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Proceedings Paper

Study of ground effects on building foundation vibration using two-dimensional real-mode finite element analysis
Author(s): William B. Rockwood
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Paper Abstract

The utility and limitations of two-dimensional Finite Element Analysis (FEA) of building foundation vibration characteristics using real eigenvalues is investigated. While concentrated dampers are often used to model radiation away from the ground model boundary, they introduce a non-proportional damping matrix and thus complex modes. This type of analysis is beyond the capability of many desktop FEA packages. The results of real mode (uniformly distributed damping) plane strain calculations of vibration transmission across typical building foundations are discussed, along with the various factors effecting their validity. These factors include: the extent of ground which must be modeled; the damping loss factor which must be applied in order to limit the effects of reflection from the boundaries (and how this relates to the ground extent); the element grid size; and the number of modes used in the modal superposition. The limited results obtained to date results show that real mode analysis, properly interpreted, can be useful in predicting the differences between alternate foundation designs as regards their vibration characteristics.

Paper Details

Date Published: 1 February 1992
PDF: 16 pages
Proc. SPIE 1619, Vibration Control in Microelectronics, Optics, and Metrology, (1 February 1992); doi: 10.1117/12.56842
Show Author Affiliations
William B. Rockwood, Colin Gordon & Associates (United States)


Published in SPIE Proceedings Vol. 1619:
Vibration Control in Microelectronics, Optics, and Metrology
Colin G. Gordon, Editor(s)

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