design of a pedestrian bridge presentation to the village of tivoli
TRANSCRIPT
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Design of a Pedestrian Bridge Presentation to the Village of Tivoli, NY
May 14, 2015
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Overview of Team
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Presentation Overview● Site Overview &
Proposed Bridge Layout
● Code & Clearance Requirements
● Structural Design○ Piers○ Roof○ Stairs○ Handicap Ramp and
Lift System
● Structural Analysis○ Design Loads○ Truss Member Sizing○ Stress and Deflections
● Geotechnical Summary○ Sheet Piles○ Footing Design
● Cost & Maintenance
● Future Plans
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Site overview
● Limited on east side by adjoining property
● Limited on west side by riverbank
● Narrow package of land in which to satisfy clearance requirements
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Existing Property Lines
View Looking South from Diana StExisting Zoning Map
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Comparison of Bridge Layout with Stairs and Ramp
Footprint of Bridge with Stairs Footprint of Bridge with Ramps
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Working Design for Pedestrian Bridge
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Vertical Clearance
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Horizontal Clearance
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Bridge Materials
Timber Steel
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Structural System
Arch
Pratt Truss
Burr Truss
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Bridge Piers
Material: Steel
Member Section
Vertical Column HSS6x6x1/2
Horizontal Bracing L3x3x1/2
Diagonal Bracing (interior, lower) L6x6x1/2
Diagonal Bracing (all others) L5x5x1/2
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Bridge Pier Alternatives
Concrete Timber
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Primary Roof Design
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Bridge Roof Alternative Designs
Option #1
Option #2
Option #3
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Stair Design
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Stair Design (cont.)
10’-6”
10’-6”
52’
42’
80’ 25’
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Stairway Columns
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Ramp Design
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Inclined Handicap Lift
GSL Artira Inclined Platform Lift
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GSL Atira Specifications and Design Features (cont.)
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GSL Artira Specifications and Design Features
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Technical Specifications Cont’d
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Kayak Lift Theory
B
BA
C DC
D
A
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Design Loads
Load Name Load Type Calculated Design Load
Reference
Dead Load (DL) Gravity 60 psf -
Live Load (LL) Gravity 90 psf AASHTO Pedestrian Bridge Design Guide
Snow Load (SL) Gravity 30 psf ASCE 7
Wind Load (WL) Lateral 85 psf ASCE 7
Earthquake Load (E) Lateral 2.8 kips ASCE 7 & USGS
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Truss Structural System
Gravity Load Trusses Lateral Load Trusses Complete BridgeStructural SystemDL + LL + SL WL + E
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Member SizingTop Chord HSS 10x10x1/2
Bottom Chord HSS 10x10x1/2
Diagonals (2)-7x7 Parallams
Verticals 7x7 Parallam
Top Chord HSS 10x10x1/2
Bottom Chord HSS 10x10x1/2
Diagonals L 5x5x3/8
Verticals 3.5x11.875 Parallam
Bottom Chord Diagonal
Vertical Top Chord
STEEL
TIMBER
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SAP2000 Stress Ratios
Gravity Load Analysis Lateral Load Analysis
WL
DL + LL + SL
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Truss Member Max. Axial Force
Top Chord (G) 34 kips (C)
Bottom Chord (G) 34 kips (T)
Vertical (G) 25 kips (C)
Diagonal (G) 33 kips (C)
Top/Bot Chord (L) 50 kips (C or T)
Vertical (L) 11 kips (C or T)
Diagonal (L) 17 kips (C or T)
Stress and Deflections
(G) - Gravity
(L) - Lateral
(C) - Compression
(T) - Tension
GRAVITY LOAD CASE (G) LATERAL LOAD CASE (L)
0.44” Max Deflection0.92” Max Deflection
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Details● Driftwood railings● Copper-plated caging● Gutters● Stair treads● Roofing materials
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Sheetpile
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River Slope
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Spread Footing
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Location of Footings
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Cost Estimate
Geotechnical Estimate
Truss Estimate (Quoted from ExcelBridge)
Bridge Pier Estimate
Inclined Lift Estimate: TBD
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Maintenance$$$ Repainting Steel
$$$ Retreating Timber
$$ Snow/Ice Removal
$$ Deck Repair/Replacement
$$ Cleaning/Lubricating Bearings
$ Clearing Drains
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Possible Observation Platform
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Plans for future work
● Soil studies● Solar energy● Bring to an engineering firm
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Questions?