Shallow strip foundations subjected to earthquake-induced soil liquefaction: Validation, modelling uncertainties, and boundary effects

Kassas, Konstantinos; Adamidis, Orestis; Anastasopoulos, Ioannis

doi:10.1016/j.soildyn.2021.106719

Cited by 15 publications

(12 citation statements)

References 19 publications

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“…The numerical methodology has been compared against 6 centrifuge model tests of different liquefiable layer depths and foundation bearing pressures, where the ability to predict settlements was showcased. For a detailed outline of the strengths and the limitations of the numerical methodology the reader is referred to in Kassas et al 19 Three idealized building structures were analyzed, varying the height (and therefore the aspect ratio), the foundation bearing pressure (𝑞), and the depth of the liquefiable layer (𝐷 𝐿 ∕𝐵). Before studying the effect of SSSI on the response of neighboring structures, the corresponding reference cases of single building configurations were analyzed.…”

Section: Discussionmentioning

confidence: 99%

“…The lateral model boundaries are positioned at a sufficient distance of four liquefiable layer depths (4.0𝐷 𝐿 ) from the foundation edges to limit boundary effects. 19 A laminar box condition is adopted for the lateral boundaries, where opposite lateral boundary nodes of the same depth are connected. The seismic excitation is the one recorded in one of the centrifuge model tests of Adamidis and Madabhushi, 8 which was used for the assessment of the numerical analysis methodology.…”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…Before extracting reliable results, validation against centrifuge model tests (or real scale shake table tests) is necessary (e.g., Ref. [19,20]). Based on such numerical analyses, Karamitros et al 21 observed that the presence of initial deviatoric static stress induced by the foundation is beneficial, as it prevents the excess pore water pressure ratio (𝑟 𝑢 ) under the foundation from reaching 𝑟 𝑢 ≈ 1, as in the field.…”

mentioning

confidence: 99%

“…18 The numerical methodology employed herein has been compared against six centrifuge model tests of single structures on surface foundations with variable bearing pressures, resting on liquefiable layers of different depths. 19 The first key contribution of the present paper is the in-depth assessment of the effects of SSSI by direct comparison to isolated structures. The second key contribution is the use of the numerical model to investigate the effects of foundation bearing pressure, depth of the liquefiable layer and gap between the structures on the overall mechanisms, the settlement and the rotation of two adjacent buildings.…”

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confidence: 99%

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Structure–soil–structure interaction (SSSI) of adjacent buildings with shallow foundations on liquefiable soil

Kassas

Adamidis

Anastasopoulos

2022

Earthq Engng Struct Dyn

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This paper studies the effect of structure-soil-structure interaction (SSSI) on the seismic response of neighboring structures with shallow foundations on liquefiable sand. The problem is studied through coupled hydromechanical analyses.Nonlinear soil response is modeled with PM4Sand, calibrated on the basis of soil element tests of Hostun sand. The numerical methodology has been compared against six centrifuge model tests, showcasing its ability to predict the settlements. Three idealized structures of width B are considered, of different aspect ratio and foundation bearing pressure q, founded on two liquefiable layer depths, D L /B = 1 and 2. Initially, the response of a single building is studied, offering insights on the developing failure mechanisms. While the settlement increases with q in the case of a deep (D L /B = 2) layer, this is not the case for the shallow (D L /B = 1) layer, where the increased soil confinement leads to the development of a stiffer soil column, which offers increased support to the structure. Pairs of identical structures are subsequently analysed, revealing the effect of SSSI on settlement (w) and rotation (ϑ). While its effect on w is beneficial, its effect on ϑ is detrimental, leading to a dramatic increase compared to the single structure. The detrimental effect of SSSI on θ is shown to be a function of the gap (s/B) between the buildings and the depth of the liquefiable layer (D L /B). In the case of the shallow layer, the two structures rotate away from each other. This is not the case of the deeper layer, where they may either rotate away or towards each other, depending on s/B.

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%