BRIDGE MANAGEMENT, EVALUATION AND REHABILITATION. Idaho Transportation Department Matt Farrar

Transcription

1 BRIDGE MANAGEMENT, EVALUATION AND REHABILITATION Idaho Transportation Department Matt Farrar

2 Introduction Matt Farrar State Bridge Engineer for the Idaho Transportation Department Responsibilities include Bridge Design and Construction Support Bridge Management, Planning and Programming AASHTO SCOBS T 18 Bridge Management, Evaluation, and Rehabilitation Chairman

3 Bridge Inspection & Load Rating Experience

4 1978 BRIDGE INSPECTOR TOOLS

5 2011 NORTHWEST BRIDGE INSPECTION CONFERENCE AASHTO T 18 MANUAL FOR BRIDGE EVALUATION GUIDE MANUAL FOR BRIDGE ELEMENT INSPECTION

6 T 18 Update What is T 18? AASHTO SCOBS Subcommittee on Bridges and Structures 20 Technical Committees T 18 is the Technical Committee for Bridge Management, Evaluation, and Rehabilitation T 9 is the Technical Committee for Bridge Preservation T 14 is the Technical Committee for Steel Bridges

7 T 18 Update (Continued) T 18 Responsibilities Maintain and Update the Manual for Bridge Evaluation (MBE) Maintain and Update the NEW Guide Manual for Bridge Element Inspection

8 T 18 Update (Continued)

9 T 18 Update (Continued) Manual for Bridge Evaluation

10 T 18 Update (Continued) MBE SECTION 4 INSPECTION Types of Inspection Frequency Procedures Trusses Pin and Hangers Special Structures

11 T 18 Update (Continued) MBE SECTION 6 LOAD RATING LRFR ALLOWABLE STRESS & LOAD FACTOR RATING

12 T 18 Update (Continued) 2011 Manual for Bridge Evaluation Ballot Items 1. Article 2.4.3, New Article to introduce the AASHTO Guide Manual for Bridge Element Inspection into the Manual for Bridge Inspection 2. New Section 3, Complete revision to Bridge Management Systems Section in the Manual for Bridge Evaluation

13 T 18 Update (Continued) 2011 Manual for Bridge Evaluation Ballot Items ( continued) 3. Article C4.4.3, adds new commentary acknowledging that training and experience are essential for non engineer and engineer team leaders 4. Article 6A & 6B revises the way in which rivet shear capacity is determined

14 T 18 Update (Continued) What s in the future for the Manual for Bridge Evaluation? Provisions for Load Rating of Culverts and other buried structures with examples Updates to Sec. 5 Material Testing Updates to Sec. 7 Fatigue Evaluation Updates to Sec. 8 Nondestructive Load Testing

15 T 18 Update (Continued) AASHTO GUIDE MANUAL FOR BRIDGE ELEMENT INSPECTION

16 T 18 Update (Continued) AASHTO GUIDE FOR COMMONLY RECOGNIZED (CoRe) STRUCTURAL ELEMENTS

17 T 18 Update (Continued) AASHTO Guide Manual for Bridge Element Inspection

18 Significant Changes Four condition states for all elements. Follows Good, Fair, Poor, Serious convention. Wearing surfaces separated from deck element. Deck element units changed to square feet with multiple deterioration paths. Steel protective coatings separated from steel. All smart flags have been incorporated into condition state language. New elements for timber trestle and framed/built up tower supports.

19 Element Types National Bridge Elements (NBE s) Represent the primary structural components of bridges necessary to determine overall condition and safety. Includes all primary structural elements. Decks, Slabs, Girders, Columns, Abutments etc. Condition state language is not editable. Designed to remain consistent from agency to agency Minimal implementation level for non element inspection agencies.

20 National Bridge Elements

21 Element Types Bridge Management Elements (BME s) Elements define secondary bridge components. Joints, wearing surfaces, protective coatings,etc. Provide and added level of condition assessment for agencies utilizing bridge management systems. Can be extended to capture other components as desired by the agency. Can influence deterioration modeling.

22 Bridge Management Elements

23 Element Types Agency Developed Elements Supports agency developed elements. Require fours conditions states following general definitions. May be sub sets of NBE s or BME s. Sub sets of NBE s require same condition state language. Can be sub sets of BME s. May be unrelated to any defined element. May be subject to deterioration modeling or not. Allows the incorporation of non bridge assets.

24 Agency Developed Elements Sign Structures Beam Ends

25 CoRe Deck Element

26 CoRe Deck Element Example Numerous areas of delaminations and open spalls in the deck surface. Spans 2, 3, and 5 have heavy delaminations with asphalt and concrete patches. Approximately 60% or more of the deck is patched, spalled or delaminated.

27 Guide Deck Element Example 6000 sq ft 8000 sq ft

28 Guide Deck Element Example Element Commentary

29 CoRe Steel Painted Element

30 CoRe Steel Painted Element Example 624 ft 105 ft 312 ft Paint is off down to the bare metal. Areas where the paint has peeled at the joints has started to rust. There are small areas that have pitted.

31 Guide Steel Open Girder/Beam Element Example National Bridge Element 640 ft 417 ft

32 Guide Steel Open Girder/Beam Element Example ( continued) Bridge Management Element 16,000 sq ft 2000 sq ft sq ft 600 sq ft 400 sq ft

33 Questions and Answers Why change the elements? Goal of capturing all condition defects on the bridges. Provide the means for consistent detailed bridge condition information. Improve the deck and slab language to capture structural capacity and defects of these high maintenance items. Separate wearing surfaces and protective coatings out for management of these protection systems.

34 Questions and Answers Will retraining of our inspectors be required? The new elements build on a concept that they are familiar with, however some training will be required. Many of the changes in the new elements will appeal to the field inspectors and will be welcome improvements. The consistent four state model will provide for more standardized inspection from one element to the next.

35 Questions and Answers Will the new element manual impact the sufficiency rating? The new elements are not currently associated with the sufficiency rating and will have no impact on project eligibility or apportionment. What is the status of implementation of the new Guide Manual for Bridge Element Inspection?

36 Conclusion 1. Improvements to the Manual for Bridge Evaluation will continue so as to be a more useful tool to bridge inspections and load raters.

37 Conclusion ( continued) 2. Implementation and future revisions of the Guide Manual for Bridge Element Inspection will provide the States with an improved Bridge Management System.