John Hennessy III,
P.E.
by Mary Scott Nabers New York City declared a state of emergency recently because of damage from the extraordinary flash floods, which destroyed streets, devastated property and completely upended mobility. Delivering over seven inches of rain in one day, the weather event was one of the most impactful disasters ever experienced by the city. Data released […]
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MINETA TRANSPORTATION INSTITUTE
Earthquakes are a reality in both Japan and California. Seismically active areas lie near and under high-speed rail systems in Japan and along the proposed route for the California High-Speed Rail Authority’s (CHSRA) developing system. Japanese high-speed lines have withstood significant earthquakes without a single loss of life. Their experiences are instructive for California as it develops its system.
A new, rocking, pre-tensioned concrete bridge support system has been developed by the University of Washington that reduces on-site construction time and minimizes earthquake damage. The 52-ton, 70-foot-long concrete bridge, built atop three 14- by 14-foot, 50-ton-capacity hydraulically driven shake tables at the University of Nevada, Reno, was shaken in a series of simulated earthquakes, culminating in the large ground motions recorded in the deadly and damaging 1995 magnitude 6.9 earthquake in Kobe, Japan.
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