RESPONSE CHARACTERISTICS OF SOIL DEPOSITS.
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The response of layered soil deposits with variable stiffnesses to base earthquake motions was investigated. Nonlinear, strain dependent properties for modulus and damping were used to model dynamic response of the soils. The equivalent linear method as programmed in SHAKE was used for the analysis; significantly different responses were obtained for the case of a soft layer overlying a stiff layer than for the reverse situation. In homogeneous deposits, strain levels increase with depths. For nonlinear materials, this causes strain softening at depths which in turn creates reduced surface motions and increased basal strain levels.