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Earthquakes and Structures
  Volume 16, Number 5, May 2019, pages 611-623
DOI: http://dx.doi.org/10.12989/eas.2019.16.5.611
 


Evaluation of seismic design provisions for acceleration-sensitive non-structural components
Mitesh Surana

 
Abstract
    A set of mid-rise bare and uniformly infilled reinforced-concrete frame buildings are analyzed for two different seismic intensities of ground-motions (i.e., \"Design Basis Earthquake\" and \"Maximum Considered Earthquake\") to study their floor response. The crucial parameters affecting seismic design force for acceleration-sensitive non-structural components are studied and compared with the guidelines of the European and the United States standards, and also with the recently developed NIST provisions. It is observed that the provisions of both the European and the United States standards do not account for the effects of the period of vibration of the supporting structure and seismic intensity of ground-motions and thereby provides conservative estimates of the in-structure amplification. In case of bare frames, the herein derived component amplification factors for both the design basis earthquake and the maximum considered earthquake exceeds with their recommended values in the European and the United States standards for non-structural components having periods in vicinity of the higher modes of vibration, whereas, in case of infilled frames, component amplification factors exceeds with their recommended value in the European standard for non-structural components having periods in vicinity of the fundamental mode of vibration, and only for the design basis earthquake. As a consequence of these observations, as well as capping on the design force (in case of United states standard and NIST provisions), in case of the design basis earthquake, the combined amplification factor is underestimated for non-structural components having periods in vicinity of the higher modes of vibration of bare frames, and also for nonstructural components having periods in vicinity of the fundamental mode of vibration of infilled frames. At the maximum considered earthquake demand, excepting non-structural components having periods in vicinity of the higher modes of vibration of bare frames, all provisions generally provide conservative estimates of the design floor accelerations.
 
Key Words
    RC frame buildings; seismic design; non-structural components; component amplification; in-structure amplification
 
Address
Mitesh Surana: Department of Civil Engineering, Indian Institute of Technology Ropar, Rupnagar-140001, Punjab, India
 

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