Rebecca Curtis, PE Michigan Department of Transportation ...

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)


Tier 1

Bridges without load ratings as of January 1st, 2011 Due on December 31st, 2012


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


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

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

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

Bridge Field Services Update

Michigan Bridge ConferenceMarch 19, 2014

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 Consider methods to accelerate construction

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

Cofferdam Reviews

Cofferdam Reviews

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



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 SB

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.


Stage 1


Stage 2


Stage 3


Stage 3

Lodge Freeway Retaining Walls






Bridge Approach Details (Sleeper Slabs)



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

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 Advisories

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

Zilwaukee Bridge

SB complete NB to begin March

25, 2014

US-131 over Muskegon River

To begin summer 2014

Thank you

Questions?

e look forward working with

ou all again this ason

Rebecca Curtis, PE Michigan Department of Transportation ...

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