Seismic Simulation of an Integrated Ceiling-Partition Wall-Piping System at E-Defense. II: Evaluation of Nonstructural Damage and Fragilities
Publication: Journal of Structural Engineering
Volume 142, Issue 2
Abstract
A full-scale, 5-story steel moment frame building in base-isolated and fixed-base configurations was subjected to a number of ground motions using the E-Defense shake table. In these experiments, more than (900 ) of suspended ceiling with lay-in tiles, 90 m (300 linear ft) of partition walls with individual lengths varying from 1.5 to 9.8 m (5 to 32 ft), and three sprinkler branch lines were installed below the fifth and sixth (roof) floors of the building. Because the horizontal floor accelerations were generally constrained to relatively low values by the base isolation system, several damage states related to vertical floor system acceleration were observed. One key observation is that use of lateral bracing with compression posts did not improve the seismic response of suspended ceilings when subjected to strong vertical excitation. Acceleration amplification factors of the ceiling-partition-partition components relative to structural floor accelerations were computed. The code-prescribed amplification factors for the design of nonstructural components was consistent with the observed amplification in the horizontal direction, but unconservative in the vertical direction, because the code neglects the additional amplification produced by slab vibration.
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Acknowledgments
This material is based upon work supported by the National Science Foundation under Grant No. CMMI-0721399. This GC project to study the seismic response of nonstructural systems is under the direction of M. Maragakis from the University of Nevada, Reno and Co-PIs: T. Hutchinson (UCSD), A. Filiatrault (UB), S. French (G. Tech), and B. Reitherman (CUREE). Any opinions, findings, conclusions or recommendations expressed in this document are those of the authors and do not necessarily reflect the views of the sponsors. The input provided by the NEES Nonstructural Project Practice Committee, composed of W. Holmes (Chair), D. Allen, D. Alvarez, and R. Fleming; by the Advisory Board, composed of R. Bachman (Chair), S. Eder, R. Kirchner, E. Miranda, W. Petak, S. Rose and C. Tokas, has been critical for the completion of this research. The authors recognize and thank the following companies for providing product donations and technical support: USG Building systems, Victaulic, Tolco, Hilti, Allan Automatic Sprinkler, and CEMCO Steel.
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© 2015 American Society of Civil Engineers.
History
Received: Dec 30, 2013
Accepted: Jul 2, 2015
Published online: Sep 11, 2015
Published in print: Feb 1, 2016
Discussion open until: Feb 11, 2016
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