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• W2151131086 abstract "To study the effects of nonlinearity in the seismic response of soils, a numerical simulation of the propagation of vertically incident seismic waves in hor- izontal soil layers were performed. Shear noiselike and monochromatic seismic waves of various intensities were used as input signals. The behavior of soils was described by a nonlinear hysteretic model. To extract and study nonlinear compo- nents in the ground response, the nonlinear system identification method and analysis of higher-order spectra of oscillations on the surface were applied. Even for weak input signals, the response of the simulated soils contained a noticeable nonlinear component. An increase in the intensity of input signals led to increasing distortions of propagating signals, due to the generation and growth of combination-frequency harmonics. The results show that odd types of nonlinearity are most typical for soils, such as cubic and fifth-order nonlinearities, causing generation of the third and fifth higher harmonics of main frequencies of input signals. Nonlinearities of even types, such as quadratic, fourth-order, and sixth-order, concerned with asymmetry, or skew- ness, of oscillations (i.e., quasi-static deformations of the surface) are usually weak, except some special cases, in which a stress-strain relationship of a soil can be rep- resented by functions with noticeable even components. A weak nonlinearity results in an increase in high-frequency components, due to the generation of higher har- monics. In cases of strong nonlinearity, in which a decrease in amplification and in shear moduli become noticeable, changes in spectra of propagating signals achieve their maximum. As a result, input signals with arbitrary spectra are transformed into output signals with spectra of the type of E(f ) � f k , where k depends on the properties of the medium." @default.
• W2151131086 created "2016-06-24" @default.
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• W2151131086 date "2001-04-01" @default.
• W2151131086 modified "2023-09-27" @default.
• W2151131086 title "Nonlinear Seismic Effects in Soils: Numerical Simulation and Study" @default.
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• W2151131086 doi "https://doi.org/10.1785/0120000047" @default.
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