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Rocking behavior of an instrumented unique building on the MIT campus identified from ambient shaking data

January 1, 2014

A state-of-the-art seismic monitoring system comprising 36 accelerometers and a data-logger with real-time capability was recently installed at Building 54 on the Massachusetts Institute of Technology's (MIT) Cambridge, MA, campus. The system is designed to record translational, torsional, and rocking motions, and to facilitate the computation of drift between select pairs of floors. The cast-in-place, reinforced concrete building is rectangular in plan but has vertical irregularities. Heavy equipment is installed asymmetrically on the roof. Spectral analyses and system identification performed on five sets of low-amplitude ambient data reveal distinct and repeatable fundamental translational frequencies in the structural NS and EW directions (0.75 Hz and 0.68 Hz, respectively), a torsional frequency of 1.49 Hz, a rocking frequency of 0.75 Hz, and very low damping. Such results from low-amplitude data serve as a baseline against which to compare the behavior and performance of the building during stronger shaking caused by future earthquakes in the region.

Citation Information

Publication Year 2014
Title Rocking behavior of an instrumented unique building on the MIT campus identified from ambient shaking data
DOI 10.1193/032112EQS102M
Authors Mehmet Çelebi, Nafi Toksöz, Oral Büyüköztürk
Publication Type Article
Publication Subtype Journal Article
Series Title Earthquake Spectra
Index ID 70192822
Record Source USGS Publications Warehouse
USGS Organization Earthquake Science Center

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