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World

Nevada Experiment Mimics Earthquakes to Test Bridge Designs 

Bridges are already designed not to collapse in earthquakes but often are unsafe for travel after big quakes

Kinemetrics seismograph used by United States Department of the Interior, photo: Wikimedia
By The News Whatsapp Twitter Facebook Share
4 months ago

RENO – A day after a deadly earthquake struck Mexico City, University of Nevada scientists will mimic quakes to test new bridge designs developed to help the structures better withstand violent temblors.

The engineers on Wednesday will rattle a 100-ton, 70-foot (21-meter) bridge model to see how it holds up on a giant contraption in a Reno seismology lab called a “shake table.”

Some design work by the engineers has been incorporated into a highway off-ramp under construction in Seattle. It has flexible columns and reinforcement bars made out of a metal alloy that bends and then springs back into shape when quakes hit.

Bridges are already designed not to collapse in earthquakes but often are unsafe for travel after big quakes.

The research team’s leader, Professor Saiid Saiidi, said the the innovations in the model being tested involve connections and material known as ultra-high performance concrete.

The elements have been tested on their own but never before combined in a bridge model subjected to realistic earthquake motions, like the 1994 Northridge, California quake.

The University of Nevada’s Earthquake Engineering Lab is the largest of its kind in the United States.

The scientists’ project is funded by the California Department of Transportation.

SCOTT SONNER

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