By Patrick Nunnally, Roberto Ballarini, Minmao Liao, Thomas Fisher
On August 1, 2007, simply after 6:00 p.m., throughout the night rush hour in Minneapolis, the 1,900-foot-long, eight-lane I-35W bridge buckled and crashed into the Mississippi River. The incredible had occurred correct at the doorstep of the collage of Minnesota dual towns campus. a few of the first responders have been from the collage, persevering in the course of chaos and disbelief. within the resulting weeks, study and engineering groups from the collage reviewed the wreckage, sought for explanations, and commenced making plans for the longer term. town, the River, the Bridge represents one other set of responses to the catastrophe. Stemming from a 2008 college of Minnesota symposium at the bridge cave in and the development of a brand new bridge, it addresses the ramifications of the catastrophe from the views of background, engineering, structure, water technology, community-based journalism, and geography. individuals learn the standards that resulted in the cave in, the teachings discovered from the catastrophe and the reaction, the coverage and making plans alterations that experience happened or are inclined to take place, and the effect at the urban and the Mississippi River. town, the River, the Bridge demonstrates the University's dedication to matters that trouble the neighborhood and stocks insights on public questions of urban construction, infrastructure, and layout coverage. members: John O. Anfinson; Roberto Ballarini; Heather Dorsey; Thomas Fisher; Minmao Liao; Judith A. Martin; Roger Miller; Mark Pedelty; Deborah L. Swackhamer; Melissa Thompson.
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Additional resources for The City, the River, the Bridge: Before and after the Minneapolis Bridge Collapse
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2 Under a designbuild scenario, contractors who are bidding to get the contract to do the job propose how they will approach the work. In the case of a bridge replacement like the i-35w bridge project (now termed the St. Anthony Falls Bridge), mn/dot would give contractors a series of engineering problems and standards that the new bridge would be required to meet. How the contractors chose to solve the given problems and achieve the set standards was the subject of the bid. For instance, a firm with expertise and experience in steel bridge construction could propose a steel bridge, while another could choose concrete if it felt that was a better way to approach the job.
In other words, rather than buying the cheapest bridge, which could be built in the shortest possible time, mn/dot, acting through a collaborative, fully audited process, selected the bridge proposal best suited to its needs rather than the cheapest possible. In retrospect, from a perspective after the global economic difficulties that were starting in 2007 and accelerated so spectacularly in 2008, this logic may be questionable. But under the pressures of a collapsed bridge, snarled traffic, neighborhoods and politicians demanding solutions, and public confidence in the department being questioned, the decision makes more sense.
This design paradigm is referred to as allowable stress design, and it demands (and if performed correctly guarantees) that all components will remain elastic under ser- D vice conditions. 0 to each structural component, which means that the gusset plates should be designed to remain elastic even if they are subjected to forces twice those expected. E As explained through the computer analyses described in the next section, for some unknown reason the gusset plates at node u10 were designed incorrectly.