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SEAFARER’S CENTER PEDESTRIAN BRIDGE_PRESENTATION
- 1. SEAFARER’S CENTER PEDESTRIANBRIDGE PRESENTATION 7/28/2016
- 2. OBJECTIVE Introduce theSeafarer’s Center Pedestrian Bridge Project and review the project process and results.
- 3. WHY BUILD APEDESTRIAN BRIDGE? The seafarer’s center will have a restaurant open soon and POHA employees will need a way to cross the ditch to reach the Seafarer’s center It will provide access to a safe haven during fire drills It will provide recreation through a jogging trail (coming up next year) It would provide support to not just executive building inhabitants, but also parking for those who attend large Seafarer’s Center Events
- 4. AGENDA Optimal Routes Bridge Design Considerations Painted Steel Aluminum Galvanized Steel Weathered Steel Bridge Fabrication and Erection Cost Estimates Bridge Material Recommendation Aluminum vs Steel Life Cycle Cost Recommended Material Deck Material Recommendation Loadings Option Recommendation Foundation Design Anchorbolt Design Bridge and Foundation Drawings
- 5. OPTIMAL ROUTES Option 1:Located 112 feet from the bottom of the ditch Option 2: Located 300 feet from the bottom of the ditch Option 3: Located 230 feet from the bottom of the ditch
- 6. NARROW DOWN ROUTES SCALE1 bad 2 medium 3 good Remaining Options: Option 1 Option 2
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- 10. BRIDGE DESIGN CONSIDERATIONS Design consideration factors: Loading: Pedestrian Traffic Must not run into cable installed in the ground Width: The ADA compliant minimum inside clear width is 4 feet, but the actual width of the bridge will be 5 to 6 feet Narrow Bridge Advantages more efficient load support less material minimizes the risk of unintended use (like vehicular traffic) Since a narrow bridge is advantageous, we will go with the minimum: 6 feet Potential length of bridge: Option 1: 60 feet Option 2: 28 feet
- 12. PAINTED STEEL Advantages Disadvantages Highstrength to weight Weak fire resistance Strong and flexible Maintenance: Must be repainted Eco-friendly and low waste Brittle fracture Uniformity Susceptibility to buckling Ductility a solid material's ability to deform under tensile stress Fatigue Toughness the ability of a material to absorb energy and plastically deform without fracturing Heavy and expensive to transport
- 13. ALUMINUM Advantages Disadvantages Light weight Lowbending Low vibration absorption Low stress capability Anti-corrosive High strength to weight ratio Conductivity Resilient Recyclable Seamless
- 14. GALVANIZED STEEL Galvanizedsteel is steel that has been coated with zinc to prevent corrosion. Advantages Disadvantages Long life Internal rusting Low corrosion Unstable joints Protection at all areas Water contamination
- 15. WEATHERING STEEL "Weathering"refers to the chemical composition of these steels, allowing them to exhibit increased resistance to atmospheric corrosion compared to other steels. Advantages Disadvantages Low maintenance Marine environments o Weathering steel should not be used for bridges within 2km of coastal water. Appearance improves with age Atmospheric Pollution Weathering steel should not be used in atmospheres where high concentrations of corrosive chemicals or industrial fumes, specifically SO2, are present. Long Term Performance
- 16. DESIGN BUILD COSTESTIMATES Painted Steel Excel Bridge 60' by 6' cost $53,000 28' by 6' cost $32,000 Aluminum deck Gator Bridge 60' by 6' cost $33,450 28' by 6' cost $18,000 Excel Bridge Galvanized Steel 60' by 6' cost $68,000 28' by 6' cost $42,000 Weathered Steel Big R Bridge 60' by 6' cost $35,100 28' by 6' cost $17,700
- 17. BRIDGE MATERIAL RECOMMENDATION Weathering steel is ruled out because: It should not be used in atmospheres where high concentrations of corrosive chemicals or industrial fumes are present It is within 2 K of coastal waters This leaves the options of: Painted Steel Aluminum Galvanized Steel Materials Matrix Strength Eco- friendly Flexible Anti- corrosive Fire Resistance Maintenance Ease of Transport Weight Cost SUM Painted Steel 2 1 1 1 1 1 2 9 Aluminum 1 2 1 2 2 3 2 2 3 18 Galvanized Steel 3 1 3 1 2 1 1 1 13 SCALE
- 18. ALUMINUM VERSUS STEELLIFE CYCLE COST
- 19. Figure 1shows the Present Value (PV) for each cost and Total Cost of Ownership (TCO) for each option for a three percent discount rate. Using a three percent discount rate, aluminum has a better TCO than all other steel options by more than $7,000 for an urban environment, and by more than $16,000 for a maritime environment. Aluminum has a TCO equivalent to galvanized steel after 33 years in the urban environment, and after 21 years in the maritime environment.
- 20. RECOMMENDED MATERIAL Therecommended material to be used for the bridge is aluminum. Cost: The material cost itself is the least It has the least total cost of ownership Materials Matrix It scored the highest amount of point in the materials matrix, due to advantageous factors that outweighed those of the other materials.
- 21. DECKING MATERIAL DeckingOptions: Aluminum Standard Timber Tech Composite Decking Fiber Reinforced Polymer Synthetic Concrete *Prices below include bridge and deck Aluminum deck Gator Bridge 60' by 6' cost $33,450 28' by 6' cost $18,000 Standard Timber Tech Composite Decking Gator Bridge 60' by 6' cost $36,150 28' by 6' cost $19,260 FRP Synthetic Concrete Gator Bridge 60' by 6' cost $36,870 28' by 6' cost $19,596
- 22. DECK MATERIAL RECOMMENDATION Maintenance, durability, adherence (non-slip surface), and sustainability should be considered when choosing the most suitable decking material. Decking Material Matrix Maintenance Durability Adherence Sustainability Cost SUM Aluminum deck 3 3 3 3 3 15 Standard Timber Tech Composite Decking 1 1 1 2 2 7 FRP Synthetic Concrete 2 2 2 1 1 8 SCALE
- 23. RECOMMENDED DECKING MATERIAL The recommended decking material is aluminum Least cost Most points in the decking material matrix Durable, slip resistant, remains cool to the touch
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- 27. OPTION RECOMMENDATION Maximumallowed load according to Geotechnical report: 4500 psf Load the drill shafts of the 60 foot bridge would have to resist: 5000 psf Recommended cause of action: Have geotechnical engineer drill 50 feet, obtain bore hole, and provide allowable skin friction resistance or other method to resist 5000 psf Use the 28 foot bridge option
- 28. DECISION: To usethe 28 foot option Less project cost due to the size being half of the 60 foot Cost of geotechnical engineer drilling bore holes saved
- 29. FOUNDATION DESIGN FoundationDesign Program Viathor Vbent Analysis run on the estimated dimensions to predict whether it can sustain the maximum loading or not. Hand calculations done to confirm the Foundation Design Program results as well.
- 30. FOUNDATION DESIGN PierDiameter 2.5 feet Pier Length 22-24 feet Because, as seen in the Bore Log Report above, the soil obtains stiffness at 24 feet 10 inch Backwall Abuntment Cap 2 feet deep 3 feet wide 10 feet long
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- 32. BRIDGE AND FOUNDATIONDRAWINGS
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- 38. RESULT: Bridge: aluminumbridge and deck Lighting will be added upon completion 28 foot bridge, 6 foot clear width Foundation: Piers, backwall, abutment cap, anchorbolts designed Bid Package: CAD Drawings: Abutment, bridge location and details, foundation, profile, silt fence, dam Specifications: Bridge Drilled Pier Excavation Hydromulching Safety Mobilization and demobilization Storm water control
- 39. SCHEDULE Advertise onBuyspeed: November 10th, 2016 Bid Proposal Due Date: December 14th, 2016 Prebid Meeting/Site Visit: November 10th, 2016 Seafarer’s Center Restaurant Opening: January/February
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- 41. Objective: Introduce the Seafarer’sCenter Pedestrian Bridge Project and review the project process and results. Objective met? Any questions?