Structural collapse of Minneapolis i-35w bridge in US on 2007 with animation video

Even one small bolt can be a reason to loss the stability of structure, if you are civil engineer, structural engineer, designer, supervisor, mason or any other field of interest you have, Even common people who use such structures have to aware about how structure being stable/unsatble and what will be the result if even small things or parts went wrong.

Bridge before collapse
Minneapolis i-35w bridge collapse on Wednesday, August 1, 2007, the eight-lane, 1,907 ft long I-35W Highway Bridge over the Mississippi River in Minneapolis, Minnesota experienced a catastrophic failure in the main span of the deck truss. Interstate 35W bridge in Minneapolis collapsed, plunging dozens of cars, trucks and road workers into the Mississippi River. Thirteen people lost their life other 145 injured. 
Joint failed first
Bridge After Collapse
Bridge was fourteen spans supported on thirteen piers carrying four lanes of traffic in each direction. The central 1,064 foot long deck truss portion of the bridge crossed the Mississippi river, and consisted of two parallel Warren type trusses with verticals. Each main truss had 56 connection points (nodes), where the vertical, horizontal, and diagonal members were joined with riveted gusset plates.

The main cause of failure is failure of one joint and then structure is unstable and fall down. Failure initiates through a bending instability in the gusset plates and a lateral shift of the upper end of the compression diagonal on two joints. The instability occurs at a critical value of the axial compression force in the diagonal coupled with a critical value of the out-of-plane displacement of the upper end of that diagonal. The bending instability is allowed to occur as a result of the widespread yielding of the gusset plates around the upper ends of the diagonals.

For Failure Animation Video click here. (Source: YouTube.)
For Animation video about structural components and all other reports you can Click HERE.
Photo: After collapse of bridge.
(Source of photos : Online webs)

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