Influence of pile inclination angle on the dynamic properties and seismic response of piled structures

Medina, Cristina; Padrón, Luis A.; Aznárez, Juan J.; Maeso, Orlando

doi:10.1016/j.soildyn.2014.10.027

Cited by 30 publications

(12 citation statements)

References 33 publications

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“…Anastasopoulos et al [7], Gerolymos et al [8], and Gerolymos et al [9] studied the inclined straight alternating pile group foundation in a postearthquake area and observed that whether the effect of the inclined pile on the pile group foundation is beneficial or not depends on the slenderness ratio of the superstructure and the connecting pile form and pile cap. Medina et al [10] used 2 × 2 and 3 × 3 low-rise pile cap pile groups, including inclined piles for research, and determined whether the size of inclined piles is beneficial to the structure or not also depends on the slenderness ratio of the superstructure. Qizhe et al [11] used threedimensional elastoplastic dynamic finite element technology and three different seismic waves to explore the pile tilt angle influence law and free pile length on the seismic responses of an inclined pile foundation of a high-rise pile cap.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Seismic Soil-Pile Interaction in Liquefying Ground

Kong

Deng

2020

IEEE Access

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In this paper, the pile-soil interaction of the pile foundation of an inclined straight alternating group in a liquefiable site under a seismic load was studied through the form changes to the pile cap within the inclined straight alternating group. Based on an analysis of the soil acceleration, hole pressure ratio, horizontal displacement of the pile body, vertical displacement of the pile body, and bending moment of the pile body, the dynamic characteristics of the pile soil at the free site are studied with two layers of liquefiable soil. The results show that the sand layer can amplify seismic waves under a seismic load, and therefore, the soil acceleration under the pile foundation model of the high-rise pile cap group is slightly greater than that of the low-rise pile cap model; then, the pore pressure ratios at the monitoring point in the low-rise pile cap and high-rise pile cap pile foundation models present certain fluctuations. The analysis of the pile displacement and the bending moment shows that the pile foundation from the high-rise pile cap group can resist the seismic load better than that from the low-rise pile cap group. INDEX TERMS Concrete oblique-straight alternating pile group, numerical simulation, inclined straight alternate pile, seismic response, low-and high-rise pile cap, pile-soil interaction.

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Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Seismic Soil-Pile Interaction in Liquefying Ground

Kong

Deng

2020

IEEE Access

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“…(Kato, 2011;Chen, 2009) Therefore, the dynamic stability of these pile foundations needs to be solved when subjected to lateral loads such as seismic forces. In term of the dynamic analysis of pile group-soil-bridge structure system of high bearing platform under the state of seismic liquefaction, it is found that the bending moment of inclined pile is significantly smaller than that of straight pile and straight pile group, and the different angle of inclined pile also affects the dynamic effect of pile group (Medina, 2015).…”

Section: Introductionmentioning

confidence: 99%

Study on the bending moment diagram of straight and inclined pile groups in saturated sands with different thicknesses

Yang

Dongfeng

et al. 2020

JGS Special Publication

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The dynamic response law of a pile foundation in liquefied soil has always been a significant issue in the field of seismic engineering. This paper is based on a shaking table test of 2×2 straight pile groups and 2×2 inclined pile groups in nonliquefied sand and saturated sand with different thicknesses. The bending moment of pile in nonliquefied sand and saturated sand with different thicknesses was studied by applying the Qian'an wave with a certain frequency and acceleration. It shows that the liquefaction of sand will cause the bending moment of pile body to increase. Under the same working condition, the bending moment of inclined pile is smaller than that of straight pile. The difference of bending moment at the bottom of pile is larger, and the difference is more obvious with the increase of the thickness of liquefied sand. Therefore, the inclined pile is more resistant to external load than the straight pile.

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“…Regarding pile‐supported structures, Medina et al analyzed the dynamic response of pile‐supported buildings subjected to shear waves but only vertical incidence was considered in that work. Álamo et al employed a boundary element method‐finite element method (BEM‐FEM) model to obtain results for the dynamic response, in terms of maximum shear forces at the base of the structures, of a group of three structures supported on 3 × 3 pile groups and subjected to planar oblique shear waves.…”

Section: Introductionmentioning

confidence: 99%

“…Effective damping̃for different 3 × 3 pile groups. E p ∕E s = 10 3 , s = 0.05, and s = 0.4 ( cr = 65.9 o ).L∕d(s∕d) = 7.5 (2.5) 15 (5), 30(10). Grey line to be read on the right axis provide a zoomed out view…”

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confidence: 99%

Variations in the dynamic response of structures founded on piles induced by obliquely incident SV waves

Medina

Álamo

Aznárez

et al. 2019

Earthq Engng Struct Dyn

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Summary Although the seismic actions generally consist of a combination of waves, which propagates with an angle of incidence not necessarily vertical, the common practice when analyzing the dynamic behavior of pile groups is based on the assumption of vertically incident wave fields. The aim of this paper is to analyze how the angle of incidence of SV waves affects the dynamic response of pile foundations and piled structures. A three‐dimensional boundary element‐finite element coupling formulation is used to compute impedances and kinematic interaction factors corresponding to several configurations of vertical pile groups embedded in an isotropic homogeneous linear viscoelastic half‐space. These results, which are provided in ready‐to‐use dimensionless graphs, are used to determine the effective dynamic properties of an equivalent single‐degree‐of‐freedom oscillator that reproduces, within the range where the peak response occurs, the response of slender and nonslender superstructures through a procedure based on a substructuring model. Results are expressed in terms of effective flexible‐base period and damping as well as maximum shear force at the base of the structure. The relevance and main trends observed in the influence of the wavefront angle of incidence on the dynamic behavior of the superstructure are inferred from the presented results. It is found that effective damping is significantly affected by the variations of the wave angle of incidence. Furthermore, it comes out that the vertical incidence is not always the worst‐case scenario.

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Influence of pile inclination angle on the dynamic properties and seismic response of piled structures

Cited by 30 publications

References 33 publications

Numerical Simulation of Seismic Soil-Pile Interaction in Liquefying Ground

Numerical Simulation of Seismic Soil-Pile Interaction in Liquefying Ground

Study on the bending moment diagram of straight and inclined pile groups in saturated sands with different thicknesses

Variations in the dynamic response of structures founded on piles induced by obliquely incident SV waves

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