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Document Sample
Wabash Pedestrian
Bridge Design
For
Riverfront Development Committee INC.
and
The City of Terre Haute
Wabash Pedestrian Bridge Design
Overview
• Project Description
• Design Requirements
• Project Approach
• Summary / Conclusions
Wabash Pedestrian Bridge Design
Project Description
• Help jump start the “take back the river”
initiative
• Trail & wetlands
past projects
• The big picture
for Terre Haute
Wabash Pedestrian Bridge Design
Project Description
• Extend the National
Road Heritage Trail
• Host of the Division I
National Cross-Country
Finals
• Become the “running
capital” of America
Wabash Pedestrian Bridge Design
Design Requirements
• Distinguish Indiana’s statewide trail system
• Four bridge design options
• Accommodate simultaneous pedestrian and
bicycle use
• Wastewater collection line
Wabash Pedestrian Bridge Design
St. Mary of
the Woods
College
Dresser
Community Fairbanks
Park
Bridge Site
Crossing Hulman
Street
Wabash Pedestrian Bridge Design
Site Location
Fairbanks Park Site
– Best of 4 total locations
– Total bridge length ~890
feet
– Highly visible
– Topography lends itself well
– Does not interfere with
Dresser community
Wabash Pedestrian Bridge Design
Bridge Design Options
• Historic Bridge Relocation – INDOT
• Prefabricated Bridge
• US 40 Replica Bridge
• Signature Structure
Wabash Pedestrian Bridge Design
Breakdown of Assessment
Construction Cost
- Materials, erection, funding
Aesthetics
- Visibility
- Geometry
- Transparency
Wabash Pedestrian Bridge Design
Bridge Design Selection
Determined using a decision matrix
Aesthetics Construction Average Weighted
Bridge Option (60%) Costs (40%) Rating
Prefabricated 2 3 2.4
US 40 Replica 1 3 1.8
Signature Structure 3 2 2.6
Wabash Pedestrian Bridge Design
Signature Structure
Double Thrust Arch
Wabash Pedestrian Bridge Design
Arch Design
• Height = 130 feet
• Length = 630 feet between ends
• Width = 20 feet at deck connections
• Cables evenly spaced every 15 feet
Wabash Pedestrian Bridge Design
Wabash Pedestrian Bridge Design
Arch Design
Nine Loading Scenarios
1 Dead Load
2 Pedestrian Load (Uniform and Patch)
2 Ambulance Load (Mid-span and Abutment)
1 Wastewater Collection System
3 Wind (Longitudinal, Transverse, Uplift)
Wabash Pedestrian Bridge Design
Arch Design
3 Separate members designed utilizing:
MASTAN2 Structural Analysis Software
AASHTO Guide Specifications for Design of
Pedestrian Bridges
AASHTO Standard Specifications for Design
of Highway Bridges
AISC Steel Construction Manual
Element Member Sizes Other Characteristics
Width = 3.00 ft
Built up section A36
Arch Element Height = 3.00 ft
Steel Plate
Thickness = 1.50 in
Steel Cables Diameter = 1.50 in Fy = 120 ksi
Width = 1.50 ft
Built up section A36
Arch Braces Height = 1.50 ft
Steel Plate
Thickness = 0.50 in
Wabash Pedestrian Bridge Design
Superstructure Design
Steel Girder
Wabash Pedestrian Bridge Design
Superstructure Design
• Steel girder design for approach and center
spans
• Concrete slab design
• AISC Steel Construction Manual, ACI Code,
AASHTO Standard Specifications for Highway
Bridges, AASHTO Guide Specifications for
Design of Pedestrian Bridges
Wabash Pedestrian Bridge Design
Superstructure Design
Element Member Dimensions Other Characteristics
Width Top Flange = 17 ft Built up section using A36 steel
Width Bottom Flange = 15 in plates
Depth = 3 ft
Approach Girder Transverse Stiffeners @ 4 ft
Thickness Top Flange = 0.75 in
Thickness Bottom Flange 0.5 in Longitudinal Stiffeners @ 4 ft from
Thickness Web = 1 in centerline.
Width Top Flange = 17 ft Built up section using A36 steel
Width Bottom Flange = 15 ft plates
Depth = 3 ft Transverse stiffeners @ 3 ft
Center Span Girder
Thickness Top Flange = 0.75 in
Longitudinal stiffeners @ 4 ft from
Thickness Bottom Flange = 0.25 in centerline and @ 1 ft. from
centerline.
Thickness Web = 0.3 in
Wabash Pedestrian Bridge Design
Superstructure Design
Slab Cross - Section
Reinforced Concrete Slab
Element Element Characteristic
Concrete Thickness = 8 in.
No. 5 bars @ 9 in. on center in both
Flexural Reinforcement Positive and negative regions running
transversely
Temperature and No. 4 bars @ 12 in. on center spacing
Shrinkage running longitudinally
Clear Cover 2.5 in. clear cover
Wabash Pedestrian Bridge Design
Subsurface Investigation
Soils:
• East Bank = Sandy Glacial Outwash
• West Bank = Loamy Alluvium
Bedrock:
• Carbondale Group
• ~110 feet below ground surface
Wabash Pedestrian Bridge Design
Foundation Design
Challenges:
• Uncertain Soil Properties
• Both Lateral and Vertical Loading
– Broms Method (Lateral)
– Tip & Side Friction Methods (Axial)
• Five Separate Designs
– East & West Abutments
– East & West Arch Foundations
– West Pier
Wabash Pedestrian Bridge Design
West Bank
Wabash Pedestrian Bridge Design
East Bank
Wabash Pedestrian Bridge Design
Arch Foundation Design
228 k
263 k
160 k
Plan View Side Elevation
Wabash Pedestrian Bridge Design
Pier Design
25.0 k/ft
Side Elevation
Plan View
Wabash Pedestrian Bridge Design
Abutment Design
• West Bank: ω = 17.1 k/ft
• East Bank: ω = 16.3 k/ft
ω
Plan View Side Elevation
Wabash Pedestrian Bridge Design
Foundation Summary
East Bank West Bank West Bank East Bank West Bank
Location
Arch Arch Pier Abutment Abutment
Vertical Load
228 228 316 260 463
(kip)
Lateral Load
308 308 0 57 18
(kip)
Footing Size
11' x 11' x 2' 23' x 23' x 2' 15' x 12' x 2' 15' x 12' x 10" 15' x 10' x 2'
(L x W x D)
Stem Size
-- -- 15' x 12' x 10" 15' x 12.5' x 10" 15' x 5.5' x 10"
(L x W x T)
No. of Piles 16 25 12 8 6
Pile size PP14x0.625 PP24x0.500 PP24x0.500 PP16x0.250 PP30x0.500
Pile Depth (ft) 36 60 82 45 76
Cross Section #8
Cross Section #7
Hydraulic Study
Cross Section #6
Cross Section #5
Cross Section #4
•Modeled using HEC-RAS
•Modeled with and without the
Cross Section #3
proposed bridge
•Used 2 downstream cross
Proposed
Bridge
sections and 7 upstream cross
Cross Section #2
sections
Cross Section #1
Wabash Pedestrian Bridge Design
Hydraulic Study
•Modeled with
bridge deck
above floodplain
•Arch piers
modeled as
vertical piers for
Cross Section #2 simplicity
Wabash Pedestrian Bridge Design
Hydraulic Study
• W.S. elevation Comparison
change less than Station # River StaW.S. Elev (ft) W.S. Elev (ft) W.S. Elev (ft)
Without Bridge With Bridge Change
8 218.038 476.38 476.43 0.05
0.14 ft required 7
6
218
217.5
476.36
476.12
476.41
476.17
0.05
0.05
by IDNR 5
4.5
217.356
217.3275
475.87 475.92
US-40 Bridge
0.05
4 217.299 473.42 473.47 0.05
• Greatest change 3
2.5
217.29
216.65
473.53 473.59
Proposed Bridge
0.06
0.06
in elevation is 2
1
216.64
216.17
473.28
473.01
473.28
473.01
0.00
0.00
0.06 ft
Wabash Pedestrian Bridge Design
Cost Estimate
Bridge Arch
Materials Price per Unit # of Units Total Price
Steel Plate (A36) (8' x 1½' x ½") $857.65 /plate 115 @ plates $98,630
Steel Plate (A36) (8' x 3' x 1½') $4,406.78 /plate 368 @ plates $1,621,695
Steel Cable (diameter = 2.75") $43.73 /ft 2,614.35 ft $114,326
Subtotal = $1,835,000
Prices for steel plates from:
Discount Steel, Inc
Prices for steel cable from:
Southwest Wire Rope
Wabash Pedestrian Bridge Design
Cost Estimate
Superstructure
Material Price per Unit # of Units Total Price
Steel Plate (A36) (8' x 4' x ¾") $2,362.19 /plate 90 @ plates $212,597
Steel Plate (A36) (8' x 2½' x ¾") $1,774.12 /plate 60 @ plates $106,447
Steel Plate (A36) (8' x 4' x ½") $1,494.73 /plate 303 @ plates $452,903
Steel Plate (A36) (8' x 3' x ½") $1,239.10 /plate 30 @ plates $37,173
Steel Plate (A36) (8' x 2½' x ½") $1,112.48 /plate 142 @ plates $157,972
Steel Plate (A36) (8' x 2' x ½") $985.06 /plate 1 @ plates $985
Steel Plate (A36) (4½' x 2' x ½") $607.74 /plate 2 @ plates $1,215
Steel Plate (A36) (8' x 4' x ¼") $648.12 /plate 213 @ plates $138,050
Steel Plate (A36) (8' x 3' x ¼") $526.46 /plate 71 @ plates $37,379
Steel Plate (A36) (8' x 2' x ¼") $404.80 /plate 1 @ plates $405
Steel Plate (A36) (4½' x 2' x ¼") $247.00 /plate 2 @ plates $494
Stiffeners (8' x 3' x ½") $1,239.90 /plate 380 @ plates $471,162
Stiffeners (8' x 3' x ¾") $1,970.14 /plate 120 @ plates $236,417
3 3
Concrete $102.00 /yd 330 yd $33,660
Steel Rabar (#4) $1,410.00 /ton 4.162 tons $5,868
Steel Rebar (#5) $1,410.00 /ton 13.413 tons $18,912
Subtotal = $1,912,000
Prices for steel plates from:
Discount Steel, Inc.
Prices for concrete and rebar from:
RS Means, Building Construction Cost Data
Wabash Pedestrian Bridge Design
Cost Estimate
Foundations
Materials Price per Unit # of Units Total Price
3 3
Excavation, Structural, 3/4 C.Y. bucket $11.10 /yd 196 yd $2,176
3 3
Fill (soil used from excavation) $2.09 /yd 139 yd $291
3 3
Concrete $102.00 /yd 95.38 yd $9,729
Pipe Pile 30" x 0.500" @ 76' $3,589.48 /pile 6 piles $21,537
Pipe Pile 24" x 0.500" @ 82' $3,434.16 /pile 12 piles $41,210
Pipe Pile 24" x 0.500" @ 60' $2,512.80 /pile 25 piles $62,820
Pipe Pile 16" x 0.250" @ 45' $1,596.60 /pile 10 piles $15,966
Pipe Pile 14" x 0.625" @ 36' $1,150.20 /pile 16 piles $18,403
Steel Rebar (#4) $1,410.00 /ton 0.1453 tons $205
Steel Rebar (#5) $1,410.00 /ton 0.0183 tons $26
Steel Rebar (#6) $1,410.00 /ton 0.6038 tons $851
Steel Rebar (#7) $1,410.00 /ton 0.4701 tons $663
Steel Rebar (#8) $1,120.00 /ton 0.7843 tons $878
Steel Rebar (#9) $1,120.00 /ton 0.1275 tons $143
Subtotal = $175,000
All prices taken from:
RS Means, Building Construction Cost Data
Wabash Pedestrian Bridge Design
Cost Estimate
Bridge Arch Subtotal = $1,835,000
Superstructure Subtotal = $1,912,000
Includes Foundations Subtotal = $175,000
•Material cost Total Cost = $3,922,000
•Labor cost
Design Fees 15% of the Total Cost $589,000
•Equipment costs
•Overhead & Profit
Total Cost + Design Fees = $4,511,000
Wabash Pedestrian Bridge Design
Conclusions
• Project Background
• Site Location
• Design Options and Assessment
• Subsurface Investigation
• Foundation Design
• Bridge Deck Design
• Bridge Arch Design
• Hydraulic Study
• Cost Estimate
Wabash Pedestrian Bridge Design
Questions?
