Bridge Development Update

Transcription

1 Bridge Development Update Rebecca Curtis, PE Michigan Department of Transportation Bridge Management Engineer 2014 Michigan Bridge Conference

2 Bridge Development Update Load Rating Plan of Corrective Action Update Technical Assistance for Load Ratings Metric 14 MiBridge Update Scour Management Questions

3 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)

4 Load Rating Plan of Corrective Action Tier 1 Bridges without load ratings as of January 1 st, 2011 Due on December 31 st, 2012

5 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 31 st, 2014

6 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 31 st, 2016

7 Load Rating Plan of Corrective Action

8 Load Rating Plan of Corrective Action

9 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

10 Technical Assistance for Load Rating 2014 Plans 3 bridge rating workshops 4+ Webinars (starts April 3 rd ) The Basics Theory and Policy Output Reports Concrete Box Culverts Update CMP culvert spreadsheet Continued technical support and license facilitation

11 AASHTOWare Bridge Design & Rating User Group Meeting for software formerly known as Virtis/Opis Basic and/or advanced training included August 12 th and 13 th Park Place Hotel, Traverse City

12 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

13 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

14 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

15 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

16 Scour Management

17 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

18 Scour Management

19 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

20 Scour Management Scour countermeasures can be used to mitigate existing piers so they are no longer scour critical Source: FHWA

21 Scour Management Scour countermeasures can be considered in the design of abutments to mitigate local (abutment) scour Source: FHWA

22 Questions? Rebecca Curtis, PE Michigan Department of Transportation Bridge Management Engineer 2014 Michigan Bridge Conference

23 Bridge Field Services Update Michigan Bridge Conference March 19, 2014

24 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

25 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

26 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 (b) of 90/180 days to update the condition ratings.

27 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.

28 Accelerated Bridge Construction Workshop Workshop held December 9 th, 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.

29 Accelerated Bridge Construction Workshop Requires change in philosophy must think like a contractor during design Consider equipment capacities

30 Accelerated Bridge Construction Workshop Consider methods to accelerate construction

31 Accelerated Bridge Construction Workshop Bridge Slide Special Provision MDOT publications New section of the Bridge Design Manual

32 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

33 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

34 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

35 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 prequal category

36 Cofferdam Reviews

37 Cofferdam Reviews

38 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

39 Bulb-T Beam Implementation

40 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

41 Spliced Bulb-T, 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

42 Spliced Bulb-T, I-96 EB over US-23 SB

43 Spliced Bulb-T, I-96 EB over US-23 SB 90 Indiana Bulb Tee beams 7,500 psi concrete strength Eight lines of beams Longest Beam is Shortest beam is Longest segments is 139 (89 tons) Five PT ducts with 12 strands in each duct ( strands) Duct diameter is 3 3/8 (corrugated plastic duct) 2,600 kips of PT force per beam.

44 Spliced Bulb-T, I-96 EB over US-23 SB Stage 1

45 Spliced Bulb-T, I-96 EB over US-23 SB Stage 2

46 Spliced Bulb-T, I-96 EB over US-23 SB Stage 3

47 Spliced Bulb-T, I-96 EB over US-23 SB Stage 3

48 Lodge Freeway Retaining Walls

49 Lodge Freeway Retaining Walls

50 Lodge Freeway Retaining Walls

51 Lodge Freeway Retaining Walls

52 Lodge Freeway Retaining Walls

53 Lodge Freeway Retaining Walls

54 Bridge Approach Details (Sleeper Slabs)

55 Bridge Approach Details (Sleeper Slabs)

56 Bridge Approach Details (Sleeper Slabs)

57 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

58 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.

59 Bridge Deck BOHIM Revised

60 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

61 Bridge Deck BOHIM Revised Texturing and curing bridge decks Exemptions to two hour limit on placement of burlap Reference to A to change this as necessary in cold weather conditions to accommodate additional curing time Cold weather protection clarification

62 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

63 FS Advisories

64 BFS Vertical Under- Clearance Superstructure/Bridge replacement Roadway grade changes Beam repairs

65 BFS 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

66 BFS 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

67 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: _Steel_Sheet_Piling_and_Cofferdams

68 Zilwaukee Bridge SB complete NB to begin March 25, 2014

69 US-131 over Muskegon River

70 look forward working with u all again this son Thank you Questions?