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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

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Wabash PedestrianBridge 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

    past projects

  • The big picturefor Terre Haute


Project Description

  • Extend the National Road Heritage Trail

  • Host of the Division I National Cross-Country Finals

  • Become the “running capital” of America


Design Requirements

  • Distinguish Indiana’s statewide trail system

  • Four bridge design options

  • Accommodate simultaneous pedestrian and bicycle use

  • Wastewater collection line


St. Mary of the Woods College

US HWY 40

Dresser Community

Fairbanks Park

Bridge Site Crossing

Hulman Street

I-70


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


Bridge Design Options

  • Historic Bridge Relocation – INDOT

  • Prefabricated Bridge

  • US 40 Replica Bridge

  • Signature Structure


Breakdown of Assessment

Construction Cost

- Materials, erection, funding

Aesthetics

- Visibility

- Geometry

- Transparency


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


Signature Structure

Double Thrust Arch


Arch Design

  • Height = 130 feet

  • Length = 630 feet between ends

  • Width = 20 feet at deck connections

  • Cables evenly spaced every 15 feet


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)


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


Superstructure Design

Steel Girder


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


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


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


Subsurface Investigation

Soils:

  • East Bank = Sandy Glacial Outwash

  • West Bank = Loamy Alluvium

    Bedrock:

  • Carbondale Group

  • ~110 feet below ground surface


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


West Bank


East Bank


Arch Foundation Design

228 k

263 k

160 k

Plan View

Side Elevation


Pier Design

25.0 k/ft

Side Elevation

Plan View


Abutment Design

  • West Bank: ω= 17.1 k/ft

  • East Bank: ω = 16.3 k/ft

ω

Plan View

Side Elevation


Foundation Summary


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


Hydraulic Study

  • Modeled with bridge deck above floodplain

  • Arch piers modeled as vertical piers for simplicity

Cross Section #2


Hydraulic Study

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

  • Greatest change in elevation is 0.06 ft

0.06


Cost Estimate

Subtotal = $1,835,000

Prices for steel plates from: Discount Steel, Inc

Prices for steel cable from: Southwest Wire Rope


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 Estimate

Subtotal = $175,000

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


Cost Estimate

  • Includes

  • Material cost

  • Labor cost

  • Equipment costs

  • Overhead & Profit

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


Conclusions

  • Project Background

  • Site Location

  • Design Options and Assessment

  • Subsurface Investigation

  • Foundation Design

  • Bridge Deck Design

  • Bridge Arch Design

  • Hydraulic Study

  • Cost Estimate


Questions?


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