Category: Events - Important (on right) MassDOT’s 93FAST14 Project

November 4, 2014 N/A

The 2014 in-depth web training features the Massachusetts DOT's 93FAST14 project. In this project ABC was used in the replacement of 14 bridges on Interstate 93 in Medford, Middlesex Country. The bridge superstructures were installed during 55-hour weekend closures over a 10 weekend period during the summer of 2011.

Module 1:  Introduction

by Tom Donald, P.E., Director of Bridge Project Management, MassDOT

Module 1 Presentation

  • MassDOT’s Accelerated Bridge Program
  • Overview of 14 bridge replacements in 10 weeks
  • Decision to use Design Build
  • Post-construction inspection and performance

Module 2:  Planning and Preliminary Design

by Mike Culmo, P.E., Vice President, Transportation and Structures, CME Associates, Inc.

Module 2 Presentation

  • History of project development
  • Project priorities
  • Decision for use of ABC vs conventional construction
  • Cost implications of ABC vs. Conventional
  • Overall project timeline / schedule
  • Prefabrication options and preliminary design approach
  • Preliminary Substructure Analysis
  • Performance specification for closure pours
  • Roles and responsibilities

Module 3 :Design Details – Substructure Rehabilitation

by Joe Gill, P.E., President, Gill Engineering

Module 3 Presentation

  • Design requirements
  • Substructure analysis
    • Issues with applying LRFD to existing substructure
    • Rational approach used
  • Bearing seat modifications
    • Requirements for shallower beams
    • Different beam spacing
    • Shoring and beam end removal for beam seat modifications
  • Abutment modifications
    • Use of approach slabs as dead-men

Module 4:  Design Details – Superstructure Replacement

by Joe Gill, P.E., President, Gill Engineering

Module 4 Presentation

  • Design requirements
    • No real design differences
    • Designed as simple spans with link slabs
    • Minimize beam depth to improve vertical clearance
    • Complications associates with large skews
  • Diaphragms
    • Minimize the number of diaphragms
    • Use of diaphragms on closure pour bays
  • Cast-in-place barriers
    • Why not precast?
    • Use of shoulders for work zone.
  • Construction issues
    • Crane picks controlled most sites
    • Minimize weight on PBUs
  • Closure pour issues
    • High early strength
    • Control of shrinkage to minimize cracking
    • Details and reinforcing
    • Design for interim strength
  • Link slab design – jointless deck
  • Slab details at abutments
  • Diaphragms
  • Bearing layout and design
    • Floating Bridge Concept
    • Use of sliding bearings to control seismic forces
    • Deck protection – HMA and waterproofing vs. exposed deck

Module 5:  Preliminary Construction Planning

by Kevin Lampron, Jr. P.E., Area Manager, J.F. White Contracting Company

Module 5 Presentation

  • Minimum required information
  • Contractor experience requirements
  • Innovative contracting strategies
  • Timeline and schedule
  • Plans
  • Specifications
  • Incident management strategies

Module 6:  Construction

by Kevin Lampron, Jr. P.E., Area Manager, J.F. White Contracting Company

Module 6 Presentation

  • Contractor options
  • Site access / location constraints
  • Construction timeline / schedule
  • Quality Control / Construction inspection