Building Structures- Case Studies & Concepts

5003-1 - On a Rock Site: Seismic Improvements at the Alcatraz Cellhouse

Friday, April 20
1:30 PM - 3:00 PM
Location: 203BC

The Cellhouse is a one-to-three story concrete building located on weathered sandstone at Alcatraz Island in San Francisco Bay. Construction of the building began in 1909 with the partial demolition of the 1850s era brick-masonry Citadel, the lower floor of which remained below as a dungeon. Since its completion in 1912, the building has served as a military prison, a federal penitentiary, and a nexus for the Native American Movement during the Occupation of Alcatraz. Since 1972, the entire island has been preserved, currently being designated a National Historic Landmark and National Park. Over the last twenty years, various seismic improvements have been constructed in the Cellhouse including the addition of reinforced concrete shear walls and collectors in the basement Citadel, FRP strengthening of the roof diaphragm, and rehabilitation of deteriorated pilasters with additional transverse steel. In this presentation, the structural history of the building will be discussed, as well as a seismic retrofit of the three-story Hospital Wing of the Cellhouse that is currently being designed.

Owen Rosenboom

Associate Principal
Wiss, Janney, Elstner Associates, Inc.

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5003-1 - On a Rock Site: Seismic Improvements at the Alcatraz Cellhouse



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