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Wabash Pedestrian Bridge Design . For Riverfront Development Committee INC. and The City of Terre Haute. Overview. Project Description Design Requirements Project Approach Summary / Conclusions. Project Description. Help jump start the “take back the river” initiative Trail & wetlands

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Wabash pedestrian bridge design l.jpg

Wabash PedestrianBridge Design

For

Riverfront Development Committee INC.

and

The City of Terre Haute


Overview l.jpg
Overview

  • Project Description

  • Design Requirements

  • Project Approach

  • Summary / Conclusions


Project description l.jpg
Project Description

  • Help jump start the “take back the river” initiative

  • Trail & wetlands

    past projects

  • The big picturefor Terre Haute


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Project Description

  • Extend the National Road Heritage Trail

  • Host of the Division I National Cross-Country Finals

  • Become the “running capital” of America


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Design Requirements

  • Distinguish Indiana’s statewide trail system

  • Four bridge design options

  • Accommodate simultaneous pedestrian and bicycle use

  • Wastewater collection line


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St. Mary of the Woods College

US HWY 40

Dresser Community

Fairbanks Park

Bridge Site Crossing

Hulman Street

I-70


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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


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Bridge Design Options

  • Historic Bridge Relocation – INDOT

  • Prefabricated Bridge

  • US 40 Replica Bridge

  • Signature Structure


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Breakdown of Assessment

Construction Cost

- Materials, erection, funding

Aesthetics

- Visibility

- Geometry

- Transparency


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Bridge Design Selection

Determined using a decision matrix

Aesthetics Construction Average Weighted (60%) Costs (40%) Rating

Bridge Option

Prefabricated

US 40 Replica

2 3 2.4

1 3 1.8

3

2

2.6

Signature Structure


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Signature Structure

Double Thrust Arch


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Arch Design

  • Height = 130 feet

  • Length = 630 feet between ends

  • Width = 20 feet at deck connections

  • Cables evenly spaced every 15 feet


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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)


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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


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Superstructure Design

Steel Girder


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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


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Superstructure Design

Element

Member Dimensions

Other Characteristics

Approach Girder

Width Top Flange = 17 ft

Built up section using A36 steel plates

Width Bottom Flange = 15 in

Depth = 3 ft

Transverse Stiffeners @ 4 ft

Thickness Top Flange = 0.75 in

Thickness Bottom Flange 0.5 in

Longitudinal Stiffeners @ 4 ft from centerline.

Thickness Web = 1 in

Center Span Girder

Width Top Flange = 17 ft

Built up section using A36 steel plates

Width Bottom Flange = 15 ft

Depth = 3 ft

Transverse stiffeners @ 3 ft

Thickness Top Flange = 0.75 in

Longitudinal stiffeners @ 4 ft from centerline and @ 1 ft. from centerline.

Thickness Bottom Flange = 0.25 in

Thickness Web = 0.3 in


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Superstructure Design

SlabCross- Section

Reinforced Concrete Slab

Element

Element Characteristic

Concrete

Thickness = 8 in.

Flexural Reinforcement

No. 5 bars @ 9 in. on center in both

Positive and negative regions running transversely

Temperature and Shrinkage

No. 4 bars @ 12 in. on center spacing

running longitudinally

Clear Cover

2.5 in. clear cover


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Subsurface Investigation

Soils:

  • East Bank = Sandy Glacial Outwash

  • West Bank = Loamy Alluvium

    Bedrock:

  • Carbondale Group

  • ~110 feet below ground surface


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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




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Arch Foundation Design

228 k

263 k

160 k

Plan View

Side Elevation


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Pier Design

25.0 k/ft

Side Elevation

Plan View


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Abutment Design

  • West Bank: ω= 17.1 k/ft

  • East Bank: ω = 16.3 k/ft

ω

Plan View

Side Elevation



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Cross Section #8

Cross Section #7

Cross Section #6

Cross Section #5

Cross Section #4

Hydraulic Study

Cross Section #3

Proposed Bridge

Modeled using HEC-RAS

Modeled with and without the proposed bridge

Used 2 downstream cross sections and 7 upstream cross sections

Cross Section #2

Cross Section #1


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Hydraulic Study

  • Modeled with bridge deck above floodplain

  • Arch piers modeled as vertical piers for simplicity

Cross Section #2


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Hydraulic Study

  • W.S. elevation change less than 0.14 ft required by IDNR

  • Greatest change in elevation is 0.06 ft

0.06


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Cost Estimate

Subtotal = $1,835,000

Prices for steel plates from: Discount Steel, Inc

Prices for steel cable from: Southwest Wire Rope


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Cost Estimate

Subtotal = $1,912,000

Prices for steel plates from: Discount Steel, Inc.

Prices for concrete and rebar from: RS Means, Building Construction Cost Data


Cost estimate33 l.jpg
Cost Estimate

Subtotal = $175,000

All prices taken from: RS Means, Building Construction Cost Data


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Cost Estimate

  • Includes

  • Material cost

  • Labor cost

  • Equipment costs

  • Overhead & Profit

Total Cost + Design Fees = $4,511,000


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Conclusions

  • Project Background

  • Site Location

  • Design Options and Assessment

  • Subsurface Investigation

  • Foundation Design

  • Bridge Deck Design

  • Bridge Arch Design

  • Hydraulic Study

  • Cost Estimate