3 rd Annual Bridge Seminar Day. New Bridges Over Kentucky Lake. Design of a 550 Basket-handle Network Tied Arch

Transcription

1 3 rd Annual Bridge Seminar Day New Bridges Over Kentucky Lake Design of a 550 Basket-handle Network Tied Arch Jason Stith, PhD, PE, SE February 4, 2014

2 PRESENTATION OUTLINE Project overview Key superstructure design features Consider fabrication, construction, maintenance, and inspection Design goal: minimize risk, not necessarily material Bid results Competition February 4,

3 LOCATION February 4,

4 SITE MAP Bridge Sites February 4,

5 KENTUCKY LAKE February 4,

6 NAVIGATIONAL CLEARANCE 502 Minimum Horizontal Clearance 60 Minimum Vertical Clearance Navigation Clearance Window Kentucky Lake (Looking Downstream) February 4,

7 BRIDGE CROSS SECTION 23'-0" 2 10'-0" = 20'-0" 12'-0" SHOULDER Kentucky Lake (Looking East) C L US 68 4'-0" 4'-0" 2 11'-0" = 22'-0" 6'-0" 6'-0" 2SHLD 12'-0" = 24'-0" SHLD. SHLD. SHLD. EXISTING TYPICAL SECTION L US 68 (Looking East) 102'-6" 74'-6" C 8'-0" 12'-0" 4'-0" 4'-0" SIDEWALK 2 11'-0" = 22'-0" 12'-0" SIDEWALK SHLD. 2 12'-0" = 24'-0" SHLD AND SHOULDER AND BIKE PATH BIKE PATH 2% 2% 2% 2% 2% ORIGINALREDUCED TYPICAL SECTION (Looking East) February 4,

8 MAXIMIZE CAUSEWAYS KY Lake 9080 ft Total 1400 ft West Causeway 1000 ft East Causeway 580 ft Lagoon Bridge 3611 ft Lake Bridge 1408 ft West Approach 550 ft Arch 1652 ft East Approach February 4,

9 PILE LOAD TESTING Purpose Confirm Geot. Parameters Test Drivability Refine Ground Response Test Pile Capacity February 4,

10 KY LAKE DESIGN September 10,

11 BRIDGE TERMS Rib Hangers Tie February 4,

12 INCLINED RIB BASKET-HANDLE Vierendeel Bracing 15 Incline February 4,

13 NETWORK STUDY RESULTS Hanger arrangement does not affect uniformly distributed loads 7000 Rib Dead Load Moment Moment (kip-ft) Location Along Rib (ft) February 4, Deg 90 Deg 13

14 NETWORK STUDY RESULTS Maximum live load demand for network hangers 33% of vertical hangers 8000 Rib Live Load Moment 7000 Moment (kip-ft) Location Along Rib (ft) February 4, Deg 90 Deg 14

15 HANGER KYTC prefers bridge structural strand Good track record within Kentucky Rib and tie designed for the sudden loss of any strand and for strand replacement February 4,

16 H-SECTION RIB Box section or H-section Fabrication, maintenance, and inspection Challenges of utilizing H-section In-plane moment, H-section weak axis Hanger loss Torsion in end panel H-section Benefit Economical Inspectable Hanger connection February 4,

17 KNUCKLE Rib / Tie / End FB Critical for geometric control Most complicated fabrication component Use 3-D FEA February 4,

18 KNUCKLE - STRESS CHECK February 4,

19 KNUCKLE BUCKLING CHECK February 4,

20 Tie girder geometry TIE GIRDER Determined from rib and floor beam Parallelogram shaped box to facilitate knuckle region Fracture critical member Designed for loss of any one plate Flanges and web bolted with subflange to prevent progressive fracture February 4,

21 ARCH BRIDGE February 4,

22 INTEGRAL FLOOR SYSTEM Stringer frame directly in floor beams Benefits: Eliminates bearing and joints from future maintenance Increase efficiency of the deck and floor beams (two-way slab action) Reduces the depth of the superstructure Challenges Creep and shrinkage affects on floor beam February 4,

23 NEW MADRID FAULT Mississippi River Ohio River Cumberland River Tennessee River New Madrid, MO Mississippi River 80 Miles Project Site February 4,

24 SEISMIC DESIGN Criteria and Objectives AASHTO LRFD Seismic Design Essential Bridge Classification 1000 year return period Elastic during design seismic event Remain open after design seismic event Minor repairs after design seismic event February 4,

25 SEISMIC SOLUTIONS Isolation Bearings Springs Seismic Modular Exp. Joints Middle Bearings (2) Seismic Dampers February 4,

26 BRIDGE LETTING KYTC was committed to: Providing as much information to contractors as early as possible 60% plans, 90% plans, preliminary special note, etc. Track changes between submittals Special letting date Marketing to contractors, fabrications, and industry groups February 4,

27 EFFECT OF MULTIPLE BIDDERS February 4,

28 BID RESULTS December 20, 2013 Letting Bid Appraisal BIDDER BID % Engineers Estimate $151,145, JOHNSON BROS CORP. $131,501, % C J MAHAN CONST J/V PARSONS CONST GROUP $135,737, % AMERICAN BRIDGE CO J/V TRAYLOR BROS INC $138,087, % FLATIRON CONSTR INC J/V MANSON CONST CO $138,702, % TULLY CONSTRUCTION CO INC $143,676, % ALBERICI-KENNY JOINT VENTURE $144,182, % MASSMAN-WALSH A JOINT VENTURE $146,932, % KAY & KAY CONTRACTING LLC $163,974, % AVERAGE $142,849, % February 4,

29 CONCLUSIONS First network arch in the state Design for fabrication, construction, maintenance, and inspection Design Goal: Not necessarily minimizing material, it s about minimizing project risk! Maximize competition February 4,

30 QUESTIONS? Thank you! February 4,