Seismic Evaluation of the Type L and San Luis Obispo Braced Frame FAA Airport Traffic
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Seismic Evaluation of the Type L and San Luis Obispo Braced Frame FAA Airport Traffic
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Seismic Evaluation of the Type L and San Luis Obispo Braced Frame FAA Airport Traffic Control Towers

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James Wilcoski, Ernest Heymsfield, James Horne, George Manning, and Matthew Walters

US Army Corps
of Engineers
Construction Engineering
Research Laboratories

USACERL Technical Report 99/04
November 1998

81 Pages

This report presents a detailed seismic evaluation of the FAA Airport Traffic
Control Towers (ATCTs) located in Palo Alto, Salinas, San Carlos and San Luis
Obispo, CA. The San Luis Obispo tower is a unique, eccentrically braced steel
frame tower. The three other towers are Type L towers, which are reinforced
concrete-frame structures. Each was evaluated based on the maximum considered
earthquake defined by 1997 National Earthquake Hazards Reduction Program
(NEHRP) Recommended Provisions (FEMA 302). Type L and the San Luis
Obispo towers were evaluated based on several directions of loading and an extreme
assumption that the cab windows do not fail and work as fully effective
shear walls.

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