Seismic soil-structure interaction in multi-span bridges: Application to a railway bridge

Carbonari, Sandro; Dezi, Francesca; Leoni, Graziano

doi:10.1002/eqe.1085

Cited by 42 publications

(26 citation statements)

References 26 publications

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“…For the presence of the isolation system, the structure is not expected to undergo damage and the SSI problem may be conveniently studied with the substructure method under the assumption of linear behaviour for both soil and structure [15] (Figure 6). In a first step, the analysis of the soil-foundation system (kinematic interaction analysis) is carried out in the frequency domain by means of the numerical procedure proposed by Dezi et al [16] in which the transient motion, obtained from the site analysis, is used as seismic input.…”

Section: Ssi Analysis Of the Isolated Bridgesmentioning

confidence: 99%

Soil-structure interaction in the seismic response of an isolated three span motorway overcrossing founded on piles

Dezi

Carbonari

Tombari

et al. 2012

Soil Dynamics and Earthquake Engineering

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ABSTRACT:The effects of soil-structure interaction on the seismic response of an isolated three span motorway overcrossings founded on piles are investigated by considering a real bridge located along the A14 Motorway in central Italy. The dynamic and mechanical properties of the soils are obtained from a comprehensive geotechnical characterization of the sites. Ten triplets of real accelerograms, defined at the outcropping bedrock, are adopted and processed by local response analyses to capture the site amplification effects and the free-field motions within the deposits. The soil-structure interaction effects are evaluated by means of the substructure method by comparing the seismic response of the structures with those obtained from conventional fixed base models. Analyses demonstrate that the soil-foundation dynamic compliance as well as the energy loss due to radiation damping dot not modify significantly the overall behaviour of the isolated bridges, while soil-structure interaction may increase deformations and forces on the isolation devices with respect to those obtained with fixed base models.

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Section: Ssi Analysis Of the Isolated Bridgesmentioning

confidence: 99%

Soil-structure interaction in the seismic response of an isolated three span motorway overcrossing founded on piles

Dezi

Carbonari

Tombari

et al. 2012

Soil Dynamics and Earthquake Engineering

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“…However, if non‐linear phenomena need to be considered in the bridge superstructure, the analyses should be carried out in the time domain. In this case, if the response of the soil‐foundation system is assumed to remain in linear elastic range, stiffness and damping functions obtained in the frequency domain to characterize the response of the foundations can still be incorporated into the analysis, for instance, by approximating them by pertinent lumped parameter models (LPMs) that can subsequently be used to represent the response of the soil‐foundation system in a substructuring scheme …”

Section: Introductionmentioning

confidence: 99%

Seismic response of bridge piers on pile groups for different soil damping models and lumped parameter representations of the foundation

González

Padrón

Carbonari³

et al. 2018

Earthq Engng Struct Dyn

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Summary This paper presents a wide parametric study aimed at elucidating the influence, on the computed seismic response of bridge piers, of two related aspects of the model: (1) the adoption of the classical hysteretic or the causal Biot's damping models for the soil and (2) the use of two different lumped parameter models of different complexity and accuracy to approximate the impedances of the pile foundation. A total of 2072 cases, including different superstructures, pile foundations, soil deposits, and seismic input signals, are studied. The results are presented so that the influence of the different parameters involved in the analysis can be assessed. From an engineering point of view, both lumped parameter models provide, in general, sufficiently low errors. The choice of the most adequate model for each case will depend not only on the configuration of the structure and the soil‐foundation system but also on the assumed soil damping model, whose influence on the computed seismic responses is relevant in many cases. The nonphysical behaviour provided by the classical hysteretic damping model for the soil at zero frequency generates issues in the process of fitting the impedance functions. It is also found that larger deck displacements are predicted by Biot's model due to the higher damping at low frequencies provided by the classical hysteretic damping model.

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“… have proposed a numerical model by adopting a BEM‐FEM coupled formulation for the evaluation of the dynamic stiffness and kinematic response of pile groups with floating or end‐bearing inclined piles. These models also allow adopting the substructure approach to perform complete soil–structure interaction analysis evaluating effects of the soil–foundation compliance and dissipation properties on the seismic response of the superstructure, as widely investigated for vertical piles .…”

Section: Introductionmentioning

confidence: 99%

A numerical model for the dynamic analysis of inclined pile groups

Dezi

Carbonari

Morici

2015

Earthq Engng Struct Dyn

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Summary The paper presents a numerical model for the dynamic analysis of pile groups with inclined piles in horizontally layered soil deposits. Piles are modelled with Euler–Bernoulli beams, while the soil is supposed to be constituted by independent infinite viscoelastic horizontal layers. The pile–soil–pile interaction as well as the hysteretic and geometric damping is taken into account by means of two‐dimensional elastodynamic Green's functions. Piles cap is considered by introducing a rigid constraint; the condensation of the problem permits a consistent derivation of both the dynamic impedance matrix of the soil–foundation system and the foundation input motion. These quantities are those used to perform inertial soil–structure interaction analyses in the framework of the substructure approach. Furthermore, the model allows evaluating the kinematic stress resultants in piles resulting from waves propagating in the soil deposit, taking into account the pile–soil–pile interactions. The model validation is carried out by performing accuracy analyses and comparing results in terms of dynamic impedance functions, kinematic response parameters and pile stress resultants, with those furnished by 3D refined finite element models. To this purpose, classical elastodynamic solutions are adopted to define the soil–pile interaction problem. The model results in low computational demands without significant loss of precision, compared with more rigorous approaches or refined finite element models. Copyright © 2015 John Wiley & Sons, Ltd.

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Seismic soil-structure interaction in multi-span bridges: Application to a railway bridge

Cited by 42 publications

References 26 publications

Soil-structure interaction in the seismic response of an isolated three span motorway overcrossing founded on piles

Soil-structure interaction in the seismic response of an isolated three span motorway overcrossing founded on piles

Seismic response of bridge piers on pile groups for different soil damping models and lumped parameter representations of the foundation

A numerical model for the dynamic analysis of inclined pile groups

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