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

Earthquake Spectra
By: , and 

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Abstract

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.

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Rocking behavior of an instrumented unique building on the MIT campus identified from ambient shaking data
Series title Earthquake Spectra
DOI 10.1193/032112EQS102M
Volume 30
Issue 2
Year Published 2014
Language English
Publisher Earthquake Engineering Research Institute
Contributing office(s) Earthquake Science Center
Description 16 p.
First page 705
Last page 720
Country United States
State Masachusetts
City Cambridge
Other Geospatial Massachusetts Institute of Technology campus