Seismic analysis of coupled soil-pile-structure systems leading to the definition of a pseudo-natural SSI frequency

Rovithis, Emmanouil; Pitilakis, Kyriazis; Mylonakis, George

doi:10.1016/j.soildyn.2008.11.005

Cited by 52 publications

(29 citation statements)

References 19 publications

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“…The table also shows that stiff structures may have considerable lengthening of period due to SSI. Similar observations have also been made by Rovithis et al (2009). Based on the results, it is also observed that soil consistency may have significant effect on T ssi .…”

Section: Effects Of Ssi On Fundamental Period Of the System (T Ssi )supporting

confidence: 88%

“…Rovithis et al 2009). The classical analytical expressions for calculating natural time period of structure incorporating SSI are presented in Table 5.…”

Section: Validation Of Model Used In Numerical Studymentioning

confidence: 99%

“…However, it is observed from Table 6 that the effect of coupled stiffness for pile group seems to be marginal on natural period of vibration for the particular piled raft-superstructure systems under investigation. While, the effect of such stiffness is considered to be an important parameter in soilpile-structure system (Rovithis et al 2009). Among the abovementioned analytical expressions, Gazetas (1996) has proposed the contribution of coupled stiffness as indicated in Eqn (10).…”

Section: Validation Of Model Used In Numerical Studymentioning

confidence: 99%

“…Boulanger et al (1999) assessed validity of dynamic p-y analysis in seismic soil-pile-structure interaction using dynamic centrifuge model tests. Yingcai (2002), Rovithis et al (2009) analysed a coupled behaviour of soilpile-structure systems, which concludes that the fixed base assumption without SSI may lead to unrealistic response of the system.…”

Section: Introductionmentioning

confidence: 99%

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Seismic Response of Soil-Pile Raft-Structure System

Saha

Dutta

Haldar

2015

Journal of Civil Engineering and Management

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Abstract. This paper presents an initial effort to investigate seismic response of soil-pile raft-structure system considering soil-structure interaction effect. In general, structure and piled raft under seismic load are designed considering fixed base condition. However, soil flexibility may result significant changes in the response of soil-pile raft-structure system. The study considers one storey system consisting of a mass in the form of a rigid floor slab supported by four columns. The piles are modelled by beam-column element supported by laterally distributed springs and dampers. This simple model used in present study is adequately tuned to exhibit reasonably accurate dynamic characteristics while compared to the existing well accepted methodologies. The study shows that soil-structure interaction leads to considerable lengthening of period though the lateral shear in columns are not significantly changed. However, the shear in piles is significantly increased due to SSI effect as inertia of the considerable foundation mass contributes to this increase in shear of pile. Thus, neglecting SSI may lead to unsafe seismic design of piles. A parametric study encompassing feasible variations of parameters is made under spectrum consistent ground motion. Effect of uncertainty in the soil subgrade modulus on the pile and column response variability is also studied.

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Section: Effects Of Ssi On Fundamental Period Of the System (T Ssi )supporting

confidence: 88%

“…Rovithis et al 2009). The classical analytical expressions for calculating natural time period of structure incorporating SSI are presented in Table 5.…”

Section: Validation Of Model Used In Numerical Studymentioning

confidence: 99%

Section: Validation Of Model Used In Numerical Studymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Seismic Response of Soil-Pile Raft-Structure System

Saha

Dutta

Haldar

2015

Journal of Civil Engineering and Management

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“…[7,8]) or taking also into account the modified 5 foundation input motion defined by kinematic interaction [9][10][11][12][13]. A few studies [14][15][16][17][18][19][20][21][22][23] analysing the effects of SSI on the dynamic characteristics of pile-supported structures can also be found in the scientific literature . Furthermore, up to the author's knowledge, only Gerolymos et al [24] and Giannakou et al [25] have analysed the influence of using deep foundations with inclined piles on the dynamic response of the structure they support.…”

Section: Introductionmentioning

confidence: 99%

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

Medina

Padrón

Aznárez

et al. 2015

Soil Dynamics and Earthquake Engineering

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This paper aims to contribute to clarify whether the use of battered piles has a positive or negative influence on the dynamic response of deep foundations and superstructures. For this purpose, the dynamic response of slender and non-slender structures supported on several configurations of 2 × 2 and 3 × 3 pile groups including battered elements is obtained through a procedure based on a substructuring model which takes soil-structure interaction into account. Results are expressed in terms of flexible-base period and maximum shear force at the base of the structure. Moreover, modified response spectra considering soil-structure interaction effects are provided for different rake angles. It is shown that an increment of the rake angle can result in beneficial or detrimental effects depending on the structural slenderness ratio.

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Influence of frequency‐dependent soil–structure interaction on the fragility of R/C bridges

Lesgidis

Sextos

Kwon

2016

Earthq Engng Struct Dyn

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Summary Bridge performance under earthquake loading can be significantly influenced by the interaction between the structure and the supporting soil. Even though the frequency dependence of the interaction mentioned in this study has long been documented, the simplifying assumption that the dynamic stiffness is dominated by the mean or predominant excitation frequency is still commonly made, primarily as a result of the associated numerical difficulties when the analysis has to be performed in the time domain. This study makes use of the advanced lumped parameter models recently developed in order to quantify the impact of the assumption on the predicted fragility of bridges mentioned in this study. This is achieved by comparing the predicted vulnerability for the case of a reference, well studied, actual bridge using both conventional, frequency‐independent, Kelvin–Voigt models and the aforementioned lumped parameter formulation. Analysis results demonstrate that the more refined consideration of frequency dependence of soil–structure interaction at the piers and the abutments of a bridge not only leads to different probabilities of failure for given intensity measures but also leads to different hierarchy and distribution of damage within the structure for the same set of earthquake ground motions even if the overall probability of exceeding a given damage state is the same. The paper concludes with the comparative assessment of the effect for different soil conditions, foundation configurations, and ground motion characteristics mentioned in this study along with the relevant analysis and design recommendations. Copyright © 2016 John Wiley & Sons, Ltd.

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Seismic analysis of coupled soil-pile-structure systems leading to the definition of a pseudo-natural SSI frequency

Cited by 52 publications

References 19 publications

Seismic Response of Soil-Pile Raft-Structure System

Seismic Response of Soil-Pile Raft-Structure System

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

Influence of frequency‐dependent soil–structure interaction on the fragility of R/C bridges

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