Project Applications

Three Sisters Bridges

Main features used in this application Construction stage analysis with composite action Suspension bridge analysis control

Description on this project

The bridges require rehabilitation because of accelerating age-related deterioration. The project work draws on Michael Baker’s expertise in all areas of bridge inspections, structural analysis and rehabilitation design, utility coordination, roadway and lighting design, paint evaluation, field surveys, and public involvement. As part of the structural analysis, the Michael Baker team developed a series of three-dimensional, finite-element models for the Andy Warhol Bridge using MIDAS, an engineering software specifically developed for bridge modeling and analysis. This marks the first time that the bridge is modeled in 3D. The models are used to establish the existing forces on the bridge, determine the new dead loads based on the proposed rehabilitation, calculate the modern-design live loads, and evaluate proposed construction sequencing.


  • Fig. midas Civil Analysis Model of Three Sisters Bridges

  • Fig. midas Civil Analysis Result Diagram of Three Sisters Bridges

Project Contact Michael Baker International
  • Address

    4100 Horizons Drive, Suite 206 Columbus, Ohio 43220, USA

  • Introduction

    Michael Baker is a global leader in engineering and consulting since 1940 to solve their most complex infrastructure challenges. Supported by 90 offices worldwide, they provide engineering consulting, specialized global construction, base operations, security management, systems integration and intelligence solutions.

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  • Email


Pittsburgh, USA


Allegheny County

General Contractor


Engineering Consultant

Michael Baker International

Construction Period

Under Rehabilitation

Type of Project

Self-anchored Suspension Bridge

Size of Structure

· Andy Warhol Bridge
135m Main Span, 323m Total Length
· Rachel Carson Bridge
120m Main Span, 303m Total Length
· Roberto Clemente Bridge
130m Main Span, 303m Total Length