Foundation impedance functions from full-scale soil-structure interaction tests

Amendola, Chiara; Silva, Filomena de; Vratsikidis, Athanasios; Pitilakis, Dimitris; Anastasiadis, Anastasios; Silvestri, Francesco

doi:10.1016/j.soildyn.2020.106523

Cited by 22 publications

(18 citation statements)

References 36 publications

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“…Eqs. (1) can be solved in the frequency domain from the dynamic equilibrium of the structure-foundation system depicted in Figure 1b, as described by [19].…”

Section: Definitionmentioning

confidence: 99%

“…Table 1 lists the analytical solutions and the associated hypotheses on the subsoil model adopted in this study to characterize the analytical impedance functions used for comparison with the experimental impedances back-calculated by [19]. The classic solution by Pais and Kausel [9] for a homogenous elastic halfspace was firstly selected for comparison; these equations are very similar to the widespread expressions given by [8] which therefore were not considered.…”

Section: Analytical Impedancesmentioning

confidence: 99%

“…The raft can be considered as an ideal 'shallow foundation' since the surrounding soil was intentionally removed before the execution of the tests discussed in the following. More details on the structural features are discussed by [19] and [24]. The foundation subsoil was investigated and its dynamic properties were defined on the basis of extended geophysical and geotechnical in-situ and laboratory surveys reported in earlier studies [24]- [27].…”

Section: Experimental Facility: Europroteas In the Euroseistestmentioning

confidence: 99%

“…The dynamic response of the instrumented facility was firstly identified under random ambient noise test, in which the structural response was recorded with no external excitation. Free-vibration tests were also carried out by a 'snap-back' procedure, in which the roof was initially slightly displaced and thereafter released to induce the free vibration of the prototype structure (see [19]). The structure was then subjected to sinusoidal forced vibration tests, by changing the frequency in a range of interest of earthquake engineering, i.e.…”

Section: Instrumentation Layout and Performed Testsmentioning

confidence: 99%

“…This paper discusses the comparison between theoretical functions accounting for different hypotheses on the soil profile and the frequency-dependent experimental swaying and rocking impedances calculated from full-scale field tests on the single degree of freedom prototype EuroProteas in the EuroSeistest in Greece [19]. The objective of the study is to provide an evaluation on the reliability of field measurements of the impedance functions, in order to overcome the usual simplified assumptions on soil and foundation adopted by the analytical formulations.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

On the Effectiveness of Experimentally-Derived Foundation Impedance Functions

Amendola¹,

Silva²,

Pitilakis³

et al. 2021

Proceedings of the 8th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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In the past decades, several experimental and analytical investigations showed that the dynamic behavior of buildings can be significantly affected by the interaction with a soft foundation soil. In such cases, the actual response of structures founded on shallow foundations can be successfully simulated if the structural model is equipped with springs and dashpots calibrated through frequency-dependent impedance functions. This paper discusses the results of a research project aimed at back-calculating the impedance functions of a shallow square foundation from records of the dynamic behavior of the EuroProteas soil-foundation-structure (SFS) facility, deployed at Euroseistest (Greece). To this aim, forced-vibration tests were executed under different frequencies and increasing loading amplitudes. The experimental impedances were compared with several analytical solutions available in the literature, accounting for different hypotheses on the subsoil model. This comparison improved when the shear wave velocity VS used to define the analytical functions was reduced accounting for the strain level mobilized by the increasing amplitude of the applied force. A numerical model was realized in the SAP2000 software. The compliance of foundation soil has been introduced using elastic springs, the stiffness of which was calibrated considering either the analytical or the experimental impedances. The fundamental frequency obtained from a modal analysis of the SAP2000 model equipped with the springs calibrated on the experimental impedances turned out to reproduce the fundamental frequency of EuroProteas effectively measured on-site. Such results showed the effectiveness of using experimental impedance functions in the numerical simulations, especially when equivalent soil parameters are hard to define.

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“…Eqs. (1) can be solved in the frequency domain from the dynamic equilibrium of the structure-foundation system depicted in Figure 1b, as described by [19].…”

Section: Definitionmentioning

confidence: 99%

Section: Analytical Impedancesmentioning

confidence: 99%

Section: Experimental Facility: Europroteas In the Euroseistestmentioning

confidence: 99%

Section: Instrumentation Layout and Performed Testsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

On the Effectiveness of Experimentally-Derived Foundation Impedance Functions

Amendola¹,

Silva²,

Pitilakis³

et al. 2021

Proceedings of the 8th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

View full text Add to dashboard Cite

show abstract

Effect of a symmetric V‐shaped canyon on the seismic response of an adjacent building under oblique incident SH waves

Zhang

Gao

et al. 2023

Earthq Engng Struct Dyn

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To elucidate whether an irregular topography affects the seismic response of nearby structures, an analytical solution to the dynamic interaction between a symmetric V-shaped canyon and an adjacent building under the incidence of SH waves is proposed by using the wave function expansion method. The dynamic canyon-soil-structure interaction is decomposed into two problems of scattering and radiation. The building is idealized as a shear wall supported by a semicircular rigid foundation. The analytical solution can be degenerated theoretically to the canonical model of a shear wall embedded in a half-space for either a zero depth-to-width ratio of the canyon or an infinite canyon-building distance. Through a numerical comparison with two past exact solutions to the sole shear wall model as well as the sole V-shaped canyon model, the correctness of the method in this paper is verified. A systematic parametrical analysis in both frequency and time domains is performed. It is found that the seismic response of the building may be amplified when it is on the wave-facing side of the canyon. The degree of amplification is closely related to the size and depth-to-width ratio of canyon, the wave velocity of half-space, and the incident angle and frequency content of seismic waves. The potential adverse effects of the V-shaped canyon on the ground motion input of adjacent buildings should be considered in the seismic design.

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Evaluation of Seismic Reliability for Isolated Multi-span Continuous Deck Bridges

Amendola

2022

Lecture Notes in Networks and Systems

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Foundation impedance functions from full-scale soil-structure interaction tests

Cited by 22 publications

References 36 publications

On the Effectiveness of Experimentally-Derived Foundation Impedance Functions

On the Effectiveness of Experimentally-Derived Foundation Impedance Functions

Effect of a symmetric V‐shaped canyon on the seismic response of an adjacent building under oblique incident SH waves

Evaluation of Seismic Reliability for Isolated Multi-span Continuous Deck Bridges

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