Topics for Breakout Sessions

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Topics for Breakout Sessions

• Ahmad Abu-Hawash
• Office of Bridges and Structures
• Iowa Department of Transportation

Iowa ABC Workshop, August 11-12, 2008 Des
Moines, Iowa
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Session Objectives

• Explore opportunities, identify obstacles, and
  propose action to implement ABC for three
  critical Iowa projects.
• Examine design details for prefabricated bridge
  components that have been used in Iowa.

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Breakout Sessions
Project Experts

• Broadway Viaduct (Team 1)
• Steve Kathol, Schemmer
• Iowa Falls Steel Arch (Team 2)
• Hussein Khalil, HDR
• I-80 over Walnut Creek (Team 3)
• Norm McDonald, Iowa DOT
• Prefabricated Components Details (Team 4)
• Jim Nelson, Iowa DOT

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Breakout Sessions
Facilitators and Recorders

• Broadway Viaduct (Team 1)
• Facilitator Kelly Strong, Iowa State University
• Recorder Sri Sritharan, Iowa State University
• Iowa Falls Steel Arch (Team 2)
• Facilitator Dennis Mertz, University of Delaware
• Recorder Chuck Jahren, Iowa State University
• I-80 over Walnut Creek (Team 3)
• Facilitator Wayne Klaiber, Iowa State University
• Recorder Brent Phares, Iowa State University
• Prefabricated Components Details (Team 4)
• Facilitator Mike Culmo, CME Associate
• Recorder Matt Rouse, Iowa State University

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US 6, Broadway Viaduct
Project Overview

• Steve D. Kathol, P.E., S.E.

Iowa ABC Workshop, August 11-12, 2008 Des
Moines, Iowa
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Broadway Viaduct
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US 6, Broadway Viaduct
Project Overview
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US 6, Broadway Viaduct
Existing Viaduct
Existing viaduct built in 1955, 1394 x 64,
19-span steel I-beam plus cellular abutments
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US 6, Broadway Viaduct
Traffic Phasing
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US 6, Broadway Viaduct
Proposed Plan and Section
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US 6, Broadway Viaduct
Construction Phasing
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US 6, Broadway Viaduct
Construction Phasing
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US 6, Broadway Viaduct
Construction Phasing
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US 6, Broadway Viaduct
Construction Phasing
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US 6, Broadway Viaduct
Construction Phasing
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US 6, Broadway Viaduct
Bridge Cross-Section
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Broadway Viaduct
Session Objectives

• Identify accelerated construction methods to
  complete each stage in one construction season
• Maintain two traffic lanes (staged construction)
• Avoid construction vibration
• Evaluate the use of light weight fill for
  approach fill

18
Iowa Falls Steel Arch
Project Overview

• Hussein Khalil, P.E.

Iowa ABC Workshop, August 11-12, 2008 Des
Moines, Iowa
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Iowa Falls Steel ArchProject Location
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Iowa Falls Steel Arch
Project Description

• Replace a 255 x 24 Open Spandrel Concrete Arch
  with a 230 x 64 Partial Thru Steel Arch
• Existing bridge and a nearby church are on the
  National Register of Historic Places
• Difficult site conditions (vertical limestone
  banks)
• Environmentally sensitive area
• Existing sewer lines directly below the structure
  

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Existing
Proposed
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Iowa Falls Steel Arch

• Limits of Construction

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Iowa Falls Bridge

• Typical Cross Section

12
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Iowa Falls Steel Arch
Project Background

• Need for Project
• Existing Bridge is Structurally Deficient
• No Practical Long Term Rehabilitation Options
• Traffic Estimates
• Year 2011 11,000 ADT with 8 Trucks
• Year 2031 15,400 ADT with 8 Trucks

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Iowa Falls Steel Arch
Project Background

• Feasibility study alternatives considered
• Single Span Steel Arch
• Single Span concrete Deck Arch
• Two Span Prestressed Girder Bridge
• City of Iowa Falls and Historical Commission
  Requested the Bridge Be Replaced with an Open
  Spandrel Bridge with Decorative Railings,
  Walkways, and Lighting

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Iowa Falls Steel Arch
Project Background

• Special Considerations
• St. Matthews by the Bridge Episcopal Church
  Listed in the National Register of Historic
  Places and Located about 20 West of the North
  End of the Bridge.
• Construction Vibration Concerns.
• Two Sanitary Sewer Lines
• Recommended that These be Replaced and Relocated
  Prior to Bridge Construction
• Dam Located Downstream of Bridge
• May Allow Lowering Water Level to Facilitate Some
  Construction Activities with Approval from DNR

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Iowa Falls Steel Arch
Session Objectives

• Identify accelerated construction methods to
  complete removal and replacement in one
  construction season
• Avoid demolition/construction related vibration
• Protect existing sewer lines (debris not allowed
  to fall into the river)
• Evaluate the use of temporary falsework or/and
  barges

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I-80/I-35 over Walnut Creek
Project Overview

• Norm McDonald, P.E.
• Iowa Department of Transportation

Iowa ABC Workshop, August 11-12, 2008 Des
Moines, Iowa
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I-80 over Walnut Creek
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I-80/I-35 over Walnut Creek
Project Description

• Existing bridge 408-6 x variable continuous
  steel I-beam (57-3 end spans and 4_at_73-6
  interior spans)
• Built in 1958 and widened twice in 1980s
• Three EB/NB lanes plus exit ramp
• Original deck (center lanes) is in need of
  replacement

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I-80 over Walnut Creek
Proposed Staging
Stage I
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I-80 over Walnut Creek
Proposed Staging
Stage II (Day Time)
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I-80 over Walnut Creek
Proposed Staging
Stage II (Night Time)
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I-80 over Walnut Creek
Session Objectives

• Identify accelerated construction methods to
  replace the original deck (center lanes)
• Maintain three traffic lanes during peak hours
• Evaluate replacement options deck vs.
  superstructure
• Existing shear connectors present a fatigue
  concern and may slow deck removal
• Evaluate deck options precast vs. cast-in-place

35
Prefabricated Components Details
Overview

• Jim Nelson, P.E.
• Iowa Department of Transportation

Iowa ABC Workshop, August 11-12, 2008 Des
Moines, Iowa
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Prefabricated Components Details
Background

• Details for construction using prefabricated
  components are important and must be
  constructible, cost effective and durable
• Details include
• Joints between precast panels
• Post-tensioning ducts and anchorages
• Connections between panels and girders (stud
  pockets)
• Haunch construction
• Box beam connections
• Precast substructure connections

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Prefabricated Components Details
Session Objectives

• Identify details used for accelerated
  construction projects.
• Evaluate best practices and optimization
  opportunities for details to accelerate
  construction, reduce cost and improve long term
  durability.

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Connection Details Used in Iowa