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| I-40 Mississippi River Bridge Retrofit, Tennessee |
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| The I-40 Bridge over the Mississippi River is a vital transportation, commercial and defense link in the Memphis area. It is situated at the southeastern edge of the New Madrid Seismic Zone, where 3 of the largest earthquakes in the Central United States occurred in the 1800’s. It was retrofitted with Friction PendulumTM isolation bearings designed to withstand a magnitude 7 earthquake occurring on the New Madrid fault. Retrofitting the 40 year old bridge with Friction PendulumTM bearings will allow it to remain operational after an extreme earthquake event. |
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| The Friction PendulumTM seismic isolation design strategy resulted in construction cost savings of over $16 million compared to a conventional retrofit. These cost savings were realized through minimizing strengthening of the superstructure, piers and foundations. |
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