Numerical modelling of the seismic response of a tunnel-soil-aboveground building system in Catania (Italy)

Bull Earthquake Eng (2017) 15:469491

DOI 10.1007/s10518-016-9973-9

ORIGINAL RESEARCH PAPER

Glenda Abate1 Maria Rossella Massimino1

Received: 19 January 2016 / Accepted: 21 July 2016 / Published online: 28 July 2016 Springer Science+Business Media Dordrecht 2016

Abstract Seismic design of structures is commonly performed by using design spectra by national technical codes or, in some advanced designs, by using design acceleration time-histories given by 1D free-eld soil response analyses. These procedures can lead to erroneous evaluations of the real inputs, which hit aboveground and underground structures due to complex interactions involving the soil and the structures. Great attention has recently been devoted to separated tunnelsoil interaction analyses and soil-aboveground structure interaction analyses. Analyses involving tunnelsoilaboveground structures (full-coupled systems) are still very rare. The present paper deals with the dynamic interaction that occurs between a tunnel, the soil and an aboveground building, it also investigates the effects of the tunnel on the response of the soil and/or of the building and vice versa. The study has been performed using full-coupled FEM modelling. A case-history of the Catania (Italy) underground network has been analysed. A cross-section of the underground network in Catania including an aboveground building has been modelled, by studying its behaviour during the expected scenario earthquake (MS = 7.07.4).

The authors have investigated the seismic behaviour of the system in terms of acceleration time-histories, amplication ratios, Fourier amplitude spectra, as well as seismic bending moments and axial forces of the tunnel lining.

Keywords Full-coupled system Silty clays Expected scenario earthquake Soil-

nonlinearity Acceleration response Seismic tunnel lining forces

& Maria Rossella Massimino [email protected]

Glenda Abate [email protected]

1 Department of Civil Engineering and Architecture, University of Catania, Viale Andrea Doria 6,

95125 Catania, Italy

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List of symbolsa AccelerationC1 Coefcient for the evaluation of the predominant period of the building d Tunnel diameterD Damping ratioDl Damping ratio of tunnel

Ds Damping ratio of soil

De Epicenter distanceEs Soil Young elastic modulusEs0 Soil Young elastic modulus at small-strain Eb Building Young elastic modulusEl Lining Young elastic modulusF Flexibility ratiof1 First fundamental frequency of the inputf2 Second fundamental frequency of...