chosen by contractor may have less work or greater production capacity
Some fabricators make book their production schedules in late winter/early spring
Mill order and other milestones may take equal time whether it includes one or both stages
The relationship of the contractor and fabricator
Steel Fabrication Timelines New BOHIM to be released, which will
included MITA and fabricator input
Information will also be included in the Construction Manual Wiki
Please consider interim completion, or interim open to traffic dates in your progress schedule when building steel beam bridges
Cofferdam Reviews Working with Geotechnical Services to
ensure all cofferdam and temporary sheeting plans and calculations are reviewed, and provide comments to field office.
Developing and Temporary Earth Retaining Structures design and construction workshop, and prequalcategory
Bulb-T Beam Implementation
MDOT Bridge Committee currently working through implementation plan for prestressed Bulb-T beam
Many states including Texas, Nebraska, Washington, Indiana and Wisconsin already use prestressed Bulb-T’s
Bulb-T Beam Implementation
Benefits High load carrying capacity More efficient fabrication Improved stability during handling and
transport Shallower depths per span length –
increased underclearance Reduction in overall costs
Spliced Bulb-T, I-96 @ US-23 First use of spliced bulb-T on MDOT project Single span, 181 ft long Temporarily supported, Post-Tensioned
with closure pour (UHPC) Post-Tensioning SP from Muskegon project,
with Bulb-T fabrication SP
Spliced Bulb-T, I-96 EB over US-23 SB90” Indiana Bulb Tee beams7,500 psi concrete strengthEight lines of beamsLongest Beam is 181’-8”Shortest beam is 161’-10”Longest segments is 139’ (89 tons)Five PT ducts with 12 strands in each
duct (12-0.6” strands)Duct diameter is 3 3/8” (corrugated plasticduct)2,600 kips of PT force per beam.
Bridge Approach Details (Sleeper Slabs) 12” minimum (36” max) Agg base or
Open Graded Drainage Course (OGDC) under sleeper slab
6” x 1’6” cut below backwall/abutment connection for joint waterproofing and drain installation
Geotextile separator used only with OGDC
Bridge Approach Details (Sleeper Slabs) Agg base compacted to 98%, OGDC
compacted per Special Provision 30’ cut to prevent settlement of slab during
construction 20’ approach typical
Independent backwalls may have shorter approaches based on expansion over the wall.
Site restriction may require shorter approaches.
Bridge Deck BOHIM Revised Emphasized debris clean-up prior to pour Epoxy coated steel touch-up Bridge deck pour sequence Bridge deck haunches Change in night casting pay items
No adjustments to “super concrete, night casting” or “Super Conc, Form Finish and Cure, Night Casting
Bridge Deck BOHIM Revised Texturing and curing bridge decks
Exemptions to two hour limit on placement of burlap
Reference to 104.01.A to change this as necessary in cold weather conditions to accommodate additional curing time
Cold weather protection clarification
Rigid Overlays Concerns regarding thickness of Silica Fume
Modified Concrete(SFMC) overlays More than 6” becomes troublesome and
creates risk of cracking Working with CFS Materials to create
alternatives to SFMC. Anticipated (design) depths
< 4” = SFMC 4”-6” = Grade D slag cement with 26A > 6” = Grade D slag cement with 6AA
BFS 2013-03 Vertical Under-Clearance Superstructure/Bridge replacement Roadway grade changes Beam repairs
BFS 2013-03 Vertical Under-Clearance Clearance signs to be present for all
vehicular structures with under-clearance of 16’0” or less.
Measurements taken 2’ off edge of pavement
Sign will indicate 2” less than actual measurement to accommodate live load deflections
BFS 2013-03 Vertical Under-Clearance Measurement included in Contractor
Staking Form 1190 Structure Clearance
Measurements to be completed Form 1120 Final Inspection/Acceptance
and Certification Report indicates clearance measurements taken
Contact Statewide Signs for assistance
Revised MDOT Construction Manual Division 7 has been re-written from the
ground up Construction Manual to be released in
Wiki format in April 2014 Sample of Section 704:
http://mdotwiki.state.mi.us/construction/index.php/704_-_Steel_Sheet_Piling_and_Cofferdams