Three Sisters Bridges

Pittsburgh, USA

Main features used in Three Sisters Bridges
  • Construction stage analysis with composite action
  • Suspension bridge analysis control
Project Information
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 Bridge135m Main Span, 323m Total Length· Rachel Carson Bridge120m Main Span, 303m Total Length· Roberto Clemente Bridge130m Main Span, 303m Total Length
Pittsburgh, USA
Used Product
  • Modeling
  • Result
  • Drawing/Report
  • Panorama

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.

Project Contact
Engineering Consultant
Michael Baker International
4100 Horizons Drive, Suite 206 Columbus, Ohio 43220, USA
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.