Seismic microzonation studies for the city of Ragusa (Italy)

Grasso, S.; Maugeri, M.

doi:10.1016/j.soildyn.2013.10.004

Cited by 26 publications

(10 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In sophisticated and appropriated structure design/retrofitting approaches the design spectra and/or the ground motion acceleration time-histories are derived by previous freefield (FF) site response analyses. The latter approach definitely represents an important step forward [Capilleri et al, 2003[Capilleri et al, , 2005Ferraro et al, 2016Ferraro et al, , 2018Grasso and Maugeri, 2014;Castelli et al, 2018a,b], taking into account the specific conditions of subsoil and its fundamental filtering effects in terms of PHA and predominant frequency. Nevertheless, dynamic response at the foundation level of a structure deviates from the FF site response, because of kinematic and inertial interaction [Gazetas, 1991;Massimino et al, 2015;Abate et al, 2017a, b;Karatzetzou et al, 2017] and in different cases dynamic soil-structure interaction (DSSI) could be detri-mental for the structures [Mylonakis et al, 2000;Pandey et al, 2012].…”

Section: Introductionmentioning

confidence: 99%

Dynamic behaviour of coupled soil-structure systems by means of FEM analysis for the seismic risk mitigation of INGV building in Catania (Italy)

Massimino¹,

Abate²,

Corsico³

et al. 2018

Annals of Geophysics

View full text Add to dashboard Cite

Seismic design of new structures, as well as retrofitting and/or improving of existing ones should be definitely considered a multidisciplinary subject, which depends on many factors, such as: local site effects and the dynamic interaction between the foundation soil and the structure. The accurate investigation on the structure and the surrounding soil is the first fundamental step for a realistic evaluation of the structure seismic performance. The present paper deals with the Dynamic Soil Structure Interaction (DSSI) analysis concerning the INGV (National Institute of Geophysics and Volcanology) building in Catania, by means of a FEM 2D modeling. The building is a prestigious masonry structure situated in an area characterized by a high seismic hazard. Several accelerograms scaled at the same PHA, with reference to the estimated seismicity of Catania, have been adopted. Soil properties were carefully investigated by means of static and dynamic in-situ and laboratory tests. Many investigations were also performed on the structure. Equivalent linear visco-elastic constitutive models have been adopted both for the soil and the structure. For considering soil nonlinearity, degraded shear modula (G) and increased soil damping ratios (D) have been evaluated for all the involved soil layers, according to two different approaches. Firstly, soil nonlinearity has been modeled basing on the EC8 [2003] suggestions; secondly, it has been modeled choosing the values of G and D according to the effective strain levels obtained for each soil layer and for each different input, by means of an iterative sub-routine. The dynamic response of the system has been analyzed in the time and frequency domains. Results are presented in terms of: acceleration amplification factors, Fourier and response spectra, amplification functions and shear forces per floor. The main goals of the paper are: i) to investigate the acceleration profiles along the soil and the structure considering and not considering the DSSI; ii) to investigate the soil filtering effect in terms of predominant frequency considering and not considering the DSSI; iii) to compare the obtained results with the ones given by a simpler 1D free-field soil analysis; iv) to compare the soil amplification factors and the response spectra obtained by 1D and 2D models with that by the Italian technical code [NTC, 2008]; v) to highlight the influence of DSSI in the seismic response of the structure; vi) to evaluate the influence of different modeling of soil nonlinearity on the dynamic response of the soil and structure.

show abstract

Section: Introductionmentioning

confidence: 99%

Dynamic behaviour of coupled soil-structure systems by means of FEM analysis for the seismic risk mitigation of INGV building in Catania (Italy)

Massimino¹,

Abate²,

Corsico³

et al. 2018

Annals of Geophysics

View full text Add to dashboard Cite

show abstract

“…Moreover, the use of a nonlinear analysis requires the determination of many parameters; it is therefore justified only in the presence of strong seismic inputs that lead to serious nonlinear phenomena in the soil. Results of these studies could be very useful to seismic microzonation [48][49][50].…”

Section: Discussionmentioning

confidence: 96%

The Role of Shear Wave Velocity and Non-Linearity of Soil in the Seismic Response of a Coupled Tunnel-Soil-Above Ground Building System

2019

View full text Add to dashboard Cite

The presence of tunnels close to aboveground structures may modify the response of these structures, while the contrary is also true, the presence of aboveground structures may modify the dynamic response of tunnels. In this context, the dynamic properties of the soil through which the aboveground and underground structures are “connected” could play an important role. The paper reports dynamic FEM (Finite Element Method) analyses of a coupled tunnel-soil-above ground structure system (TSS system), which differ in regards to the soil shear wave velocity and in turns for the damping ratio, in order to investigate the role of these parameters in the full-coupled TSS system response. The analyses were performed using three different seismic inputs. Moreover, the soil non-linearity was taken into account adopting two different constitutive models: i) an equivalent linear visco-elastic model, characterized by degraded soil shear moduli and damping ratios, according to suggestions given by EC8 in 2003; and ii) a visco-elasto-plastic constitutive model, characterized by isotropic and kinematic hardening and a non-associated flow rule. The seismic response of the system was investigated in the time and frequency domains, in terms of: acceleration ratios; amplification ratios and response spectra; and bending moments in the tunnel.

show abstract

“…This earthquake was preceded by a damaging foreshock on January 9. It had an estimated magnitude of 7.4 on the moment magnitude scale and a maximum intensity of XI on the MCS, destroying at least 70 towns and cities, seriously affecting an area of 5,600 square kilometers and causing the death of about 60,000 people [Grasso and Maugeri, 2009a, 2009b, 2014Castelli et al, 2016a. The earthquake was followed by tsunamis that devastated the coastal villages on the Ionian Sea and in the Straits of Messina.…”

Section: The Study Areasmentioning

confidence: 99%

Site effects evaluation in Catania (Italy) by means 0f 1-D numerical analysis

Ferraro¹,

Grasso²,

Massimino³

2018

Annals of Geophysics

View full text Add to dashboard Cite

In the period 2014-2016, a Project financed by the European Community was carried out to investigate the seismic hazard of some areas in eastern Sicily. Within this project, four strategic test sites in Messina [1) and Catania (3) have been studied, because of the fact that these cities are at high seismic risk [Abate et al., 2006; 2017]. Messina suffered the destructive earthquake of 1908 that caused thousands of deaths, injured and displaced, while Catania suffered, since 1169, a number of destructive earthquakes, among which we mainly remember the earthquakes of 1169, 1693, 1818 and 1990 [De Rubeis et al., 1991]. In order to study the dynamic characteristics of soils in three Catania test sites, laboratory and in situ investigations have been carried out to obtain soil profiles with special attention being paid to the variation

show abstract

Seismic microzonation studies for the city of Ragusa (Italy)

Cited by 26 publications

References 23 publications

Dynamic behaviour of coupled soil-structure systems by means of FEM analysis for the seismic risk mitigation of INGV building in Catania (Italy)

Dynamic behaviour of coupled soil-structure systems by means of FEM analysis for the seismic risk mitigation of INGV building in Catania (Italy)

The Role of Shear Wave Velocity and Non-Linearity of Soil in the Seismic Response of a Coupled Tunnel-Soil-Above Ground Building System

Site effects evaluation in Catania (Italy) by means 0f 1-D numerical analysis

Contact Info

Product

Resources

About