Seismic performance of strip foundations on liquefiable soils with a permeable crust

Dimitriadi, Vasiliki; Bouckovalas, George D.; Papadimitriou, Achilleas G.

doi:10.1016/j.soildyn.2017.04.021

Cited by 27 publications

(7 citation statements)

References 18 publications

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“…Evidence from past earthquakes has demonstrated the devastating effect of soil liquefaction on the seismic response of buildings. Thus, the response of buildings resting on liquefiable ground and subjected to earthquake effects has received considerable attention in the literature in order to produce better insights into the potential seismic response of buildings and hence to enhance design procedures [1][2][3][4][5][6][7][8][9][10][11]. A summary of information from previous studies is listed in Table 1.…”

Section: Introductionmentioning

confidence: 99%

“…They noticed that increasing the building load up to 100 kPa increased the liquefaction-induced seismic settlement, while the settlement either stabilized or decreased beyond this load. Dimitriadi et al [6] applied 2D FDM to study the seismic performance of a foundation resting on a non-liquefiable permeable layer followed by a liquefiable layer. The study focused on the influence of the permeability of the non-liquefiable layer.…”

Section: Introductionmentioning

confidence: 99%

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Numerical Simulations of the Seismic Response of a RC Structure Resting on Liquefiable Soil

Alzabeebee

Forcellini

2021

Buildings

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The seismic response of buildings resting on liquefiable soil is a complex problem that is still poorly understood despite numerous studies on the topic. This paper attempts to enhance the understanding of this phenomenon by simulating an RC structure resting on liquefiable soil and subjected to seismic shakes. The solid-fluid fully coupled analysis was conducted with OpenSeesPL utilizing 58 earthquake records to simulate a wide range of shaking scenarios. In addition, the effect of the soil density and the thickness of the liquefiable layer were examined. It was noted that the liquefaction-induced settlement of the building increased as peak ground acceleration (PGA) increased, where the percentage increase ranged between 2.5% and 888.0% depending on the soil density, thickness of the liquefiable layer, PGA and the predominant frequency of the seismic shake. However, a scatter of the relationship between the PGA and the liquefaction-induced settlement was also noted due to the effect of the predominant frequency of the seismic shake. In addition, a reduced effect from soil density on the liquefaction-induced settlement was observed, where the settlement changed by up to 55% as the soil density changed from loose to medium, and by 68% as the density changed from loose to dense. Additionally, the results of the lateral displacement of the building did not show a definite trend with the increase in PGA, which could be attributed to the complex interaction between PGA amplification and the predominant frequency of the seismic shake as the liquefiable soil layer thickness changed.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Numerical Simulations of the Seismic Response of a RC Structure Resting on Liquefiable Soil

Alzabeebee

Forcellini

2021

Buildings

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“…The prediction of the response spectra of lique able soil deposits is not rigorously investigated in the literature (Gingery et al 2015) and not adequately covered by the national and global codes, since constructing in such conditions should be generally avoided according to the code guidelines, unless special measures are taken, such as soil reclamation, piles, etc. However, a number of studies evince that such precautions may not be in icted, on condition that a surface non lique able soil layer will be used to mitigate structure settlements (Ishihara et al 1993, Acacio et al 2001, Cascone and Bouckovalas 1998, Naesgaard et al 1998, Dashti et al 2010, Karamitros et al 2013, Dimitriadi et al 2017) Thus, estimating the seismic response in prone to liquefaction sites has recently arouse academic interest, since the evaluation of ground response is usually the rst step in the calculation of structural response in soil-structure interaction problems. To this direction, as a preliminary application, the proposed model is employed to investigate the calculation of the ground surface elastic response spectra for type S 2 soil pro les (with lique able layers), by analysing the seismic response of an ensemble of idealized, susceptible to liquefaction con gurations, submitted to a considerable number of actual seismic records with varying characteristics covering a variety of seismological conditions.…”

Section: Introductionmentioning

confidence: 99%

Site Response Analysis of S2 Soil Deposits Focusing on the Effects of Liquefaction and Pore-Pressure Dissipation on the Ground Surface Response Spectrum

Anthi

Gerolymos

2021

Preprint

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A numerical algorithm for executing non-linear ground response analysis of layered sites is developed, capable of reproducing liquefaction phenomena, considering the simultaneous dissipation of the excess pore water pressure through soil grains. Τhe wave propagation algorithm is based on the plasticity constitutive model for sand Ta-Ger expressed in a one dimensional p-q space form, which exhibits remarkable versatility in representing complex patterns of sand cyclic behavior, such as stiffness decay and decrease in strength due to build-up of pore-water pressure. Its calibration is based on shear modulus reduction and damping curves for drained loading conditions and liquefaction resistance curves for undrained conditions. A detailed presentation of the numerical model formulation is provided, indicating the numerical approach of the wave propagation and consolidation differential equations. The recorded seismic ground response of the Port Island array from Kobe 1995 earthquake is used as a benchmark for testing the validity of model predictions. The model is finally applied to estimate the elastic response spectra at the surface of soil profiles with liquefiable layers (ground type S2) as per EC8:2004. The investigation study involves the ground response analysis of diverse soil profiles, all including a liquefiable zone, excited with a suite of earthquake motions at their base. The acceleration time histories were extracted from the PEER Ground Motion Database having characteristics compatible with the NGA-estimated response spectrum at the bedrock and with key seismological parameters such as the earthquake magnitude Mw and horizontal distance from the fault RJB. Two different methods are applied regarding the selection of base excitations: Amplitude scaled records (to match a target response spectrum) and spectral matched records. From the results an idealized response spectrum is deduced in terms of the design spectrum parameters S, η, ΤΒ and TC. It is shown that the idealized ground surface response spectrum is marginally sensitive to method of base excitation selection.

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“…Both examined the case of a natural clay crust and used numerical analyses to correlate seismic settlements to the degraded factor of safety, at the end of seismic shaking while the subsoil is still liquefied, the first with the aid of design charts and the second by means of analytical relationships. Dimitriadi et al [15,16] extended the work of Karamitros et al [27] for the case of an artificial crust created by vibro-compaction of the native liquefiable soil, giving special emphasis on the required thickness and lateral extend of ground improvement.…”

Section: Introductionmentioning

confidence: 99%

Seismic isolation of surface foundations exploiting the properties of natural liquefiable soil

Karatzia

Mylonakis

Bouckovalas³

2019

Soil Dynamics and Earthquake Engineering

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Seismic performance of strip foundations on liquefiable soils with a permeable crust

Cited by 27 publications

References 18 publications

Numerical Simulations of the Seismic Response of a RC Structure Resting on Liquefiable Soil

Numerical Simulations of the Seismic Response of a RC Structure Resting on Liquefiable Soil

Site Response Analysis of S2 Soil Deposits Focusing on the Effects of Liquefaction and Pore-Pressure Dissipation on the Ground Surface Response Spectrum

Seismic isolation of surface foundations exploiting the properties of natural liquefiable soil

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