Numerical evaluation of seismic response of shallow foundation on loose silt and silty sand

Asgari, A.; Golshani, Aliakbar; Bagheri, Mohsen

doi:10.1007/s12040-013-0393-9

Cited by 18 publications

(3 citation statements)

References 41 publications

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“…Most of the engineering architectures areductile and often display foundation upliftment. Apart from very rigid bodies,the uplift is reduced by the structural deformities and forces as observed by Chopra and Yim [9].The reverberation of shallow foundations under sidewise periodic loading iscommonly nonlinear and consists ofsettlement ,sliding , rocking, and also includessoil yielding and foundation exhilaration. The dispersion of seismicenergy using the procedure of soil yielding underneath the foundation is mainly because of the nonlinear behaviour of shallow foundations during highamplitude earthquake-induced loading.…”

Section: Shallow Foundation-matmentioning

confidence: 97%

Effects of Earthquake on Foundations

Singh¹

2015

IJRET

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As we know,shaking due to seismic waves causes damage to buildings. The damage maybe influenced by the characteristics of soil in the affected area.The objective of the paper is to show the effect of the earthquake on different types of foundations such as shallow, mat/raft, pile and structures like gravity dam, arch dam etc. The reaction of soil to the loading of the building when a building undergoes an earthquake disturbance as a behaviour of deflection is known as the soil structure interaction. The movement of ground during theearthquake induces kinematic and inertial loading which decreases the bearing capacity and increments the settlement of shallow foundations. In seismic regions, where kinematic interactions have been observed, the mat foundations experiences overturning moments. Pile foundations are influenced by both kinematic and inertial interactions which causes many failures. The convoluted oscillating arrangement of acceleration and ground motion in a gravity dam,developing ephemeral dynamic loads because of inertia of dam and confined water is the seismic activity generated in these dams. The arch dam foundations undergoes effects of inertia and flexibility due to the propagation of seismicwaves.

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Section: Shallow Foundation-matmentioning

confidence: 97%

Effects of Earthquake on Foundations

Singh¹

2015

IJRET

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“…However, there are concerns about the scaling effect. Complementing the assessment of the physical model, numerical simulation can simulate complex soil-foundation interactions under dynamic loads at the prototype field scale (Asgari et al, 2014). However, a proper model of land constitution is needed.…”

Section: Csr Crr Fs =mentioning

confidence: 99%

Modelling of Cyclic Shear Modulus and Factor of Safety in Clay Soil

Ganiyu Oluwaseun,

Kennedy

2024

International Journal of Mechanical and Civil Engineering

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The liquefaction potential of Niger Delta soil was studied through formulated models based on cyclic shear modulus and factor of safety (FS). Data from the experiment were fitted into models to predict the cyclic shear modulus and Factor of Safety. The test analysis shows effective prediction of cyclic shear modulus for a given number of cycles (1–40) and cyclic shear strain (0.01–5 %). Comparison of results shows no significant differences between the measured and predicted cyclic shear modulus, especially from 0.1% shear strain and above. Similarly, the values of factor of safety predicted by the model were very close to those obtained from the experiment; the predicted FS obtained at depths close to 30 m across the sites were slightly greater than 1.0, as against the observed results. Despite this slight variation, the FS model still shows a high degree of prediction. Therefore, the formulated models can be utilised in the study of liquefaction potential, especially in the Niger Delta region.

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“…On the other hand, we should regard a balance between employing remediation methods and the corresponding enhancement in the demand for structure demand and intensify in the higher frequency when assessing structures located on non-liquefiable soil. Previous studies through in-situ tests (Ashford et al, 2006;Chang et al, 2010;Liu et al, 2023;Rollins et al, 2023;Rollins et al, 2005;Tokimatsu & Asaka, 1998), laboratory centrifuge and shake-table tests (Abdoun et al, 2003;Bhattacharya et al, 2003;Dashti et al, 2010a;Haeri et al, 2012;Jia et al, 2023;Liu et al, 2018;Tasiopoulou et al, 2013;Wang et al, 2019;Wilson et al, 2000), and numerical models (Asgari et al, 2014;Bagheri et al, 2018;Bazaios et al, 2023;Boushehri et al, 2023;Dou et al, 2022;Ling et al, 2023;Shahir & Pak, 2010;Yarmohammadi, 2023) mainly concentrated on the seismic performance of depth and shallow foundation-supported buildings in dry or saturated sand soils, with/without SFSI effects. To date, studies on the seismic failure structure mechanism in dry and saturated sand soils are still warranted due to the intrinsic complexities of SFSI.…”

Section: Introductionmentioning

confidence: 99%

Comparative assessment of seismic soil- shallow/pile foundation-structure responses in the saturated and dry soil deposits using 3D parallel finite element analysis

Asgari,

Bagheri,

Hadizadeh

2024

Preprint

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The research aims to investigate and compare the seismic responses of various models, including free field, pile group, fixed base, and shallow/deep foundation-structure with different structure’s height/width (h/b) ratios in saturated and dry sands during realistic earthquakes with varying intensities to realize the detrimental or beneficial effects of soil-foundation-structure-interaction (SFSI). None of the comparative research has simultaneously considered the shallow/deep foundations response in saturated and dry soil. This paper fills this gap using 3D non-linear parallel finite element models validated with two sets of centrifuge tests, and the extended analysis of nonlinearity effects of seismic SFSI considering large deformation performed. Focusing on the time-frequency content distribution result, the input acceleration amplitudes at different times are intensified by passing through the stiffer system (e.g., dry site, remediated soil, and shorter structure) at high frequencies. However, they decrease in the softer system, especially in liquefiable soil, due to the excess pore pressure build-up. The time of PGA alters at the foundation level, and correspondingly, the commencement time of significant settlement occurs quicker or later. A structure with a higher flexibility base increases rocking and, as a result, reduces flexural drifts, internal forces, and base shear force to seismic weight ratio in the structure, and subsequently decreases the structure's local damage. In contrast to lower h/b, the structure’s base shear force in the saturated soil site is more than in the dry one due to the higher peak structural acceleration. The results need attention in seismic design to help engineers in practical applications.

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Numerical evaluation of seismic response of shallow foundation on loose silt and silty sand

Cited by 18 publications

References 41 publications

Effects of Earthquake on Foundations

Effects of Earthquake on Foundations

Modelling of Cyclic Shear Modulus and Factor of Safety in Clay Soil

Comparative assessment of seismic soil- shallow/pile foundation-structure responses in the saturated and dry soil deposits using 3D parallel finite element analysis

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