Showing papers in "Soil Dynamics and Earthquake Engineering in 1999"

TL;DR: A database of earthquake-induced landslides has been compiled which extends the work of Keefer (Keefer DK), who covered the period 1811-1980 to 1997 as mentioned in this paper.

TL;DR: In this paper, the three-dimensional problem of isolation of vibration by a row of piles is studied numerically on the basis of a model replacing the rows of piles by an effective trench in order to reduce the modelling complexity.

TL;DR: In this article, a vector-based GIS was developed that employs a rigorous approach to Newmark's displacement method for assessing earthquake triggered landslide hazards, which is suitable for large scales to model various seismic scenarios and their effect on seismically induced landslide potential.

TL;DR: In this article, a dynamic finite element code implementing the equivalentlinear soil behavior (FLUSHPLUS) was used for the analyses and it was found that the step-like topography amplified greatly the intensity of motion without affecting its frequency content.

TL;DR: In this paper, the authors performed a site effect study on Iranian strong motion data and proposed a four-class categorization based on the H/V spectral ratio of strong ground motions, which demonstrate a satisfactory correlation with the S-wave velocity profile.

TL;DR: In this article, a backpropagation neural network model is developed to predict the horizontal ground displacements generated by seismically induced liquefaction, which is known to produce significant damage to engineered structures.

TL;DR: In this paper, a seven-storey hotel building in Van Nuys, California has been measured by strong motion accelerographs and its aftershocks, including the 1971 San Fernando (ML=6.6, R=22), 1987 Whittier-Narrows (ML =5.9, R =41, km), 1992 Landers (ML 7.5, r=186, km) and 1994 Northridge (ML 6.4, r = 1.5 km) earthquakes.

TL;DR: In this paper, a study on the transient response of an elastic structure embedded in a homogeneous, isotropic and linearly elastic halfplane is presented, where the effects of non-zero initial conditions due to the pre-dynamic loads and/or self-weight of the structure are included in the transient boundary element formulation.

TL;DR: In this article, the authors conducted shaking table tests in which an embedded pipe was pulled laterally and the required drag force was monitored, showing that the amplitude of shaking acceleration affected the behavior of sand in both dry and water-saturated conditions.

TL;DR: In this paper, the indirect boundary element method (IBEM) is used to simulate wave propagation in two-dimensional irregularly layered elastic media for internal line sources, based on the integral representation for scattered elastic waves using single layer boundary sources.

TL;DR: In this paper, the authors considered the vertical dynamic response of a disk on a saturated poroelastic half-space, and developed the governing dual integral equations by using the Hankel transform techniques.

TL;DR: In this paper, a 2D finite element analytical model is developed to analyze the seismic response of rigid highway bridge abutments, founded on dry sand, which is used to study the dynamic response of an 8.0m high gravity retaining wall together with those from the analysis of the tilting wall centrifuge tests.

TL;DR: In this article, the Fourier amplitude spectra of free-field strong ground motion recorded at five stations in the San Fernando Valley of metropolitan Los Angeles, California, are described, searching for peaks that reoccur during different earthquakes.

TL;DR: In this paper, a team of surveyors were trained to collect field information such as geologic and geomorphologic features and, where possible, pre-existing geotechnic or geophysic information.

TL;DR: In this article, the authors discuss common problems encountered in automatic digitization of strong motion accelerograms, recorded on film, and suggest procedures for correcting or eliminating these problems, which may result from lack of training of the operators and lack of quality control in the process, which still seems to be esoteric and highly specialized.

TL;DR: In this paper, the process of dynamically induced liquefaction in two centrifuge soil models is analyzed and recorded lateral accelerations are employed to evaluate shear stress and strain histories at different elevations within the tested soil systems.

TL;DR: In this paper, a fully coupled two-dimensional infinite element for frequency domain analysis of wave propagation problems in unbounded saturated porous media is presented and the decay function of the element is derived based on the analytical solution of Biot (Theory of propagation of elastic waves in fluid-saturated porous solid).

TL;DR: In this paper, the authors used deformed bars as model reinforcement and used stone-aggregate microconcrete for constructing the models, and a parallel column test programme was conducted in which duplicates of typical columns in the test model frames were prepared, along with those of large sizes following similitude laws.

TL;DR: In this paper, the authors discuss the unit dissipated energy and the unit activation energy as possible energy criteria for evaluation of dynamic instability in soils, based on the influence of confining stress, coefficient of earth pressure at rest, dynamic stress amplitude and frequency of loading in the development of instability in the clays.

TL;DR: In this paper, the authors compared the behavior of stratified and homogeneous sand-silt-gravel composites during seismic liquefaction conditions for various silt and gravel contents.

TL;DR: In this article, a simple closed form solution of seismic stability analysis by extending Francais-Culmann's analysis is presented for a slope with the most critical planar mechanism and under the influence of horizontal and vertical earthquake accelerations.

TL;DR: In this article, a systematic method for optimal added damper placement in building structures, taking into account the response amplification due to the surface ground, is developed, and an original steepest direction search algorithm is applied to the interaction model.

TL;DR: In this article, a series of cyclic triaxial tests on clayey sands was carried out and attempts were made to evaluate the strain dependency of shear modulus and damping.

TL;DR: In this article, the authors numerically predict the magnitude of flow failure that could occur when soil liquefaction continues for a sufficiently long period, considering that liquefied soil behaves like a viscous liquid that deforms in undrained conditions with its volume remaining constant.

TL;DR: In this article, the issue of whether the horizontal-to-vertical spectral ratio (HVSR) method is sensitive to the amplitude of ground motion from near-field earthquakes is addressed.

TL;DR: In this paper, state of the art in modeling, synthetics, statistical estimation, and engineering applications of strong ground motion is reported, in particular models for earthquake wave motion are presented, in which uncertainties both in the earth medium and the seismic source are taken into consideration.

TL;DR: In this paper, a Monte-Carlo based stochastic finite element method is used to study the variability of seismic response of soil sites, where the uncertainties associated with the input motion and site characteristics may lead to a wide range of variability of the site response.

TL;DR: In this paper, an extensive investigation into the influence of key mechanical and geometrical parameters on horizontal impedance of square foundations resting on or embedded in a two-layer soil deposit is presented.

TL;DR: In this paper, the authors demonstrate how system identification techniques can be successfully applied to a soil-structure interaction system in conjunction with the results of the forced vibration tests on the Hualien large-scale seismic test structure which was recently built in Taiwan for an international joint research.

TL;DR: In this paper, the authors used the two-dimensional dynamic stiffness matrix to calculate the scattered motion of an out-of-plane motion for a dam-foundation analysis and showed the influence of the scattering of the seismic ground motion.