Civil and Environmental Engineering
ORCID IDs
Date of this Version
1-2014
Citation
Journal of Testing and Evaluation 42:1 (January 2014), 11pp. DOI: 10.1520/JTE20130018
Abstract
Because of its simplicity, the shock response spectrum has become widely used as a means of describing the shock responses and fragilities of structures and equipment. This paper focuses on the drawbacks of using the shock response spectrum for defining equipment shock tolerance. A cantilever beam with a tip mass was used to model a hypothetical piece of equipment subjected to strong ground motion such as that caused by an explosion. 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 the total response of equipment is predominantly in the first mode can lead to significant error. Current shock spectrum procedures for equipment fragility assessment are inadequate, not only because of the physical limitations of shake table tests, but also because of the lack of a reliable analytical model.
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Engineering Science and Materials Commons, Other Engineering Commons, Risk Analysis Commons, Structural Engineering Commons
Comments
Copyright VC 2014 by ASTM International. Used by permission.