Showing papers in "Soil Dynamics and Earthquake Engineering in 2006"

TL;DR: In this paper, semi-empirical procedures for evaluating the liquefaction potential of saturated cohesionless soils during earthquakes are re-examined and revised relations for use in practice are recommended.

TL;DR: In this paper, the authors provide state-of-the-art information on the following aspects of seismic analysis and design of spread footings supporting bridge piers: (1) obtaining the dynamic stiffness (springs and dashpots) of the foundation; (2) computing the kinematic response; determining the conditions under which foundation compliance must be incorporated in dynamic structural analysis; assessing the importance of properly modeling the effect of embedment; elucidating the conditions in which the effects of radiation damping is significant.

TL;DR: In this article, a procedure to select time series for use in nonlinear analyses that are intended to result in an average response of the nonlinear system is proposed that is not based simply on magnitude, distance, and spectral shape.

TL;DR: Gerolymos et al. as mentioned in this paper developed a generalized spring multi-Winkler model for the static and dynamic response of rigid caisson foundations of circular, square, or rectangular plan, embedded in a homogeneous elastic.

TL;DR: Gerolymos et al. as mentioned in this paper developed a nonlinear Winkler-spring method for the static, cyclic, and dynamic response of caisson foundations in linear soil, where the nonlinear soil reactions along the circumference and on the base of the caisson are modeled realistically by using suitable couple translational and rotational nonlinear interaction springs and dashpots.

TL;DR: A simple approach to integration of the acceleration to acquire a realistic displacement–time series by firstly baseline-corrected in the time domain using the least-square curve fitting technique, and then processed in the frequency domain using a windowed filter to further remove the components that cause long-period oscillations in the derived displacement.

TL;DR: In this article, the authors present a design chart for pseudo-static analysis of homogeneous slopes applicable over a wide range of input parameters, and allow the designer to assess the effects of various parameters on stability.

TL;DR: In this article, the authors developed a comprehensive methodology for modeling the shear wave velocity profile in crustal rock, for purposes of seismic hazard assessment, and evaluated the significance of near-surface attenuation in bedrock.

TL;DR: In this article, two single piles, a relatively flexible pile that moves together with the surrounding soil and a relatively stiff pile that does not follow the ground movement have been subjected to large post-liquefaction ground displacement simulating piles in laterally spreading soils.

TL;DR: In this paper, the effect of random distributions of mesoscopic fluid heterogeneities on the attenuation and dispersion of wave-induced fluid flow has been studied in the frequency range from 10 to 1000 Hz.

TL;DR: In this article, an advanced formulation of the time-domain, two-dimensional hybrid finite element-boundary element method (FEM/BEM) is presented, and applied to carry out site response analysis of homogeneous and non-homogeneous topographic structures subjected to incident in-plane motions.

TL;DR: In this article, a theoretical study on the ground vibration isolation efficiency by multi-rows of piles as passive barrier in a three-dimensional context is presented, where integral equations governing Rayleigh wave scattering are derived according to the Green's solution of Lamb problem.

TL;DR: In this paper, the authors presented a comprehensive description of the various tectonic features and the association of seismicity with them to define the probable seismic sources in India and adjacent areas.

TL;DR: In this article, the instability of sand-silt mixtures with different amount of fines contents was studied and the relationship between the peak stress ratio and intergranular void ratio was described.

TL;DR: In this paper, a unified damage scale is proposed for use in both reconnaissance and assessment of all modes of building damage, including "rigid body" response of structures on stiff foundations to uniform or differential ground movements.

TL;DR: In this article, a finite element implementation of Biot's theory and two numerical applications involving the seismic behavior of saturated soil deposits are presented. But the authors focus on the nonlinear regime of saturated porous media.

TL;DR: Gerolymos et al. as discussed by the authors investigated the static, cyclic, and dynamic response of a massive caisson foundation embedded in nonlinear layered or inhomogeneous soil and loaded at its top.

TL;DR: In this article, the dispersion equation in the complex form for the Love waves in an inhomogeneous porous layer is derived and then the equation is solved by an iterative method, and the upper and lower bounds of the Love wave speed are explored.

TL;DR: In this article, the behavior of saturated sand and sloped ground subjected to flow failure with seepage of pore water in the ground after earthquake and the resultant liquefaction was evaluated.

TL;DR: In this paper, the 3D shell theory is employed in order to provide a new perspective to earthquake-induced strains in long cylindrical underground structures, when soil-structure interaction can be ignored.

TL;DR: In this article, a simple two-dimensional soil-structure interaction model, based on Biot's theory of wave propagation in fluid saturated porous media, is used to explain the observed increase of the apparent frequencies of Millikan library in Pasadena, California, during heavy rainfall and recovery within days after the rain.

TL;DR: In this article, the admissibility of four contributions characteristic for Biot's model of poroelastic materials: coupling of partial stresses, presence of relative accelerations in equations of motion, dependence of permeability on frequency and changes of porosity is demonstrated.

TL;DR: In this article, the authors discuss theoretical results from published literature regarding source selection, data-acquisition parameters, resolution of a dispersion curve image in the frequency-velocity domain, and the cut-off frequency of high modes.

TL;DR: In this article, the cyclic shear response of a channel-fill, low-plastic silt was investigated using constant-volume direct simple shear testing, and the silt specimens, initially consolidated to stress levels at or above the preconsolidation stress, displayed cyclic-mobility type strain development during cyclic loading without static shear stress bias.

TL;DR: In this article, a series of ground vibration measurements were carried out during the executions of dynamic compaction (DC) at an industrial site and the measured data included vibrations induced by standard and different tamping energies of DC.

TL;DR: In this article, a series of experiments carried out on a new 1g shaking table at Cambridge University were conducted to measure the displacements of a shallow foundation due to seismic loading and also the development of the failure mechanism within the soil.

TL;DR: In this paper, the scattering of SV waves by a canyon in a fluid-saturated, poroelastic layered half-space is modeled using the indirect boundary element method in the frequency domain.

TL;DR: In this paper, the influence of connection conditions at the head and tip of micropiles on their response to seismic loading was studied using a fully three-dimensional finite element modeling.

TL;DR: In this article, an important aspect to include in comprehensive characterization of earthquake ground motion is the duration of the shaking, which can be represented either by an interval of time during which the motion fulfils some specified criteria or else the number of effective cycles of motion.

TL;DR: In this article, the lateral resistance of a pile subjected to liquefaction-induced lateral flow was investigated and the deformation of the soil surrounding the pile when a large relative displacement between the pile and the soil is induced.