HOAN BRIDGE REHABILITATION

Transcription

1 5/11/2013 HOAN BRIDGE REHABILITATION Presentation Overview Project Overview History Project Background In-Depth Inspection Structural Design Elements WSPE Discovery Conference 2013 PROJECT OVERVIEW Project Scope HISTORY 1

2 5/11/2013 Bridge to Nowhere local backlash against the Milwaukee County freeway system caused a delay in the completion of the connecting roadways. Thus, the Hoan sat there, unconnected from the rest of the highway system until 1977 when compromise was reached and it was connected at both ends and traffic began flowing across. 2

3 In the movies PROJECT BACKGROUND Project Background: Schedule Project Background: Traffic Control Strategies Hoan Bridge Painting: and 2017 painting will have minimal traffic impacts 15 MOVABLE BARRIER Project Background: Traffic Control Strategies Project Background: Stakeholder Coordination REVERSED RAMPS Given its location, many different entities are affected Summerfest Milwaukee Metropolitan Sewer District (MMSD) Port of Milwaukee Port of Milwaukee Tenants Shipping Industry Third Ward, Downtown, South Side Communities 3

4 5/11/2013 IN-DEPTH INSPECTION 4

5 5/11/2013 NORTH APPROACH: MULTI-GIRDER NORTH APPROACH: GIRDER-FLOORBEAMSTRINGER (GFS) SOUTH APPROACH: MULTI-GIRDER MAIN SPAN: ARCH SOUTH APPROACH: GIRDER-FLOORBEAMSTRINGER (GFS) PROJECT NOTATION PROJECT NOTATION Structure Types MULTI - GIRDER Typical Steel Framing Girders are ~5 FT Deep Typical Girder spacing is ~ 8 FT Structure Types STRINGER FLOORBEAM GIRDER FLOORBEAM STRINGER (GFS) Stringers: W21 at ~8 FT O.C. Floorbeams: W30 at ~20 FT O.C. Girders: 8ft Deep at ~24 FT O.C. GIRDER 5

6 5/11/2013 Structure Types ARCH SPAN ARCH RIB CABLE SUPPORTS Arch Rib: 4-0 x 5-0 Welded Steel Box Tie Girder: 4-0 x 14-0 Welded Steel Box TIE GIRDER Cable Supports: 2 ¼ Diameter, Groups of 4 Floor System: Stringers and Floorbeams Main Findings STRINGERS AND FLOORBEAMS Deck - Soffit Delamination, Spalls & Cracks Deck Riding Surface Overlay Patches Deck Gaps Unsealed Sliding Plate Joints 6

7 Deck - Parapets Shiplap Expansion Joints Multi-girder Units GFS Units Shiplap Expansion Joints Shiplap Expansion Joints - Bearings Main Span Stringers Heavy Corrosion Bearing Surface Pitting Paint Condition Paint Condition Typical Failed Coating Typical Field Splice Typical Shiplap Region Field Splice Pack Rust 7

8 Paint Condition Other Inspection Findings Main Span Floor Beam Tie Girder Field Splice Tie Girder Field Splice Leaks Cable Anchorages Inspection Access Inspection Access Inspection Access ENGINEERING ANALYSIS 8

9 Assessing Deterioration Analysis Software What and where 2010 In-depth inspection (GRAEF) What to apply Setting a threshold Steel approach structures: MDX Main Span / Arch: Midas How to apply Determining the best method to apply deterioration Approach Span Analysis Shiplap joints = hinges Influence of back spans Software limitations Approach Span Analysis Transfer Girders Load Transfer Distribution Factors Unit S16 Unit S15 Unit S14 80% of actual span length CL Bearing Cantilever Joint CL Bearing Cantilever Joint Arch Analysis Arch Analysis HIGH-LEVEL MODELING Model Verification Base 9

10 Arch Analysis Model Verification Beam Elements Arch Analysis Model Verification Rigid Links Arch Analysis Model Verification Element Forces Arch Analysis Model Verification 3D Arch Analysis Construction staging is key! Deck removal Deck pour 10

11 5/11/2013 Why Rehab? REHAB OVERVIEW Deck/parapets are poor condition Joints and supporting superstructure are deteriorated Paint system is failing Improve ratings Extend service life 11

12 Solutions: Rating Issues Make deck composite with girders and stringers Add shear stiffeners Replace sub-standard shiplap joints SHIPLAP JOINT REPLACEMNT Solutions: Deck Replacement High performance concrete Waterproof joints Stay-in-place forms Solutions: Painting Hoan Facts 3 Million Sq. Ft. of surface to paint Repainting Recycled Abrasive 3 coat system per DOT approved list Certified inspectors required 3 Million square feet of painting = 55 football fields 12

13 Hoan Facts 11 Million pounds of Rebar = 2,000 miles of #5 rebar Hoan Bridge to Los Angeles by car Hoan Facts 42,000 CY of concrete 90 Million cans of your favorite 12 ounce beverage Questions? Project History Lake Interchange Lake Interchange History Most structures were constructed to connect the Marquette Interchange to the Hoan Bridge Structures between Milwaukee River and Lake Interchange constructed Lake Interchange completed with construction of the E-W ramps to Lincoln Memorial Drive Project History Hoan Bridge Project History Hoan Bridge Hoan Bridge History Hoan Bridge History Hoan Bridge open to traffic Harbor Bridge constructed. (Now called the Hoan Bridge.) Netting installed over Summerfest Grounds Lake Parkway connected to south end of Hoan Bridge Temporary closure due to northbound bridge failure Netting installed over Jones Island Treatment Plant & deck repair on south end Additional deck repair work 13

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