{"id":133366,"date":"2024-06-24T16:24:42","date_gmt":"2024-06-24T21:24:42","guid":{"rendered":"https:\/\/uwm.edu\/news\/?p=133366"},"modified":"2024-06-27T12:40:29","modified_gmt":"2024-06-27T17:40:29","slug":"the-bridge-collapse-that-inspired-a-civil-engineering-career-for-uwms-habib-tabatabai","status":"publish","type":"post","link":"https:\/\/uwm.edu\/news\/the-bridge-collapse-that-inspired-a-civil-engineering-career-for-uwms-habib-tabatabai\/","title":{"rendered":"The bridge collapse that inspired a civil engineering career for UWM\u2019s Habib Tabatabai"},"content":{"rendered":"

When a cargo ship struck the Francis Scott Key bridge in Baltimore in March, causing it to collapse, it was a case of d\u00e9j\u00e0 vu for Habib Tabatabai, faculty member in the UWM\u2019s College of Engineering & Applied Science.<\/p>\n

An eerily similar accident happened in 1980 when Tabatabai was in graduate school. Florida\u2019s Sunshine Skyway Bridge, a steel truss bridge, collapsed after a ship hit it in foggy weather. When rebuilt, the steel truss design was discarded in favor of a different kind of bridge, called a cable-stayed bridge.<\/p>\n

\"\"
Tabatabai took this photo of Florida\u2019s Sunshine Skyway Bridge from the top of the tower during a 1987 inspection. \u201cThere is nothing like going to the top of the towers of these structures and looking around you and that feeling! So that was motivating for me.\u201d (Courtesy of Habib Tabatabai)<\/figcaption><\/figure>\n

When the new bridge opened for traffic in 1987, Tabatabai was a young engineer working for the Florida Department of Transportation, and he joined the team conducting the new bridge\u2019s first inspection. It was the beginning of his interest and career as an expert on cable-stayed bridges.<\/p>\n

The new bridge in Baltimore will likely be a cable-stayed bridge. So, it isn\u2019t surprising that Tabatabai has been interviewed by the media multiple times about the rebuilding of the Baltimore bridge \u2013 most recently by NPR<\/a>.<\/p>\n

Here he explains what distinguishes this kind of bridge and where to find them.<\/p>\n

What is a cable-stayed bridge and why is it being considered as the design for the rebuild in Baltimore?<\/strong><\/p>\n

Super long-span bridges are most suitable for suspension bridges \u2013 like the Verrazzano Narrows Bridge in New York or the Golden Gate Bridge in San Francisco. And then you have intermediate-span bridges that are best suited for the cable-stayed type.<\/p>\n

They both have some similar features. They are both cable-supported bridges and they have towers, or pylons as we call them, that help support the structure. But the arrangement of cables is different between the two.<\/p>\n

In the cable-stayed bridge, the cables support the deck directly from the pylons through straight but inclined cables running from the pylons to the deck. In a suspension bridge, a large main cable hangs in a catenary shape (draped horizontally) between the tops of the pylons and then there are vertical \u201changer\u201d cables that support deck on the main cable.<\/p>\n

Why has the steel truss bridge fallen out of favor?<\/strong>\u00a0<\/strong><\/p>\n

\"\"
In addition to cost-efficiency, the reason cable-stayed bridges have caught on is that they are more attractive than steel truss bridges, Tabatabai said. For example, the Cooper River Bridge in Charleston, S.C., (right) is shown side-by-side with the newer cable stayed bridge in 2005, before the old one was demolished. The new one is called the Arthur Ravenel Bridge. (From the Arthur Ravenel Jr. Papers\/# 0591.00 at the South Carolina Historical Society)<\/figcaption><\/figure>\n

The steel truss bridge was the go-to system in the \u201960s, \u201970s and \u201980s. But since the early 1990s, there has been a shift to the more modern cable-stayed structure because of they are more economical to build.<\/p>\n

The typical bridge contracts are based on a low-bid process. And, it turns out, that the old truss bridge requires a lot of fabrication work and a lot of materials in its construction, along with increased labor costs. That means it would no longer be the most economical option for the range of spans considered here.<\/p>\n

I call today\u2019s cable-stayed bridge design a modern, mature system. It has matured, and so it’s not a new technology that has a lot of unknowns with it.<\/p>\n

Are cable-stayed bridges just as safe as other kinds of bridges?<\/strong><\/p>\n

The structural systems are just as safe. They have the same level of resilience and the expected life as with any other bridge that has been properly maintained.<\/p>\n

Where can you see this kind of bridge structure in Wisconsin or the Midwest?<\/strong><\/p>\n

There are only small-span bridges of this kind in Wisconsin, although there are many more across the U.S. In Milwaukee, the Sixth Steet Viaduct bridge, and also the pedestrian bridge at the Calatrava Art Museum are cable-stayed. There is also another pedestrian bridge crossing I-41 in Menomonee Falls. All the newer crossings of the Mississippi River have been cable-stayed structures. In Saint Louis \u2013 the I-70 Bridge and the Clark Bridge \u2013 are examples of cable-stayed bridges.<\/p>\n","protected":false},"excerpt":{"rendered":"

When a cargo ship struck the Francis Scott Key bridge in Baltimore in March, causing it to collapse, it was a case of d\u00e9j\u00e0 vu for Habib Tabatabai, faculty member in the UWM\u2019s College of Engineering & Applied Science.<\/p>\n","protected":false},"author":836,"featured_media":133370,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":"","uwm_wg_additional_authors":[]},"categories":[174],"tags":[],"section":[141,139],"display_categories":[352,116],"related-coverage":[],"uwmnews-feed":[149],"class_list":["post-133366","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news","section-engineering","section-science-technology","display_categories-top-story-tertiary","display_categories-top-story-section","uwmnews-feed-engineering-applied-science"],"yoast_head":"\nThe bridge collapse that inspired a civil engineering career for UWM\u2019s Habib 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