2020 Chicago Lakefront Trail at NATIONAL AAAEA Navy Pier and Chicago River VIRTUAL CONFERENCE Nov. 13 & 14 Jamal Grainawi, P.E., S.E. Manager of Movable Bridges at WSP Presented at 2020 NATIONAL AAAEA VIRTUAL CONFERENCE November 14, 2020 AGENDA • Phase I –Segment I & II (North of the Chicago River) • Peer Review of Phase II – Segment I & II • Conceptual – Segment III (Over Chicago River) • Phase I – Segment III • Phase II – Segment III Slide 2 • Phase III – Segment III Construction Status PROJECT LOCATION Slide 3 Both are correct PROJECT LOCATION Slide 4 PROJECT LOCATION Slide 5 PROJECT LOCATION Slide 6 EXISTING CONDITIONS – AT NORTH END OF PROJECT AT JANE ADDAMS PARK Slide 7 EXISTING CONDITIONS – AT GRAND AVE Slide 8 EXISTING CONDITIONS – AT LOWER-LEVEL LSD Slide 9 EXISTING CONDITIONS – AT LOWER-LEVEL LSD Slide 10 EXISTING CONDITIONS – AT DUSABLE PARK Slide 11 PROPOSED SOLUTION Slide 12 Source: CDOT Presentation PROJECT AERIAL & ALIGNMENT Slide 13 PROJECT RENDERING Slide 14 Phase I Concepts Slide 15 Phase I Concepts Slide 16 Phase I Concepts Slide 17 PROJECT DEVELOPMENT REPORT COVER Slide 18 Computer Rendering of Flyover near Ohio St. Underpass PHASE II ARCHITECTURAL CONCEPTS Slide 19 PHASE II FINAL SECTIONS Slide 20 Completed Segment 1 Slide 21 Completed Segment 1 Slide 22 Completed Segment 1 Slide 23 Completed Segment 1 Slide 24 LSD BRIDGE OVER THE CHICAGO RIVER Slide 25 Existing Bridge and Its History Original Construction • Construction started in 1929 and finished in 1937 • It was the longest bascule when constructed: 264-feet • It was the widest bascule when constructed: 108-feet Original bridge with no traffic on lower level Slide 26 Slide 26 East elevation of the Lake Shore Drive Bascule Bridge (Bridges, viaducts, and underpasses: Lake St. Bridge through Ogden Slip Bridge, Image 9. (1971-1973). Copelin Commercial Photographers (James S. Parker Collection). Chicago - Photographic Images of Change, University of Illinois at Chicago. Library. Special Collections Department) CDOT BRIDGING THE DRIVE COMPETITION Slide 27 The Need to Widen the Trail at the Bridge Slide 28 Project Location Navy Pier Flyover Segment III Segments I & II Concept & Preliminary Design Concept How can the new widened hinged sidewalk improve on the proven 1980s solution? Phase I Study Can the end be supported or seated on the main bascule leaf? Slide 29 Can it be fully or partially balanced? Preliminary Design Iterative design solutions Introduction of locking mechanisms EXISTING CONDITIONS – AT N. APPROACH LSD BRIDGE Slide 30 EXISTING CONDITIONS – AT N. APPROACH LSD BRIDGE Slide 31 EXISTING CONDITIONS – AT N. TOWER- LSD Slide 32 EXISTING CONDITIONS – AT N. TOWER LOOKING NORTH – LSD BRIDGE Slide 33 EXISTING CONDITIONS – AT N. TOWER LOOKING NORTH – LSD BRIDGE Existing opening was ~8-ft at bridge houses Slide 34 RENDERING – AT N. TOWER LOOKING NORTH – LSD BRIDGE - FROM PHASE I Additional >8’ opening added in bridge houses The Need to Widen the Trail at Slide 35 the Bridge More Work than a Trail Widening EXISTING CONDITIONS – AT S. APPROACH LSD BRIDGE Slide 36 EXISTING CONDITIONS – AT S. APPROACH LSD BRIDGE Slide 37 EXISTING CONDITIONS – INSIDE S. TOWER OF LSD BRIDGE Slide 38 Innovating on a Validated Solution Slide 39 Existing Bridge and Its History 1980s Modification HSS 10x10 with 3” diameter pin into a pillow block bearing Cantilevered (each side) W12 support framing Slide 40 1980s hinged sidewalk, closed position 1980s hinged sidewalk, fully-open position, ~75deg Concept Design Phase I Study Original hinged sidewalk • Type, Size and Location (shadow behind) Plans were approved in October 2013 12 10 8 • Phase I study completed in April 2014 Slide 41 • Concept for hinged sidewalk similar to existing with addition, but with the addition of counterweight Anchor at outer two girders frame Counter- Longitudinal joint weight Concept Design Phase I Study A widened sidewalk (trail) will now clash with bridge house Slide 42 This section was added to moving piece 1980s hinged sidewalk, fully open at Closer view of 1980s hinged sidewalk, NE Bridge House fully open at NE Bridge House Concept Design Phase I Study Moving hinged sidewalk allows for navigation clearance to remain Railing would hit house at full open Slide 43 Preliminary Design Slider Crank Mechanism Modifications: Horizontal Guide Link Arm 1. Double Link Arm Rail 2. Slider Rail 3. Link Arm Post Location 4. Truss Connection Point Slide 44 Slider Crank Mechanism (Image Source: https://ocw.metu.edu.tr/pluginfile.php/6885/mod_res ource/content/1/ch7/7-2.htm) Preliminary Design Too Fast, Too Furious? Bridge Operation: Solved New Concerns: - Maintenance - Slider Rail Anchorage - Performance Slide 45 - Constructability Decision Time: - Add Linear Span Lock Angle = 73.50° Final Design Tackling Eccentric Lift CL Pivot 4 5 3 5 Slide 46 4 3 2 2 1 1 Plan View of Hinged Sidewalk SAP2000 Analytical Model (Fully Open Position) Final Design 3D Modeling and Analysis Center Lock (Gap Spring) At Truss (Pin Support) Slide 47 Anchor Bracket Support (Gap Spring) Trunnion Shaft (Pin Supports) Final Design Details of the Final Solution Final hinged sidewalk Link Arm Post design detailing Diaphragm Connection Slide 48 Final Design Details of the Final Solution Bolted end-plate moment connection Slide 49 Hinged Sidewalk Girder 2 with end plate moment connection (October 2020) Final Design Details of the Final Solution Linkage limited to 7,000 lbs in operation Locking mechanism goes above diaphragm Slide 50 Building the New Bascule Structures for the Trail - Fabrication • Steel fabrication was completed by Hillsdale Fabricators, in St. Louis, Missouri • 3D BIM software was used Slide 51 the new hinged sidewalk pieces • Machined parts were completed by Lemke Industrial Machine, in Image from steel fabrication 3D model Marathon, Wisconsin Source: Hillsdale Fabricators Building the New Bascule Structures for the Trail Slide 52 Building the New Bascule Structures for the Trail - Erection • Erection took place in September 2020 for the SE Hinged Sidewalk and October 2020 for the NE Hinged Sidewalk Slide 53 SE Hinged Sidewalk (Girders 1 & 2) being erected Source: TY Lin Intl. Building the New Bascule Structures for the Trail Erection • Erection took place in September 2020 for the SE Hinged Sidewalk and October 2020 for the NE Hinged Sidewalk Slide 54 SE Hinged Sidewalk (Girders 1 & 2) being erected Source: TY Lin Intl. Fire along Chicago River temporarily closes Lake Shore Drive Monday afternoon –October 7, 2019 Slide 55 Concluding Remarks Lessons Learned WHAT LESSONS WERE HOW WERE NEW WHY WAS PROJECT LEARNED FROM THE TECHNOLOGIES NEEDED? PAST? USED? • Trail safety and flow • Look for simple • Computer modeling • More economical solution with large Slide 56 than separate • Include adjustments displacement bridge, maintains in the design capabilities historic entry to the • 3D analysis is City warranted on complex projects Acknowledgements Slide 57 Concluding Remarks Acknowledgements • WSP wishes to thank: • 2020 National AAAEA Virtual Conference organizing committee • Chicago Department of Transportation (CDOT), Division of Engineering • The WSP design team and subconsultant team: HBM Engineering, Ross Barney Architects, AAA Engineering, Slide 58 EJM Engineering (now Transmart), Kowalenko Consulting Group, Bloom Companies and SAM Consultant • TY Lin Intl. (construction manager) • Hillsdale Fabricators and Lemke Industrial Machine for sharing photos of the project.