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Modjeski and Masters is pleased to announce the acquisition of structural engineering firm Summit Engineering Group, Inc. Our combined engineering prowess and respective technical skillsets will enable us to provide streamlined design and construction solutions to best meet client needs.

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New Findlay Connector Girder Bridges

| View Projects: Findlay Township, PA

  • Client:

    Pennsylvania Turnpike Commission
  • Service:

    Medium and Short Span Bridges
  • Status:

    Completed
  • Award Winner
  • Overview

    Designing and constructing a new expressway has its own set of challenges – complying with environmental regulations, managing the expectation of affected stakeholders, and traversing the pristine terrain with a cost-effective facility. Those were just a few of the challenges the Pennsylvania Turnpike Commission (PTC) faced when developing the Southern Beltway, a 32-mile long expressway with a radius of approximately 15 miles out from Pittsburgh’s Golden Triangle. The first six miles of the Southern Beltway, referred to as the Findlay Connector, extend south from Route 60 at the Pittsburgh International Airport to Route 22. The alignment called for a new major crossing over an existing steep stream valley.

    The PTC selected a team which featured the experienced and trusted firm of Modjeski and Masters to design the challenging structure. Working with the public and affected stakeholders, our creative bridge engineers developed five alternatives in both concrete and steel, for this $6.5 million, 600-foot crossing. The selected alternative features piers with heights approaching 100 feet, dual structures, aesthetically-appealing tulip-shaped piers, and a three-span continuous steel plate girder superstructure. M&M developed the span arrangement for a reduced number of piers to minimize the bridge footprint, ultimately reducing the environmental impact. Our technical experts utilized high performance steel for the girder design – a material with added value due to its lower future maintenance costs. Our forward-thinking engineering team sized the substructure to accommodate future widening with minimal impact on the environment, traveling public, and the aesthetics of the structure.

    This project continues our long term relationship with the PTC which began in the late 1930s. Since the completion of the Findlay Connector Bridges, the Commission again turned to Modjeski and Masters to design Section 53D of the Mon-Fayette Expressway, the crown jewel of the 24-mile expressway which features a long span bridge over the Monongahela River.
  • Description

    Tasks Performed
    • New Structure –Design (Preliminary & Final)
    • Structural Analysis
    • Construction Administration

    Bridge Geometry
    • Length of Main Span – 235 feet
    • Total Project Length – 618 feet
    • # Lanes on Structure – Two lanes in each direction
  • Testimonial

    The selected alternative features piers with heights approaching 100 feet, dual structures, aesthetically-appealing tulip-shaped piers, and a three-span continuous steel plate girder superstructure.
  • Credits

    John M. Kulicki, PhD, PE, SE (Principal-In-Charge)
    Michael J. Borzok, PE (Lead Bridge Engineer)