Showing papers in "Soil Dynamics and Earthquake Engineering in 2015"

TL;DR: Results from both synthetic and real data demonstrate that GWO applied to surface wave analysis can show a good balance between exploration and exploitation that results in high local optima avoidance and a very fast convergence simultaneously.

TL;DR: In this paper, the experimental results of vertical ground vibration accelerations induced by very high speed trains running over a non-ballasted track on embankment with speeds from 300 to 410 km/h are reported and analyzed in detail for the first time.

TL;DR: In this article, a comprehensive linear, equivalent-linear, and nonlinear site response analyses of 191 ground motions recorded at six validation sites in the Kiban-Kyoshin network (KiK-net) of vertical seismometer arrays in Japan were performed.

TL;DR: In this article, the performance of pipelines subjected to permanent strike-slip fault movement is investigated by combining detailed numerical simulations and closed-form solutions, and the results show that axial tensile tensile strains are in excellent agreement with results obtained from detailed finite element models that employ beam elements and distributed springs along the pipeline length.

TL;DR: In this article, a 2.5D finite element model combining with thin-layer elements was applied to establish a vehicle-track-foundation coupled dynamic analysis model, and a quarter-car model was used to derive the equation for wheel-rail interaction force considering track irregularity.

TL;DR: In this article, the authors investigated the damage mechanisms of a subway structure in soft soil while experiencing strong ground motions and found that the structure was most severely damaged at the top or the bottom of the interior columns.

TL;DR: In this paper, the authors analyzed over 1500 ground-borne vibration records, at 17 high speed rail sites, across 7 European countries and found that soil material properties are the most influential parameter that effect vibration levels while the effect of train speed is low.

TL;DR: In this paper, the influence of a non-cohesive fines content on small-strain shear modulus G max, smallstrain constrained elastic modulus M max, shear degradation G ( γ ) / G max, damping ratio D (γ ) and threshold shear strain amplitudes γtl and γtv has been studied in approx. 130 resonant column (RC) tests with additional P-wave measurements by means of piezoelectric elements.

TL;DR: In this article, the impact of soil-structure interaction (SSI) and site effects on the seismic performance and vulnerability of reinforced concrete moment resisting frame (MRF) buildings is investigated.

TL;DR: In this article, a modified Hardin hyperbolic model was suggested to describe the backbone curves of frozen compacted sand from Nehe, Heilongjiang Province in China which was subjected to the closed-system freeze-thaw cycles.

TL;DR: In this paper, the effects of vertical seismic force on initiation mechanism of near-fault large-scale landslides by using the Daguangbao landslide induced by the 2008 Wenchuan earthquake as an example were analyzed.

TL;DR: In this article, a stiff wave barrier consisting of overlapping jet grout columns has been installed along a railway track to mitigate railway induced vibrations, and extensive measurements have been carried out before and after installation of the barrier, including free field vibrations during train passages.

TL;DR: In this article, an analytical model of offshore wind turbines (OWTs) supported on flexible foundation is presented to provide a fast and reasonably accurate natural frequency estimation suitable for preliminary design or verification of Finite Element calculations.

TL;DR: In this paper, the seismic dynamics of a composite breakwater on liquefiable seabed foundation is investigated using a fully coupled numerical model FSSI-CAS 2D.

TL;DR: In this paper, the authors investigated the inelastic response of three-dimensional (3-D) structures subjected to repeated earthquakes and concluded that the multiplicity of earthquakes should be taken into account for the reliable seismic design of reinforced concrete structures.

TL;DR: In this paper, the seismic response of a linear elastic medium including a buried unlined tunnel subjected to vertically propagating incident SV and P waves is addressed by utilizing a robust numerical algorithm working based on the boundary element method.

TL;DR: In this paper, a procedure is described for quick seismic vulnerability assessment according to the EMS 98 classification, which aims to reduce the uncertainty in the class assessment using a set of parameters, related to typological features, that are identified as modifiers of the vulnerability level.

TL;DR: In this article, closed-form solutions for the response of damped single-degree-of-freedom (SDF) systems subjected to Mavroeidis Papageorgiou (MP) pulses are derived and employed to construct closed form solutions for response of the simplified continuous model.

TL;DR: The second strongest earthquake recorded in Chile's history, only exceeded by the 1960 Valdivia earthquake of Magnitude 95, occurred on February 27, 2010 as discussed by the authors, and the shaking duration of each acceleration record was computed, and the longest records were coincident with the area of maximum crustal co-seismic deformations.

TL;DR: In this article, the response of dry, medium-dense, Nevada Sand with a relative density of 60% is measured in the centrifuge under six 1-D, horizontal earthquake motions applied to the base of a centrifuge container.

TL;DR: In this article, a simplified numerical model for buried steel pipes crossing strike-slip faults and oriented perpendicular to the fault is presented, which permits plastic hinge formations in the pipe due to incrementally applied fault movements, allows determination of the critical length of the pipeline and measure strains developed on the tension and compression sides in pipe.

TL;DR: In this paper, the authors show that allowing the foundation to work at such extreme conditions may not only lead to system collapse, but it would help protect (save) the structure from seismic damage.

TL;DR: In this paper, the effects of absorbing material on the dynamic response of the soil and the amount of energy dissipated by the absorbing boundaries were investigated, and it was found that the absorbed energy ranged between a minimum of 41% to a maximum of 92% of the input levels, depending mainly on the foam used in the test.

TL;DR: In this article, the seismic response of soils consisting of uniform sandy soils with two different relative densities (50% and 90%) was investigated using the RPI geotechnical centrifuge facility, with a one-dimensional earthquake simulator at 60 grams.

TL;DR: In this article, a method for the determination of small strain shear modulus in BE test was proposed for both saturated clean sands and natural sands based on Biot's theory accounting for the dispersion of shear wave was employed to interpret the results of BE tests.

TL;DR: In this article, the authors investigated the effectiveness of heavy masses next to the track as a measure for the reduction of railway induced ground vibration by means of numerical simulations, where the heavy masses are placed in a continuous row along the track forming a wall.

TL;DR: In this article, the coupling effects of cyclic deviator stress and cyclic confining pressure on the deformation behavior of natural soft clay under partially-drained conditions, were investigated.

TL;DR: In this article, the authors proposed a modeling and simulation method of seafloor seismic motions on offshore sites, which are composed of the base rock, the porous soil layers and the seawater layer, based on the fundamental hydrodynamics equations and one-dimensional wave propagation theory.

TL;DR: In this paper, the feasibility of soft-soft and soft-stiff design approaches considering a 2MW and 5MW monopile supported three bladed offshore wind turbine (OWT) founded in clay is addressed.

TL;DR: In this article, a coupled model of springs and dashpots is utilized for through-the-soil interaction of the adjacent structures, for two types of soft soils. And the effects of both of the mentioned phenomena on the inelastic response of selected steel structures are studied.