Influence of shallow footings on the dynamic response of saturated sand with low confining pressure

Barrios, Gonzalo; Larkin, Tam; Chouw, Nawawi

doi:10.1016/j.soildyn.2019.105872

Cited by 10 publications

(7 citation statements)

References 22 publications

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“…Despite the distance between the adjacent structures up to 15% of the induced energy can still be detected at the neighbouring structure. A recent study by Barrios et al 27 showed the importance of adjacent footings in the case of shallow footings on saturated sand.…”

Section: Highlightsmentioning

confidence: 98%

“…The incompatibility of employing model structures and unscaled sand leads to contact stress bellow the footings lower than that of a typical structure, yet the near-surface response of the soil-foundation system can be interpreted clearly. The same approach was used by Barrios et al 27 to study footings on saturated sand. The limitations of 1-g experiments depend on the dimensions of the laminar box, particularly the depth.…”

Section: Experimental Structuresmentioning

confidence: 99%

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Experimental study of the seismic response of a structure set amongst closely adjacent structures

Barrios

Larkin

Chouw

2021

Earthq Engng Struct Dyn

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The influence of soil on the dynamic response of soil-structure systems is usually studied on a stand-alone (SA) structure, even though closely adjacent structures form the vast majority of the population, especially in large cities. When structures are closely adjacent to each other, the wavefield in the soil, generated by the vibration of the footings, produces a complex interaction between them. Scant attention, especially by physical experiments, has been paid to this interaction. This work addresses the seismic response of a single degree-of-freedom structure (structure of focus) considering the influence of one and two closely adjacent neighbours. Experiments were performed using a large laminar box filled with sand sitting on a shake table. Results from utilising four recorded ground motions from the 2010-2011 Canterbury earthquake sequence are analysed. The effect of adjacent structures on the acceleration and displacement of the top mass of each structure, as well as the uplift of the footings, are discussed. Changes in the fundamental frequency due to the presence of neighbouring structures are identified. The use of the SA system, without consideration of closely adjacent structures, may result in a significant error in the estimation of the response of the structure of focus. In general, acceleration, lateral displacement and uplift reduced in comparison with that of the corresponding SA case. A footing settlement mechanism, resulting from uplift of the system that reflects the influence of adjacent structures, is also revealed.

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Section: Highlightsmentioning

confidence: 98%

Section: Experimental Structuresmentioning

confidence: 99%

Experimental study of the seismic response of a structure set amongst closely adjacent structures

Barrios

Larkin

Chouw

2021

Earthq Engng Struct Dyn

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“…Figure 2 shows the laminar box and the tall bridge model on soil support. The laminar box was placed on the shake table, and the Waikato River sand was filled with an average density of 1580 kg/m 3 (Barrios et al, 2020 and 2022). The sand was compacted using white noise until no surface settlement was measured.…”

Section: Shake Table Experiments With a Large Laminar Boxmentioning

confidence: 99%

Effect of pier height and support flexibility on seismic response of bridges including poundings

Yang

Meng

Chouw

2022

Advances in Structural Engineering

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In conventional seismic design, bridges usually are assumed to be fixed to a rigid support. This assumption, however, does not correspond to the reality of bridges with shallow footings since they can rock in strong earthquakes. It has been recognised that several factors significantly affect the response of bridges with rocking footings, including support flexibility, pier height and pounding. Most studies so far have mainly focused on a single factor. This research aims to narrow the knowledge gap by investigating the combined effect of pier height, support condition and earthquake characteristics on bridges with rocking ability. A series of shake table experiments on a single-frame bridge with different pier heights and support conditions under hard, medium and soft soil excitations were carried out. The influence of support flexibility was examined by comparing the response of rocking bridges on rigid support with that on soil support. The result shows that regardless of the flexibility of the support, in the case of no pounding, it is beneficial to take rocking footing into account because the maximum bending moment at the pier support can be reduced. However, when pounding was considered, the combined effect can generate an even larger maximum bending moment than that of the fixed-base bridge.

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“…Other studies estimate the dynamic bearing capacity for different local failure mechanisms: rocking, suppression, or sliding wedge of a foundation [3,21,23]. Barrios et al [5] analyzed the dynamic response of footings using an experimental approach from results on a vibrating table. A complete seismic analysis involves making a dynamic and time-history analysis that is complex to apply in practice.…”

Section: Bearing Capacitymentioning

confidence: 99%

“…These pseudo-static solutions have grown in recent years and have made it possible to generate design criteria and reduction factors to solve the problem of dynamic bearing capacity (Ph d ). Others have suggested studying the (Ph d ) through sophisticated dynamic constitutive models or researchers that require a greater effort to identify parameters and numerical management [5,24,41]. However, many investigations do not consider the generation of pore-water pressure, although this is one of the most important factors.…”

Section: Introductionmentioning

confidence: 99%

Long-term dynamic bearing capacity of shallow foundations on a contractive cohesive soil

Lazcano

Galindo

Patiño³

2021

Acta Geotech.

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The calculation of the long-term dynamic bearing capacity arises from the need to consider the generation of maximum pore-water pressure developed from a cyclic load. Under suitable conditions, a long-term equilibrium situation would be reached, when pore-water pressures stabilized. However, excess pore-water pressure generation can lead to cyclic softening. Consequently, it is necessary to define both the cohesion and the internal friction angle to calculate the dynamic bearing capacity of a foundation in the long term, being necessary to incorporate the influence of the self-weight of soil and therefore the width of the foundation. The present work is based on an analysis of the results of cyclic simple shear tests on soil samples from the port of El Prat in Barcelona. From these experimental data, a pore-water pressure generation formulation was obtained that was implemented in FLAC2D finite difference software. A methodology was developed for the calculation of the maximum cyclic load that a footing can resist before the occurrence of the cyclic softening. The type of soil studied is a contractive cohesive soil, which generates positive pore-water pressures. As a numerical result, design charts have been developed for long-term dynamic bearing capacity calculation and the charts were validated with the application of a real case study.

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Influence of shallow footings on the dynamic response of saturated sand with low confining pressure

Cited by 10 publications

References 22 publications

Experimental study of the seismic response of a structure set amongst closely adjacent structures

Experimental study of the seismic response of a structure set amongst closely adjacent structures

Effect of pier height and support flexibility on seismic response of bridges including poundings

Long-term dynamic bearing capacity of shallow foundations on a contractive cohesive soil

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