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ESTIMATING MODAL PARAMETERS FOR A SIMPLE SOFT‐SOIL SITE HAVING A LINEAR DISTRIBUTION OF SHEAR WAVE VELOCITY WITH DEPTH
Author(s) -
ZHAO J. X.
Publication year - 1996
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/(sici)1096-9845(199602)25:2<163::aid-eqe544>3.0.co;2-8
Subject(s) - modal , shear (geology) , bedrock , excitation , half space , mechanics , geology , geotechnical engineering , physics , materials science , geometry , mathematics , petrology , quantum mechanics , geomorphology , polymer chemistry
Simple approximate expressions are derived for estimating equivalent modal parameters of a single soft‐soil layer that has a straight line distribution of shear wave velocities and is on a flexible half space which is more rigid than the overlying soil layer. It is shown that radiation damping from the flexibility of the half space can be converted approximately into an equivalent material damping and that a site of a single soft‐soil layer on a flexible half space can be replaced by an equivalent single layer, with the same shear wave velocity distribution, on a rigid bedrock. The implementation for modal analyses and non‐linear analyses of the equivalent site under earthquake excitation is discussed.