The successful rehabilitation of Pittsburgh’s Andy Warhol (7th Street) Bridge over the Allegheny River, part of the only trio of identical, side-by-side bridges in the world and the first self-anchored suspension spans in the United States, was ranked no. 9 on the 2018 Roads & Bridges’ Top 10 Bridges list.
Michael Baker served as the prime designer for the rehabilitation, providing preliminary engineering, final design and construction-phase services for the 90-year old historic bridge.
The bridge required rehabilitation because of accelerating age-related deterioration. The project work drew on our expertise in all areas of bridge design, construction, and preservation and included the following: bridge inspections; structural analysis and rehabilitation design; utility coordination; maintenance and protection of traffic; roadway and lighting design; paint evaluation; field surveys and public involvement.
As part of the structural analysis, our 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. The models were 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.