So − caHed ex [ ended sway − rocking model is frequently used in the design of embedded massive stmctures . When stmctures are embedded in soft surface laycrs , the model is apt to give larger shear force in the under − ground parts thap the finite element method . In this paper, the authors have made clear through numerical survey using simplifiecl moclels that this Iendency can be a 比ribuled to the pGor estimation of side wa ] 1 impeCl − ance employed in the ordinary mode ] . The au { hors have also proposed two modified mOdels to evaluate thc side wall impedance, and proved 山 飢 the two models give more reasonable results than the ordinary sway − rocking model when foundations are embedded in soft surface strata . Keywords : seil ・ ∫' 厂uct " re interaction , sway − rocking model , e 〃 Tbedment , elastic stratu 〃1, 厂esponse analysis
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