A probabilistic investigation on the dynamic behaviour of pile foundations in homogeneous soils

Minnucci, Lucia; Morici, Michele; Carbonari, Sandro; Dezi, Francesca; Gara, Fabrizio; Leoni, Graziano

doi:10.1007/s10518-021-01272-0

Cited by 6 publications

(3 citation statements)

References 38 publications

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“…It is worth mentioning that, in this work, neither the influence of asynchronous seismic inputs nor soil-structure interaction effects under the piers are taken into account, but refinements would be possible (e.g., [55,56]) provided that a proper knowledge of the geotechnical conditions of the soil is reached.…”

Section: Opensees Numerical Modelmentioning

confidence: 99%

Seismic Risk Analysis of Existing Link Slab Bridges Using Novel Fragility Functions

Scozzese,

Minnucci

2023

Applied Sciences

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In this paper, a comprehensive probabilistic framework is proposed and adopted to perform seismic reliability and risk analysis of existing link slab (LS) bridges, representing a widely diffused structural typology within the infrastructural networks of many countries worldwide. Unlike classic risk analysis methods, innovative fragility functions are used in this work to retrieve more specific and detailed information on the possible failure modes, without limiting the analysis to the global failure conditions but also considering several intermediate damage scenarios (including one or more damage mechanisms), and providing insights on the numerosity of elements involved within a given damage scenario. Reliability analyses are performed on a set of LS bridges with different geometries (total lengths and pier heights) designed according to the Italian codes enforced in the 1970s. Accurate numerical models are developed in OpenSees and Multiple-Stripe nonlinear time–history analyses are carried out to build proper demand models, from which fragility functions are determined according to two limit states: damage onset and near-collapse. Mean annual rates of exceeding are thus estimated through the convolution between the hazard and the fragility. The results shed light on the main failure mechanisms characterizing this bridge typology, highlighting how different levels of risk (hence safety margins) can be associated with failure scenarios that differ in terms of elements/mechanisms involved and damage extension. Such a higher level of detail in the risk analysis may be useful to better quantify post-earthquake consequences (e.g., costs and losses) and define more tailored retrofit interventions. A comparison of the reliability levels associated with bridges of the same class with different geometries is finally presented.

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Section: Opensees Numerical Modelmentioning

confidence: 99%

Seismic Risk Analysis of Existing Link Slab Bridges Using Novel Fragility Functions

Scozzese,

Minnucci

2023

Applied Sciences

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“…In the sequel, each case study is labelled according to the following rule: Material_ L/D &soil profile_ V s so that, for example, the case S_2H_100 identifies a steel caisson of length equal to 2 diameters embedded in a homogeneous soil characterised by a shear wave velocity of 100 m/s, while the case C_4E_250 indicates a reinforced concrete caisson of length equal to 4 diameters embedded in a non‐homogeneous soil deposit characterised by a shear wave velocity of 250 m/s at depth of one pile diameter. Some parameters, deemed to have a minor effect on the variability of impedances and on the kinematic response, 32 are assumed to be constant; in detail, a density

{{{\rho}}_s} = \;2.0

t/m 3 and a Poisson's ratio

{{{\nu}}_s} = \;0.4

are considered for the soil. As for caissons, densities

{{{\rho}}_c}

equal to 2.5 and 7.85 t/m 3 , and Poisson's ratios

{{{\nu}}_c}

equal to 0.2 and 0.3 are considered for reinforced concrete and the steel skirts, respectively.…”

Section: Model Validationmentioning

confidence: 99%

Winkler model for predicting the dynamic response of caisson foundations

Carbonari

Bordón

Padrón

et al. 2022

Earthq Engng Struct Dyn

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The paper presents a Winkler‐based numerical model for the analysis of the dynamic response of caisson foundations. The model allows the evaluation of the impedance functions and of the foundation input motion (FIM), which can be used in the framework of the substructure approach to compute inertial soil‐foundation superstructure interaction analyses. In addition, kinematic stress resultants due to seismic shear waves propagating into the soil can be estimated. The caisson is modelled as a Timoshenko beam and the soil‐caisson interaction forces are derived from the analyses of the plane‐strain vibration problem of an annular rigid ring embedded into the soil. The problem solution is obtained in the frequency domain exploiting the finite element approach and generic soil stratigraphies can be considered in the applications. The model, which is characterised by a very low computational effort, is validated by performing a parametric investigation, comparing results with those obtained from more rigorous BEM‐FEM models of the soil‐caissons systems. Finally, some applications to real caisson foundations of offshore wind turbines (OWTs) are shown to demonstrate the model accuracy in capturing the seismic response of the foundations obtained from more rigorous models.

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“…The macro-element accounts for the soil nonlinear behaviour in the near-field, as well as in the far-field, dynamic impedance, and energy dissipation through radiation damping. Minnucci et al (2022) investigate the dynamic behaviour of pile foundations in a probabilistic framework, assuming uncertainties as uncorrelated probabilistic distributions of the main parameters governing the soil-foundation dynamic response, and adopting a numerical model developed by the Authors. The approach uses a quasirandom sampling technique to limit the computational effort.…”

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confidence: 99%

Preface to special issue on modelling and assessment of soil-structure interaction effects on the dynamics of structures

Carbonari

Dezi

Padrón

et al. 2022

Bull Earthquake Eng

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A probabilistic investigation on the dynamic behaviour of pile foundations in homogeneous soils

Cited by 6 publications

References 38 publications

Seismic Risk Analysis of Existing Link Slab Bridges Using Novel Fragility Functions

Seismic Risk Analysis of Existing Link Slab Bridges Using Novel Fragility Functions

Winkler model for predicting the dynamic response of caisson foundations

Preface to special issue on modelling and assessment of soil-structure interaction effects on the dynamics of structures

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