Soil structure interaction

About: Soil structure interaction is a research topic. Over the lifetime, 3653 publications have been published within this topic receiving 48890 citations.

Nonlinear soil-pile interaction model for dynamic lateral motion

Abstract: A rational dynamic soil‐pile interaction model is presented. The model is developed adopting Winkler's hypothesis with a special attention to the conditions in which the strong nonlinearity is induced in the vicinity of the pile shaft under dynamic loading. It is formulated in a simple system of frequency independent mass, springs, and dashpots. Therefore, the model enables us to conduct the time‐domain nonlinear analysis in a relatively simple manner. Since the model can reproduce the dynamic effects by itself, its parameters are defined from the static behavior of a soil‐pile system or reasonable p‐y curves developed under the static condition. With a special consideration of a gap formed at the soil‐pile interface, the proposed model and procedure to define its parameters have successfully predicted the dynamic pile response observed in the field dynamic pile load tests. The nonlinear condition and dynamic condition are coupled with each other to produce the complex soil action to the pile shaft motion.

Kinematic pile bending during earthquakes: analysis and field measurements

Abstract: The passage of seismic waves through the soil surrounding a pile imposes lateral displacements and curvatures on the pile, thereby generating ‘kinematic’ bending moments even in the absence of a su...

Discrete numerical model for soil mechanics

Abstract: The Distinct Element Method (DEM), a numerical technique which treats soil as a discrete assemblage of particles, can be useful when local yield, bifurcation behavior or nonlinear soil‐structure interaction occurs. A two‐dimensional disk‐based implementation of the DEM is validated using numerical simulations of standard geotechnical laboratory tests, such as one‐dimensional compression, direct simple shear and triaxial tests. These test results indicate that the two‐dimensional DEM can simulate realistic nonlinear, stress history‐dependent soil behavior appropriately when individual particle rotation is inhibited.Modeling of large‐scale problems is accomplished by constructing a reduced‐scale model, then applying the geotechnical centrifuge scaling relationships in order to reduce the number of particles simulated and to ensure stress‐strain‐strength similitude between the model and prototype. Full‐scale simulations, including bearing capacity and lateral earth pressure tests, indicate that the DEM can a...

Stochastic Finite-Element Analysis of Seismic Soil-Structure Interaction

Abstract: A procedure is presented for the probabilistic analysis of the seismic soil-structure interaction problem. The procedure accounts for uncertainty in both the free-field input motion as well as in local site conditions, and structural parameters. Uncertain parameters are modeled using a probabilistic framework as stochastic processes. The site amplification effects are accounted for via a randomized relationship between the soil shear modulus and damping on the one hand, and the shear strain of the subgrade on the other hand, as well as by modeling the shear modulus at low strain level as randomly fluctuating with depth. The various random processes are represented by their respective Karhunen-Loeve expansions, and the solution processes, consisting of the accelerations and generalized forces in the structure, are represented by their coordinates with respect to the polynomial chaos basis. These coordinates are then evaluated by a combination of weighted residuals and stratified sampling schemes. The expansion can be used to carry out very efficiently, extensive Monte Carlo simulations. The procedure is applied to the seismic analysis of a nuclear reactor facility.

Cyclic macro-element for soil–structure interaction: material and geometrical non-linearities

Abstract: This paper presents a non-linear soil–structure interaction (SSI) macro-element for shallow foundation on cohesive soil. The element describes the behaviour in the near field of the foundation under cyclic loading, reproducing the material non-linearities of the soil under the foundation (yielding) as well as the geometrical non-linearities (uplift) at the soil–structure interface. The overall behaviour in the soil and at the interface is reduced to its action on the foundation. The macro-element consists of a non-linear joint element, expressed in generalised variables, i.e. in forces applied to the foundation and in the corresponding displacements. Failure is described by the interaction diagram of the ultimate bearing capacity of the foundation under combined loads. Mechanisms of yielding and uplift are modelled through a global, coupled plasticity–uplift model. The cyclic model is dedicated to modelling the dynamic response of structures subjected to seismic action. Thus, it is especially suited to combined loading developed during this kind of motion. Comparisons of cyclic results obtained from the macro-element and from a FE modelization are shown in order to demonstrate the relevance of the proposed model and its predictive ability. Copyright © 2001 John Wiley & Sons, Ltd.