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Current Delaware Memorial Bridge Protection System.

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Presentation on theme: "Current Delaware Memorial Bridge Protection System."— Presentation transcript:

1 Current Delaware Memorial Bridge Protection System

2 Bridge Protection System b Team: 98.6 b Members: Nikhil Bhate, Brandon Clark, Neil Smith, Scott Suhmann b Direct Customer: Hardcore DuPont Composites, LLC b Advisor: Dr. Jack Vinson b Mission: By the end of Spring Semester 1998, design, fabricate, and test a working unit section model of a bridge protection system that gives meaningful information towards replacing the current fender system on the Delaware Memorial Bridge. b Approach: Use Total Quality Design principles to provide a background for concept generation and evaluation.

3 Customers List: b Hardcore DuPont: George Tunis, Dave HarrisGeorge Tunis, Dave Harris b Delaware River Bay Authority (DRBA): Joe Volk, Rick Volk, Steve MooreJoe Volk, Rick Volk, Steve Moore b Delaware Pilot’s Association: Captain LintonCaptain Linton b Army Corps Of Engineers: b Governmental Agencies: b Construction Crew: b Other Ships and Vessels: Maurice Richard, Tony SmithMaurice Richard, Tony Smith

4 Wants, Metrics, and Target Values

5

6 Constraints: b Cannot Alter Bridge Foundation b Cannot Obstruct 1000 foot channel b Visible b No Creosols b No Lead Based Paints

7 Benchmarking b System Benchmarking Protection Systems for smaller vesselsProtection Systems for smaller vessels –Camels, Fenders, Springs Protection Systems for larger vesselsProtection Systems for larger vessels –Sunshine Skyway Bridge, Golden Gate Bridge, Great Belt Easter Bridge

8 Benchmarking b Functional Benchmarking Energy Absorbing SystemsEnergy Absorbing Systems –Hex-Foam, Cushion Wall, Hexalite, Fluidic Shocks Cushion Wall Hex-Foam Sandwich

9 Concept Generation b Artificial Island b Stand Alone Dolphin System b Horizontal Piling Structure b Pile Supported Fender with Large Protective Cells

10 Artificial Island b Large island surrounding footing, made of any material b Easy to Construct b Difficult to apply composites

11 Dolphin System b Two or more composite walled structures filled with crushed stone or sea shells around footing b Prevents head-on impact b Too expensive to protect side impact

12 Horizontal Piling Structure b Filled Pilings arranged horizontally outward from footing. b Device attached to induce fracture inside piling on impact b Dissipates energy through fracture mechanics b Theory difficult to apply to ship impact b Destroyed during use

13 Pile Supported Fender with Protective Cells b Takes advantage of large protective cells for head on impact b Channel side protected by smaller fender structure b Uses composites to aid installation b Makes use of structural aspects of composite materials b Complex design

14 Concept Selection b Evaluated advantages and shortcomings of concepts through an iterative design process (SSD). b Pile Supported Fender System determined to be the best in terms of satisfying wants and metrics

15 Advantages of Design b Uses composites to reduce installation time b Composite adds structural advantages Composite replaces rebar by taking tensile loadsComposite replaces rebar by taking tensile loads Composite confines concrete eliminating the need for stirrups in support columnComposite confines concrete eliminating the need for stirrups in support column

16 Concept Discussion b Choosing a design vessel: b An 80,000 ton ship was chosen

17 Concept Discussion b Vessel Speed and Orientation: Using tactical diameter, depth conditions, and current flow data an angle of attack of 30°, and speed of 4 knots was calculated.Using tactical diameter, depth conditions, and current flow data an angle of attack of 30°, and speed of 4 knots was calculated.

18 Design Details b Protective Cells: 80 ft dia.80 ft dia. Situated at footing end to prevent head on collisionSituated at footing end to prevent head on collision Composite sheath, filled with gravel, and capped with concreteComposite sheath, filled with gravel, and capped with concrete

19 Design Details b Support Columns 12 ft dia.12 ft dia. 1” thick carbon glass hybrid pile1” thick carbon glass hybrid pile Installed in sectionsInstalled in sections Filled with concreteFilled with concrete Assumed to be cantilevered at 500 year scourAssumed to be cantilevered at 500 year scour

20 Design Details b Support Column Applied load: 1.11E6 lbs.Applied load: 1.11E6 lbs. EI total: 2.17E13 lb.-in^2EI total: 2.17E13 lb.-in^2 Base Bending Moment: 1.07E9 in-lb.Base Bending Moment: 1.07E9 in-lb. Tube tensile stress: 5.37E4 psiTube tensile stress: 5.37E4 psi Filler compression stress: 7.4E3 psiFiller compression stress: 7.4E3 psi

21 Design Details b Fender 20 ft. x 15 ft. x 36 ft.20 ft. x 15 ft. x 36 ft. Concrete encased with ‘bottle core’ compositeConcrete encased with ‘bottle core’ composite Cone at base for installationCone at base for installation Rebar used to distribute load to pileRebar used to distribute load to pile

22 Design Methodology

23 b Design focus on support column and fender Protective cell size benchmarkedProtective cell size benchmarked b Iterative design process for support column analyzed diameters of 10 ft. to 14 ft.analyzed diameters of 10 ft. to 14 ft. determined the flexural rigidity of composite column with concrete fillerdetermined the flexural rigidity of composite column with concrete filler

24 Force - Displacement

25 Testing b Tested to determine distribution factor due to the adjacent piles.

26 Costing b Concrete: $875,000 b Composites: Protection Cell -- $400,000Protection Cell -- $400,000 Support Columns -- $165,000Support Columns -- $165,000 Bottle Core Wall -- $3,750,00Bottle Core Wall -- $3,750,00 b Total: $10.3 million b Labor: $9.5 million

27 Issues for Further Investigation b Further costing analysis b Connecting fender to end protection cells b Test a larger scale prototype for further proof of distribution factor.


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