Journal of Applied Science and Engineering

Published by Tamkang University Press

1.30

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1.60

CiteScore

Alexander Y. Tuan This email address is being protected from spambots. You need JavaScript enabled to view it.1 and Chun Kuang Chen1,2

1Department of Civil Engineering, Tamkang University, Tamsui, Taiwan 251, R.O.C.
2Pacific Engineers & Constructors, Ltd., Taiwan, R.O.C. 


 

Received: December 26, 2012
Accepted: April 12, 2013
Publication Date: June 1, 2013

Download Citation: ||https://doi.org/10.6180/jase.2013.16.2.02  


ABSTRACT


Due to its simplicity, shock response spectrum has become widely used as a means of describing the shock responses and fragilities of structures and equipment. This study focuses on the drawbacks of using shock excitation response spectrum for defining equipment shock tolerance. A cantilever beam with a tip mass was used to model a hypothetical equipment, subjected to strong ground motion such as that due to an explosion or a sudden excitation. The exact solution from a detailed modal analysis shows that multiple modes of response were excited. Contributions from higher modes can be more predominant than that from the fundamental mode. Assuming that the total response of the equipment is predominantly in the first mode is erroneous. Current procedures for equipment fragility tests are inadequate, not only due to physical limitations of shake table tests, but also due to the lack of a reliable analytical model.


Keywords: Equipment, Fragility, Shock Response Spectrum, Modal Analysis, Spectral Analysis, Fast Fourier Transform


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