Abstract
Abstract. The objective of this paper focuses primarily on the numerical approach based on two-dimensional (2-D) finite element method for analysis of the seismic response of infinite soil-structure interaction (SSI) system. This study is performed by a series of different scenarios that involved comprehensive parametric analyses including the effects of realistic material properties of the underlying soil on the structural response quantities. Viscous artificial boundaries, simulating the process of wave transmission along the truncated interface of the semi-infinite space, are adopted in the non-linear finite element formulation in the time domain along with Newmark's integration. The slenderness ratio of the superstructure and the local soil conditions as well as the characteristics of input excitations are important parameters for the numerical simulation in this research. The mechanical behavior of the underlying soil medium considered in this prediction model is simulated by an undrained elasto-plastic Mohr-Coulomb model under plane-strain conditions. To emphasize the important findings of this type of problems to civil engineers, systematic calculations with different controlling parameters are accomplished to evaluate directly the structural response of the vibrating soil-structure system. When the underlying soil becomes stiffer, the frequency content of the seismic motion has a major role in altering the seismic response. The sudden increase of the dynamic response is more pronounced for resonance case, when the frequency content of the seismic ground motion is close to that of the SSI system. The SSI effects under different seismic inputs are different for all considered soil conditions and structural types.
Highlights
Extensive research has been produced by the great effort of several academicians and practitioners in the past three decades and observations based on the effects of previous strong earthquakes (Mexico City 1985; Loma Prieta 1989; Kobe 1995; Izmit 1999) on structural damage
In analyzing the actual structural behavior during the earthquake, it is rare case to assume that the seismic input motion, which is experienced by the base of the structure, is the same as the motion that would be obtained at the site under consideration if the structure is not present
The impact of the structural slenderness, the local soil conditions as well as the frequency content of different input motions are considered to assert the dynamic response of the vibrating soil-structure system
Summary
Extensive research has been produced by the great effort of several academicians and practitioners in the past three decades and observations based on the effects of previous strong earthquakes (Mexico City 1985; Loma Prieta 1989; Kobe 1995; Izmit 1999) on structural damage They have clearly pointed out that the seismic response behavior of many engineering structures could be significantly affected by deformability of the underlying foundation medium due to deep, soft, soil-related motion amplification (Wolf and Song, 2002). As is well known regarding the numerical discretization techniques for infinite domains, only a finite portion of the domain under consideration can be discretized, whereas in numerical treatment of wave propagation and dynamic response analysis of infinite domain, classical finite element discretization does not produce accurate results of its incapability in discretizing whole infinite domain To overcome this difficulty, several special types of artificial boundaries with different sensitivities have been proposed and developed to considerably simplify the SSI analysis in the last three decades. The impact of the structural slenderness, the local soil conditions as well as the frequency content of different input motions are considered to assert the dynamic response of the vibrating soil-structure system
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