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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.
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From the City of Minneapolis and Hennepin County:

The Sabo bike and pedestrian bridge over Hiawatha Avenue will reopen early Friday morning, Aug. 24. Crews began the first phase of repair to the bridge earlier this week, and as that work wraps up, the bridge can reopen until the next phase of repairs begins.

A pair of support cables broke loose on the bridge last winter, and this week, crews installed one retrofitted diaphragm plate on the bridge, which crosses over Hiawatha Avenue in south Minneapolis. The repair to the plate will be monitored over the next month to see how it performs. Engineers will then plan and schedule repairs to the rest of the bridge’s diaphragm plates later this year.

One of the bridge’s diaphragm plates fractured in February, causing a pair of suspension cables to break loose. Wiss, Janney, Elstner Associates, Inc., an engineering firm hired to find the cause of the fracture, concluded in June that wind-induced cable vibrations caused fatigue cracking in the diaphragm plates resulting in two cable connections fracturing. The retrofitted plate installed this week is designed to withstand the fatigue that caused the cracking.

The retrofitted diaphragm plate connects one pair of cables on the Sabo Bridge. This particular pair is the third longest set of cables in the bridge design, and they are the longest cables currently attached to the bridge pylon.

To wrap up this week’s work, both directions of Hiawatha Avenue between East 26th Street and East 28th Street will close to traffic starting at 8 p.m. Thursday, Aug. 23. The highway is scheduled to reopen by 5 a.m. Friday. Drivers will need to follow the posted detour routes.

The Sabo Bridge is a 215 foot-long cable-stayed suspension bridge that opened in November of 2007 to carry Midtown Greenway bicycles and pedestrians over Hiawatha Avenue. The bridge was built by Hennepin County and turned over to the City of Minneapolis when construction was completed.

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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.

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.

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.

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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.

Minneapolis considers re-opening Sabo bridge during repairs

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Sabo bridge closure costs more than $1.1M

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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.