Sabo bridge plates had 'poor fatigue resistance'

Cable diaphragm plates that cracked on the Martin Olav Sabo Bridge, leading officials to shut down the span for months this year, had "welded details that offer poor fatigue resistance," according to a 140-page report released Friday by the city of Minneapolis.
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Cable diaphragm plates that cracked on the Martin Olav Sabo Bridge, leading officials to shut down the span for months this year, had "welded details that offer poor fatigue resistance," according to a 140-page report released Friday by the city of Minneapolis.

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Related

Sabo Bridge could reopen by June

Officials say that Minneapolis is striving to reopen the Martin Olav Sabo Bridge by June 4, the Star Tribune reports. The bicycle and pedestrian span over Hiawatha Avenue has been closed for three months, after the fracture of a steel anchor led the bridge’s tallest set of cables to fall from the mast on Feb 19.

Report: Wind to blame for Sabo Bridge failure

Hennepin County and the city of Minneapolis released this press release Friday. In short, a preliminary report suggests that wind is to blame for the failure of two cable connections on the Martin Olav Sabo pedestrian and biking bridge in Minneapolis. The bridge was closed from Feb. 19 to June 1.

Inspectors find cracks on remaining cable plates on Minneapolis pedestrian bridge

A Minneapolis official says the failure on the Martin Sabo pedestrian bridge happened with what's known as a diaphragm plate. Deputy Public Works Director Heidi Hamilton tells the city council more of the plates are also cracked. She says it may take months to repair, but she's confident there is a retrofit solution.

Sabo bridge reopens to bikes, pedestrians

The Sabo bridge, which was closed after a pair of support cables broke in February, is reopening Friday afternoon to foot and bike traffic. Structural support was added underneath the bridge deck. Minneapolis is awaiting a report on what caused the cables to break loose.

Sabo reopens Friday until next repair phase

Workers installed a retrofitted diaphragm plate on the Sabo pedestrian bridge this week and the bridge reopened Friday morning, at least until more repairs are done to finish the project. Engineers will then plan and schedule repairs to the rest of the bridge’s diaphragm plates later this year.

Concerns with Minneapolis pedestrian bridge from the beginning

An engineer told the Star Tribune he noticed "high stresses" on a plate anchoring a set of cables during construction of the Sabo Bridge in 2006. The bridge was closed last month after an anchor plate cracked and caused cables to fall 100 feet.

Minneapolis bridge had passed inspection before cable broke

A major inspection of Minneapolis' Martin Sabo Bridge less than six months ago failed to turn up anything to forecast the broken cable that now has the bridge closed. With the support cable gone, Metro Transit has declilned to run light rail trains under the bridge -- creating headaches for commuters.

Sabo bridge closure costs more than $1.1M

Officials with the city of Minneapolis, Hennepin County and the Met Council told Minnesota Public Radio the cost to shutdown and repair the pedestrian and bicycle crossing topped $1.1 million. The Sabo Bridge was closed for three-and-a-half months after two of the bridge's supporting cables came loose in February. A report released in June blames the failure on wind vibrations.