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Effect of soil‐structure interaction on damping of structures
Author(s) -
Novak M.,
Hifnawy L. El
Publication year - 1983
Publication title -
earthquake engineering and structural dynamics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.218
H-Index - 127
eISSN - 1096-9845
pISSN - 0098-8847
DOI - 10.1002/eqe.4290110503
Subject(s) - dissipation , soil structure interaction , vibration , modal , foundation (evidence) , eigenvalues and eigenvectors , structural engineering , energy (signal processing) , simple (philosophy) , damping ratio , normal mode , engineering , mathematics , physics , finite element method , materials science , acoustics , history , philosophy , statistics , archaeology , epistemology , quantum mechanics , polymer chemistry , thermodynamics
Damping of structures resting on flexible foundations is affected by soil‐structure interaction in two ways: (1) the structure gains damping through energy dissipation in soil, and (2) the damping the structure would have on a rigid foundation is reduced. These effects are evaluated using two approaches: an energy consideration which is a simple but approximate approach, and the complex eigenvalue analysis which is mathematically accurate but uses damped, non‐classical vibration modes. These two methods are compared and the accuracy of the more convenient energy approach is assessed. Examples of modal damping are given for rigid structures, buildings and towers.