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Design Standards 6000 Series Retaining Walls

2011 FDOT/FTBA CONSTRUCTION CONFERENCE. Design Standards 6000 Series Retaining Walls. Gevin McDaniel, P.E. Senior Structures Design Engineer FDOT Structures Design Office. Major Factors Influencing the Changes:.

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Design Standards 6000 Series Retaining Walls

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  1. 2011 FDOT/FTBA CONSTRUCTION CONFERENCE Design Standards 6000 SeriesRetaining Walls Gevin McDaniel, P.E. Senior Structures Design Engineer FDOT Structures Design Office

  2. Major Factors Influencing the Changes: • Relocation and restructuring of the Retaining Wall Selection Process which was previously contained within the Plans Preparation Manual and now located within the appropriate Structures Office publications. • Pending development of Design Standards for additional retaining wall systems such as Segmented Block Walls • Added Precast Traffic Railing/Coping option • Redesign of the Junction Slab based on NCHRP Report 663 • Extend the use of the Junction Slab combinations to additional wall types FLORIDA DEPARTMENT OF TRANSPORTATION - STATE CONSTRUCTION OFFICE

  3. DCE Memo 01-11 • Released on January 6, 2011 • Provides a brief summary of major changes • Contains a “map” linking the old Index numbers to the new Index numbers FLORIDA DEPARTMENT OF TRANSPORTATION - STATE CONSTRUCTION OFFICE

  4. Why New Index Numbers?2010 Design Standards Index Organization (Disorganization): • Sound Barriers and retaining walls are completely different systems • Gravity Walls? • Index 520 • Sheet Pile Walls? Index 20400 Series • Where should we add new systems? • Solution: Consolidate & reorganize FLORIDA DEPARTMENT OF TRANSPORTATION - STATE CONSTRUCTION OFFICE

  5. New Index 6000 Series Organization: As shown on the current Interim Design Standards webpage • All wall types have been grouped together • The 6000 Series is now ready to accept additional wall types • Content of 6100 and 6200 Series, previously • applicable to only Permanent MSE Walls in Index 5300, now applicable to all wall types FLORIDA DEPARTMENT OF TRANSPORTATION - STATE CONSTRUCTION OFFICE

  6. Precast Traffic Railing/Coping: Contractor’s Option as shown in Index 6110 • Minimum Length of each segment = 12 ft. (may be longer, but consider shipping and horizontal geometry) • Optional widening & extension (“inside leg”) • 2” cover (no slip-forming) results in a top dimension of 8 ¾” FLORIDA DEPARTMENT OF TRANSPORTATION - STATE CONSTRUCTION OFFICE

  7. Precast Traffic Railing/Coping: Precast-to-CIP Transition No special treatment required since this is on the non-traffic face of the railing. FLORIDA DEPARTMENT OF TRANSPORTATION - STATE CONSTRUCTION OFFICE

  8. Precast Traffic Railing/Coping: Bar Extensions Possible damage to rebar at critical location Beneficial to use for bracing Avoid if possible Preferred FLORIDA DEPARTMENT OF TRANSPORTATION - STATE CONSTRUCTION OFFICE

  9. Precast Traffic Railing/Coping: Stability is Contractor’s Responsibility Optional inside leg slightly shifts the c.g. of the section and may provide additional stability FLORIDA DEPARTMENT OF TRANSPORTATION - STATE CONSTRUCTION OFFICE

  10. Precast Traffic Railing/Coping: Stability is Contractor’s Responsibility When optional leg is used with thinner walls, a larger void should be filled with Expanded Polystyrene to hold in position. Expanded Polystyrene is not to be considered as contributing to the stability of the section. FLORIDA DEPARTMENT OF TRANSPORTATION - STATE CONSTRUCTION OFFICE

  11. Precast Traffic Railing/Coping: Stability is Contractor’s Responsibility For 8” thick walls, the optional inside leg may be more beneficial. The c.g. of the precast section is within the middle third of the wall and leg provides a fairly snug fit. Ensure that any slope on the back face of the wall does not interfere with the inside leg. FLORIDA DEPARTMENT OF TRANSPORTATION - STATE CONSTRUCTION OFFICE

  12. Precast Traffic Railing/Coping: Stability is Contractor’s Responsibility 1 ½” max. dimension ensures adequate lap splice length with junction slab rebar. FLORIDA DEPARTMENT OF TRANSPORTATION - STATE CONSTRUCTION OFFICE

  13. Precast Traffic Railing/Coping: Stability is Contractor’s Responsibility For walls having widths greater than 8”, the use of the inside leg is no longer an option unless a special design is submitted. FLORIDA DEPARTMENT OF TRANSPORTATION - STATE CONSTRUCTION OFFICE

  14. Redesign of Junction Slab:Savings Comparison • Redesigned based on NCHRP Report 663 • Savings of 43% in concrete volume of Junction Slab and Coping FLORIDA DEPARTMENT OF TRANSPORTATION - STATE CONSTRUCTION OFFICE

  15. Redesign of Junction Slab:Additional Comparisons FLORIDA DEPARTMENT OF TRANSPORTATION - STATE CONSTRUCTION OFFICE

  16. Redesign of Junction Slab:Reason for strengthening connection to Junction Slab Discontinued Precast Traffic Railing/Junction Slab FLORIDA DEPARTMENT OF TRANSPORTATION - STATE CONSTRUCTION OFFICE

  17. Redesign of Junction Slab:Drainage Inlet Openings Index 6201 Allow for 6” width increase around drainage structures to accommodate the 1’-0” edge beam Minimum of 20’ CIP Traffic Railing (10’ each side) FLORIDA DEPARTMENT OF TRANSPORTATION - STATE CONSTRUCTION OFFICE

  18. Redesign of Junction Slab:Raised Sidewalk Old Section New Section Change to the Raised Sidewalk is limited to the sidewalk thickness and reinforcing FLORIDA DEPARTMENT OF TRANSPORTATION - STATE CONSTRUCTION OFFICE

  19. Redesign of Junction Slab:Optional C-I-P Junction Slab Keyway If soil compaction is not achievable within 6” of the top of the wall, provide a C-I-P keyway as shown FLORIDA DEPARTMENT OF TRANSPORTATION - STATE CONSTRUCTION OFFICE

  20. C-I-P Cantilever Retaining Walls: Utilize the Traffic Railing/Junction Slab in lieu of direct attachment to wall Old Detail New Detail Bars G3 and Bars N have been removed from Data Tables Use of Junction Slab: reduces damage to the wall; allows other traffic railing shapes. FLORIDA DEPARTMENT OF TRANSPORTATION - STATE CONSTRUCTION OFFICE

  21. C-I-P Cantilever Retaining Walls: Utilize the Traffic Railing/Junction Slab in lieu of direct attachment to wall The Structures Design Office is currently evaluating details to re-establish an alternative for direct attachment. FLORIDA DEPARTMENT OF TRANSPORTATION - STATE CONSTRUCTION OFFICE

  22. Gravity Walls: Increased Clear Cover to allow for use within all environmental classifications Old Section New Section FLORIDA DEPARTMENT OF TRANSPORTATION - STATE CONSTRUCTION OFFICE

  23. What happened to Calcium Nitrite requirements? • The Department has conducted research in which Calcium Nitrite has not shown significant benefit in the prevention of corrosion to justify its cost • Manufacturers/Contractors will choose either silica fume, metakaolin, or ultrafine fly ash when required in the Plans (located in the notes of the Data Tables) Example Note: FLORIDA DEPARTMENT OF TRANSPORTATION - STATE CONSTRUCTION OFFICE

  24. New Estimated Quantities Tables:Conveniently located within Data Tables • Example of New Permanent MSE Wall Quantities Table • Example of New Temporary MSE Wall Quantities Table FLORIDA DEPARTMENT OF TRANSPORTATION - STATE CONSTRUCTION OFFICE

  25. Specification Section 548 effective July 2011 • For Retaining Wall Systems covered by this Section, the following information has been relocated from the Design Standard to the Specification: 1. QPL Acceptance Criteria 2. Shop Drawing Requirements • Other changes have been made to the Specification FLORIDA DEPARTMENT OF TRANSPORTATION - STATE CONSTRUCTION OFFICE

  26. Other Changes to Look for: • Revised Data Tables • New Data Tables • Revised Notes • New Notes FLORIDA DEPARTMENT OF TRANSPORTATION - STATE CONSTRUCTION OFFICE

  27. Other Changes to Look for: Well... Just About Everything… FLORIDA DEPARTMENT OF TRANSPORTATION - STATE CONSTRUCTION OFFICE

  28. Can I use these new Design Standards on existing projects under construction? Contacts: Rodney Chamberlain Steve Plotkin FLORIDA DEPARTMENT OF TRANSPORTATION - STATE CONSTRUCTION OFFICE

  29. Heads up • 2012 Design Standards to be published in electronic form only (web based PDF) • Options for self-printing will be available • Design Standards Website changes coming soon to improve user interface • New Design Standards release schedule will be 1-year cycle • No more Interims! (at least from the Structures Office) FLORIDA DEPARTMENT OF TRANSPORTATION - STATE CONSTRUCTION OFFICE

  30. Thank You! Gevin J. McDaniel, P.E. Senior Structures Design Engineer FDOT Structures Design Office 605 Suwannee Street, MS-33 Tallahassee, FL 32399-0450 Phone: (850) 414-4284 FLORIDA DEPARTMENT OF TRANSPORTATION - STATE CONSTRUCTION OFFICE

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