Bridge 9340 collapse pdf

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. Fatigue evaluation of the deck truss of bridge 9340 minnesota dept. Constructed in 1967, the bridge has 14 spans, with a total length of 1,907 feet. The i35w mississippi river bridge officially designated.

The approach spans have exhibited several fatigue problems. The dependency of bridgecollapse on u10failure is further corroborated, if indirectly, by analysts observation that bridge 9340 was fracture critical holth 2011. 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. A preliminary analysis of the bridge 9340 collapse at. Aem provided the cause of collapse of the i35w bridge.

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 bridge. Bridge 9340 consists ofa deck truss and steel multigirderapproach spans built in. No reason for the collapse was immediately apparent. Bridge 9340 is a deck truss with steel multigirder approach spans built in 1967 across. During the evening rush hour on august 1, 2007, it suddenly collapsed, killing people and injuring 145. Ntsb 2007, modeling group study 07115, loads on the bridge at the time of the accident, national transportation safety board, washington, d. 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. Minneapolis interstate 35w bridge collapse minnesota.

It had a catastrophic failure during the evening rush hour on. The i35w mississippi river bridge officially known as bridge 9340 was an eightlane, steel truss arch bridge that carried interstate 35w across the saint anthony falls of the mississippi river in minneapolis, minnesota, united states. 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. Selections from the plans for bridge 9340 from the files of the minnesota dept. The diagram shows the nature of the internal forces click on it to open a larger version in a new window with further explanation. The bridge was constructed in 1967 and consisted of 14span steel deck trusses. Collapse of the i35w bridge in minneapolis and how. 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. Using load testing to save money and time on the i35w. Check out this amazing footage of the collapse of the worlds third largest suspension bridge at the time, tacoma narrows bridge, washington, in 1940. Bridge 9340 i35 crossing mississippi river bridge debris in river 140,000 vehicles day. Minneapolis bridge collapse lessons learned from the. 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.

Our hearts continue to go out to the victims, families and others affected by the collapse. China bridge collapse caught on camera, chaos as people tumble into water duration. Its built by contractors industrial construction co. Minneapolis bridge collapse investigation updateaug. Minneapolis bridge collapse lessons learned from the 35w. Pdf study of the i35w highway bridge collapse mechanism. I35w highway bridge collapse college of engineering. The i35w mississippi river bridge was an eightlane, steel truss arch bridge that carried. Introduction to bridge engineering drexel university. On august 1, 2007 a failure in the river span of the deck truss caused a complete collapse.

The particular gusset plates were at a panel point designated as u10. 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. This report is based on the ntsbs finding released at jan. The bridge collapse in minneapolis is north dakota safe. The collapse sent 111 vehicles, as well as construction workers, equipment and materials 115 feet 35 m down to the river or its banks. Contractor employees and mndot inspectors on bridge at collapse. The average daily traffic adt is given as 15,000 in each direction, with ten percent trucks. Collapse of i35w highway bridge, minneapolis, minnesota, august 1, 2007. 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. Minneapolis bridge collapse investigation update aug. According to the recent investigation june 2006 conducted by the minnesota department of. Collapse of the i35w bridge marnie mcgrath page 1 introduction during evening rushhour on august 1, 2007, u. The weather that day was calm and traffic was moving more slowly than usual because.

The i35w bridge over the mississippi river in minneapolis, mn had 14 spans and a total length of 1,907 feet. Microsoft powerpoint i35 bridge collapse and response. Therefore, a computational study was conducted on the condition of the u10 gusset plates at the time of bridge collapse. A deck resurfacing project, underway when the bridge collapsed, was. I35 bridge collapse analysis writing down goals is a key starting point for any root cause analysis. Collapse of i35w highway bridge minneapolis, minnesota. Bridge 9340 consists ofa deck truss and steel multigirderapproach spans built in 1967. 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. 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. By definition, the law states that for every force exerted on an object, there is an equal and opposite reaction force. Collapse investigation, final report, november 2008. After the collapse, the bridge was lodged in the river where, under minnesota statute, the hennepin county.

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. Us bridges have gotten some attention for potential structural issues. 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. Critical failure insights and analysis into the minneapolis bridge collapse, roberts, charles jr. I35 bridge collapse thinkreliability, case studies. 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. In the bridge, iw over mississippi river, fatigue evaluation and. Some structural engineering experts have even suggested that up to 8000 us bridges are in need of remodeling. Thirteen people, 8 men and 5 women, died and 145 were injured. Pdf i35w mississippi river bridge failure is it a wake up call. Minneapolis interstate 35w bridge collapse minnesota issues. The bridge opened in 1967 and was minnesotas third busiest, carrying 140,000 vehicles daily.

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. A preliminary analysis of the bridge 9340 collapse at august 1st, 2007 and some suggestions. 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 minneapolis star, november 17, 1964 pdf 3 mb the minneapolis star, july 5, 1966 pdf 1. Highway bridge 9340 in minneapolis collapsed, killing people and injuring 145. It was replaced with a 310footlong span steel bridge that opened to traffic on october 2017. The ntsb cited a design flaw as the likely cause of the collapse, noting that a toothin gusset. Bridge 9340 supports four lanes in each direction eight lanes total of 5w across the mississippi river just east of downtown minneapolis. 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. City of minneapolis i35w bridge collapse information. In that time, minnesota and other states have become more rigorous about inspecting and maintaining their bridges. How the minnesota department of transportation turned the. The inelastic behavior of the deck truss during the collapse event is studied in this research by performing. Why the gusset plates of i35w bridge are undersized.

The bridge, officially designated bridge 9340, was designed by sverdrup. The research involved installation on both the main trusses and the floor truss to measure the liveload stress ranges. Bridge collapse in mn structural engineering general. Fatigue evaluation of the deck truss of bridge 9340. Pdf the i35 bridge over the mississippi river in minneapolis, minnesota catastrophically failed during the evening rush hour on august 1, 2007. The incident took place while at bridge 9340 in minneapolis, minnesota, which crossed. However, the last truly fatal major us bridge collapse occurred in 2007. Ballarini and okazaki 2010 meaning that if one part of the bridge fails the entire bridge might collapse. Advanced analysis and computing innovation and invention acii wilmette, il 60091. The bridge was owned by the federal government, and was operated and maintained by the state of minnesota. Sep 08, 2019 the bridge deck is designed as a metal structure and consists of a central platform and hexagonal anchorages where the cables attach.

We can infer, therefore, that if the gusset plates had been. Bridge 9340 is a deck truss with steel multigirder approach spans built in 1967 across the mississippi river just east of downtown minneapolis. 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. Originally constructed in 1967 with a 50year design life, bridge 9340 the i35w bridge designation was an eightlane, steel arch truss with 14.