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Comparison Between Two Approaches for Non-linear FEM Modelling of the Seismic Behaviour of a Coupled Soil–Structure System

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Abstract

One basic factor influencing the seismic design of new structures, as well as the retrofitting and/or improvement of existing ones, is the dynamic interaction between the foundation soil and the structure. An accurate investigation of the structure and surrounding soil is the first fundamental step in a realistic evaluation of the seismic performance of the coupled soil–structure system. The present paper deals with the dynamic behaviour of a coupled soil–structure system, i.e. a school building in Catania, characterized by a high seismic hazard. The soil properties were carefully defined by means of in situ and laboratory tests. Different 2D numerical analyses were performed, considering both free-field conditions and the soil–structure interaction (SSI), in order to evaluate quantitatively the known differences between the two types of condition. Seven accelerograms scaled at the same PHA, regarding the estimated seismicity of Catania, were adopted. Two different approaches were used to study soil-nonlinearity, which is extremely important in soil mechanics: firstly, adopting constant degraded shear modula G and increased soil damping ratios D, in line with EC8—Part 5 (2003); secondly, choosing G and D according to the effective strain levels obtained for each different input. The main goals of the paper are: (1) to highlight the importance of considering and not considering the dynamic SSI in terms of: acceleration profiles and soil filtering effect; (2) to evaluate the influence of different modelling of soil non-linearity on the dynamic response of the system; (3) to compare the response spectra obtained with that given by the Italian technical code (NTC in New technical standards for buildings, 2008).

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Abbreviations

A :

Amplification function in the frequency domain; i.e. the ratio between the Fourier spectrum at a fixed depth and the Fourier spectrum at the base of the soil deposit

a, a g :

Acceleration

B :

Width of the structure

b :

Coefficient of reduction of the maximum acceleration expected at the site

BC 1 :

Label for boundary condition 1, for all the nodes at the base of the mesh

BC 2 :

Label for boundary condition 2, for all the nodes of the soil vertical boundaries

c′:

Cohesion of the soil

C c :

Parameter depending on the soil type

C 1 :

Coefficient proposed by NTC (2008) for the evaluation of the period of the structure

D,D(γ):

Damping ratio at the current shear strain γ

DSSI :

Dynamic soil–structure interaction

e 0 :

Void ratio

E :

Young modulus

E* :

Degraded Young modulus

FEM :

Finite element method

FF :

Free field

f :

Frequency

f input :

Frequency of the input

f FF :

Soil frequency evaluated considering the FF alignment

f SSI :

Soil frequency evaluated considering the SSI

F 0 :

Seismic parameter: ratio of the spectral acceleration of the constant spectral acceleration branch to the peak ground acceleration

G, G(γ):

Shear modulus at the current shear strain γ

G 0 :

Shear modulus at small strains

G s :

Specific gravity

g :

Gravity acceleration

H :

Height of the soil deposit

h :

Height of the structure

I A :

Intensity of Arias

K h :

Horizontal seismic coefficient

K v :

Vertical seismic coefficient

n :

Porosity

PHA :

Input peak horizontal acceleration

R a :

Amplification ratio, i.e. the ratio between the maximum acceleration at a fixed depth and the maximum acceleration at the base of the soil deposit

RCT :

Resonant column test

S :

Soil factor by NTC (2008)

S a :

Spectral acceleration

SLO :

Limit state of operability

SLD :

Limit state of damage limitation

SLV :

Limit state for life safety

SLC :

Limit state for collapse prevention

SDMT :

Seismic dilatometer Marchetti test

S S :

Stratigraphic amplification coefficient

S T :

Topographical coefficient

SSI :

Soil–structure interaction

T :

Period

T c :

Seismic parameter: upper limit of the period of the constant spectral acceleration branch

T FB :

Natural period of the fixed-base structure

T SSI :

Natural period of the structure including the soil

T STRU :

Natural period of the structure

T INP :

Predominant period of the input motion

U 2 :

Displacement in y-direction

U 3 :

Displacement in z-direction

V s :

Shear waves velocity

V s * :

Degraded shear wave velocity

w :

Natural water content

z :

Vertical axis (depth)

α :

Rayleigh damping factor

β :

Rayleigh damping factor

φ′:

Angle of shear strength

γ :

Shear strain

γ dry :

Dry unit weight

ν :

Poisson ratio

ω :

Angular frequency

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Acknowledgements

Financial supports provided by the POR-FESR Research Project Sicilia 2007–2013 (Line 4.1.1.1), funded by the European Community, and provided by the DPC/ReLUIS 2017 Research Project, funded by Civil Protection Department, allowed the authors to achieve the results reported in this paper.

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Massimino, M.R., Abate, G., Corsico, S. et al. Comparison Between Two Approaches for Non-linear FEM Modelling of the Seismic Behaviour of a Coupled Soil–Structure System. Geotech Geol Eng 37, 1957–1975 (2019). https://doi.org/10.1007/s10706-018-0737-y

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