Bridge 9340 collapse pdf

Check out this amazing footage of the collapse of the worlds third largest suspension bridge at the time, tacoma narrows bridge, washington, in 1940. The research involved installation on both the main trusses and the floor truss to measure the liveload stress ranges. Fatigue evaluation of the deck truss of bridge 9340. The bridge opened in 1967 and was minnesotas third busiest, carrying 140,000 vehicles daily. Why the gusset plates of i35w bridge are undersized. Urs purposefully lured the state, which relied on the engineering behemoths claimed expertise, into a false sense of security about the bridges structural integrity and the safety of the public using it.

I35 bridge collapse analysis writing down goals is a key starting point for any root cause analysis. Oct 11, 2019 bridge 9340 collapse pdf august 1, shortly after 6 pm, the iw bridge collapses with motor that resulted in undersized gusset plates on some of bridge s main trusses. In that time, minnesota and other states have become more rigorous about inspecting and maintaining their bridges. Minneapolis bridge collapse lessons learned from the 35w bridge collapse by sea stachura, minnesota public radio july 31, 2009 minneapolis its been two years since the collapse of the i 35w bridge in downtown minneapolis. Ballarini and okazaki 2010 meaning that if one part of the bridge fails the entire bridge might collapse. Construction on the bridge began in 1964, towards the end of the national highway construction boom that aimed to dramatically develop the roadway infrastructure of the united states.

Minneapolis bridge collapse lessons learned from the 35w. I35w bridge bridge background bridge completed in 1967 1907 feet long 3 span continuous truss main span 456 2 trusses 11 approach spans continuous steel multi beam continuous concrete slabs adt 141,000 4 lanes each direction structurally deficient sr 50. Collapse investigation, final report, november 2008. Bridge 9340 supports four lanes in each direction eight lanes total of 5w across the mississippi river just east of downtown minneapolis. City of minneapolis i35w bridge collapse information. Constructed in 1967, the bridge has 14 spans, with a total length of 1,907 feet. Pdf the i35 bridge over the mississippi river in minneapolis, minnesota catastrophically failed during the evening rush hour on august 1, 2007. A preliminary analysis of the bridge 9340 collapse at august 1st, 2007 and some suggestions.

No reason for the collapse was immediately apparent. Advanced analysis and computing innovation and invention acii wilmette, il 60091. Minneapolis interstate 35w bridge collapse minnesota issues. We can infer, therefore, that if the gusset plates had been. Pdf i35w mississippi river bridge failure is it a wake up call. Using load testing to save money and time on the i35w bridge. View of the collapsed i35w bridge bridge 9340 on august 1, 2007. Us bridges have gotten some attention for potential structural issues. The i35w mississippi river bridge was an eightlane, steel truss arch bridge that carried. Selections from the plans for bridge 9340 from the files of the minnesota dept. Bridge 9340 consists ofa deck truss and steel multigirderapproach spans built in.

The diagram shows the nature of the internal forces click on it to open a larger version in a new window with further explanation. Introduction to bridge engineering drexel university. Bridge 9340 i35 crossing mississippi river bridge debris in river 140,000 vehicles day. The i35w mississippi river bridge officially known as bridge 9340 was an eightlane, steel truss arch bridge that carried interstate 35w across the mississippi river in minneapolis, minnesota, united states. Minneapolis bridge collapse investigation update aug. Its built by contractors industrial construction co. By definition, the law states that for every force exerted on an object, there is an equal and opposite reaction force. Recently published preliminary results on the collapse of the 9340 bridge 55, indicate as the probable cause for the failure a combination of situations that include an inadequate load capacity of. Our hearts continue to go out to the victims, families and others affected by the collapse. The bridge collapse in minneapolis is north dakota safe. Minneapolis bridge collapse investigation updateaug.

Originally constructed in 1967 with a 50year design life, bridge 9340 the i35w bridge designation was an eightlane, steel arch truss with 14. Thirteen people, 8 men and 5 women, died and 145 were injured. I35w highway bridge collapse college of engineering. Apr 15, 2019 bridge 9340 collapse pdf august 1, shortly after 6 pm, the iw bridge collapses with motor that resulted in undersized gusset plates on some of bridge s main trusses. Minneapolis interstate 35w bridge collapse minnesota. This report is based on the ntsbs finding released at jan. On august 1, 2007 a failure in the river span of the deck truss caused a complete collapse. Collapse of i35w highway bridge, minneapolis, minnesota, august 1, 2007. Ntsb 2007, modeling group study 07115, loads on the bridge at the time of the accident, national transportation safety board, washington, d. A deck resurfacing project, underway when the bridge collapsed, was. A preliminary analysis of the bridge 9340 collapse at. Bridge collapse resulted in a 6hour detour to get from one side of big sur to the other side, effectively splitting the community in half.

The cause of collapse was found to be the failure of the gusset plates at connections l11 and u10, which well agreed with the field. According to the recent investigation june 2006 conducted by the minnesota department of. The average daily traffic adt is given as 15,000 in each direction, with ten percent trucks. Pdf study of the i35w highway bridge collapse mechanism. Aem provided the cause of collapse of the i35w bridge. The i35w mississippi river bridge officially designated.

After the collapse, the bridge was lodged in the river where, under minnesota statute, the hennepin county. The bridge was owned by the federal government, and was operated and maintained by the state of minnesota. The ntsb cited a design flaw as the likely cause of the collapse, noting that a toothin gusset. Contractor employees and mndot inspectors on bridge at collapse. The bridge, officially designated bridge 9340, was designed by sverdrup. The minneapolis star, november 17, 1964 pdf 3 mb the minneapolis star, july 5, 1966 pdf 1. The collapse sent 111 vehicles, as well as construction workers, equipment and materials 115 feet 35 m down to the river or its banks. Jan 25, 2018 the dependency of bridgecollapse on u10failure is further corroborated, if indirectly, by analysts observation that bridge 9340 was fracture critical holth 2011. Fatigue evaluation of the deck truss of bridge 9340 minnesota dept. From there, the key is to ask why something happened and we can trace the incidents causes to create a cause map, an extremely effective root cause analysis tool.

Collapse of the i35w bridge marnie mcgrath page 1 introduction during evening rushhour on august 1, 2007, u. In the bridge, iw over mississippi river, fatigue evaluation and. Bridge 9340 is a deck truss with steel multigirder approach spans built in 1967 across the mississippi river just east of downtown minneapolis. Bridge 9340 is a deck truss with steel multigirder approach spans built in 1967 across. According to eyewitnesses, the collapse occurred immediately after loud cracking sounds were heard coming from the ohio span temperature at the time of collapse was 30o f 46 persons were killed, 9 persons were injured, and 37 vehicles fell with the bridge. Therefore, a computational study was conducted on the condition of the u10 gusset plates at the time of bridge collapse. How the minnesota department of transportation turned the. Reported evidence suggests that failure of gusset plates initiated the collapse of the i35w bridge in minneapolis, minnesota. Pdf the design details of the i35w mississippi river bridge, major bridge failures, and its impact on. Using load testing to save money and time on the i35w. A research report published in march 2001, based on site studies conducted during 1999 and 2000fatigue evaluation of the deck truss of bridge 9340 available here.

China bridge collapse caught on camera, chaos as people tumble into water duration. Collapse of the i35w bridge in minneapolis and how. I35 bridge collapse thinkreliability, case studies. It was replaced with a 310footlong span steel bridge that opened to traffic on october 2017. The i35w bridge over the mississippi river in minneapolis, mn had 14 spans and a total length of 1,907 feet. The primary structure of this bridge was a variable depth steel deck truss of 1,064 feet in length that carried i35w over the river and gorge. Some structural engineering experts have even suggested that up to 8000 us bridges are in need of remodeling. The dependency of bridgecollapse on u10failure is further corroborated, if indirectly, by analysts observation that bridge 9340 was fracture critical holth 2011. The particular gusset plates were at a panel point designated as u10. During the evening rush hour on august 1, 2007, it suddenly collapsed, killing people and injuring 145. Critical failure insights and analysis into the minneapolis bridge collapse, roberts, charles jr. The incident took place while at bridge 9340 in minneapolis, minnesota, which crossed.

The approach spans have exhibited several fatigue problems. Bridge collapse in mn structural engineering general. August 1, shortly after 6 pm, the iw bridge collapses with motor that resulted in undersized gusset plates on some of bridge s main trusses. While the explanation for this bridges collapse may seem obvious up to this point, it would not be complete without understanding sir isaac newtons third law of motion. It had a catastrophic failure during the evening rush hour on. Bridge 9340 consists ofa deck truss and steel multigirderapproach spans built in 1967. This research project resulted in a new, accurate way to assess fatigue cracking on bridge 9340 on 5, which crosses the mississippi river near downtown minneapolis. Bridge 9340, which opened in 1967, was an eight lane.