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The investigation revealed that photos from a June 2003 inspection of the bridge showed gusset-plate bowing. [126] [127] On November 13, 2008, the NTSB released the findings of its investigation. The primary cause of the collapse was the undersized gusset plates, at 0.5 inches (13 mm) thick.
The most notable bridge failure due to gusset plates is the collapse of I-35W Mississippi River bridge in Minneapolis, Minnesota on August 1, 2007. Investigators found that the bridge had 16 under-designed gusset plates that fractured and ripped, and that the remaining gusset plates were properly designed and remained intact.
The Blatnik Bridge was reduced to two lanes temporarily until the gusset plates could be strengthened. In November 2011, both the Minnesota and Wisconsin departments of transportation installed new signs to remind drivers that trucks over 40 short tons (36 t) gross vehicle weight cannot use the Blatnik Bridge; these vehicles will be rerouted to ...
The design uses Warren trusses and is centred on a series of gusset plates that allow the direct attachment of the longitudinal, diagonal, vertical, and cross framing members. Centralised connection points increase the speed of construction and allow identical panels to be fabricated from identical members and then installed on site.
Hardy Bridge is a Warren through truss, three-span, two-lane bridge in the western United States. It crosses the Missouri River and is located at milepost 6 on Old U.S. Route 91 , about fourteen miles (23 km) southwest of Cascade, Montana , which is southwest of Great Falls .
The three bridges have a design similar to that of the former I-35W bridge. [1] The bridge was inspected on August 3, 2007 and found to be structurally sound. [2] However, on March 20, 2008, four gusset plates were found to be bent. The bridge was closed indefinitely as a precaution and demolished in October 2008.
On May 17, 2008, the United States Postal Service announced that the bridge would be on the Minnesota sesquicentennial commemorative stamp. [1] Following an inspection of the bridge's gusset plates, the Minnesota Department of Transportation closed the bridge on June 3, 2008, with over 60-mile-long (97 km) detours as an alternative. [2]
The bridge was built in 1955, as part of the state government's upgrades to the U.S. Route 99 corridor and a year before the Interstate Highway System was begun. The bridge carries four lanes of traffic, two lanes in each direction separated by a median barrier. The portions over the river are four consecutive spans, each 160 feet (49 m) long.