Sotiria Stefanidou

Sotiria Stefanidou
Aristotle University of Thessaloniki | AUTH · Division of Structural Engineering (D.S.E.)

PhD, MSc

About

59
Publications
20,349
Reads
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320
Citations
Citations since 2016
45 Research Items
269 Citations
2016201720182019202020212022020406080
2016201720182019202020212022020406080
2016201720182019202020212022020406080
2016201720182019202020212022020406080
Introduction
Dr. Sotiria Stefanidou is Post-Doctoral Researcher at the Institute of Engineering Seismology & Earthquake Engineering and at Civil Engineering Department, Aristotle Univ. of Thessaloniki (AUTh) in the field of Structural Dynamics and Earthquake Engineering. She received her PhD with Distinction in 2016 in fragility analysis of bridges (AUTh) and holds two MSc degrees in Earthquake Engineering (2007) and Natural disasters & climate change (2019).
Additional affiliations
January 2019 - July 2021
Institute of Engineering Seismology and Earthquake Engineering
Position
  • PostDoc Position
Description
  • Software development for the seismic protection of existing structures, methodology & software for inelastic pushover and time-history analysis of existing structures (R/C & masonry buildings) according to code provisions
October 2018 - February 2019
Aristotle University of Thessaloniki
Position
  • Master's Student
Description
  • Affiliate scientific staff MSc program: Earthquake engineering and seismic design of structures, module: Earthquake resistant design of RC structures, ASTE, Dept of Civil Eng, AUTh, Greece
October 2018 - January 2019
International Hellenic University
Position
  • Teaching Staff IHU
Description
  • Course: Retrofit and Repair of existing structures, Civil Engineering Department, IHU
Education
March 2019 - July 2019
Hellenic Open University
Field of study
  • Natural disasters and climate change
September 2009 - March 2016
Aristotle University of Thessaloniki
Field of study
  • Structure-specific fragility curves for as-built and retrofitted bridges
October 2006 - December 2007
Aristotle University of Thessaloniki
Field of study
  • Earthquake Engineering and Seismic Design of Structures

Publications

Publications (59)
Article
A new methodology for the development of bridge-specific fragility curves is proposed with a view to improving the reliability of loss assessment in road networks and prioritizing retrofit of the bridge stock. The key features of the proposed methodology are the explicit definition of critical limit state thresholds for individual bridge components...
Article
Full-text available
In seismic assessment of bridges the research focus has recently shifted on the derivation of bridge-specific fragility curves that account for the effect of different geometry, structural system, component and soil properties, on the seismic behaviour. In this context, a new, component-based methodology for the derivation of bridge-specific fragil...
Article
Full-text available
A new deformation-based design method concerning 3D reinforced concrete (R/C) buildings is presented, which involves the use of advanced analysis tools, i.e. response-history analysis for appropriately scaled input motions, for multiple levels of earthquake action. The critical issues concerning the inelastic response-history analysis used for the...
Article
Full-text available
A component-based seismic fragility analysis method for bridges recently developed by the authors is extended here to include the foundation component. In line with the treatment of other components like the piers or abutments, the foundation system is analysed separately, and its capacity and limit state thresholds are described in terms of the di...
Conference Paper
Full-text available
The reliable assessment of the expected seismic risk (losses of all nature), at urban, regional and national level, is extremely important for the State and the society and contributes to the proper management of the pre-earthquake crisis (interventions, strengthening of buildings and infrastructures), during the earthquake, but also post-seismic....
Conference Paper
Full-text available
Reliability of road systems and their critical components exposed to multiple natural hazards is on the frontline of engineering research during the last three decades since potential damage of infrastructure is strongly related to important direct and indirect economic losses. In this context, the research project INFRARES (www.infrares.gr) aims a...
Conference Paper
Full-text available
Tunnels and underground structures are constructed at an increasing rate in seismic prone areas to facilitate expanding transportation needs. The importance of these types of structures in modern societies, as well as the significant downtimes associated with seismically induced damage on them, led to an increasing interest of the scientific commun...
Article
Based on past earthquake events, bridges are the most critical and most vulnerable component of road and rail transport systems, while bridge damage is related to substantial direct and indirect losses. For the case of railway bridges, the estimation of seismic fragility is a rather complex and computationally demanding procedure given the real-ti...
Article
Transportation networks play a vital role in the economic prosperity of modern societies. Recent hazardous events in Greece, for instance, the 2021 Crete earthquake, the 2021 Thessaly earthquakes and floods, and the heavy 2019 rainfall in Crete, have revealed the vulnerability of roadway networks to natural hazards, resulting in severe physical dam...
Technical Report
Full-text available
Technical report with multiple authors (please refer to pdf), edited by Anastasios Sextos, Basil Margaris and Nikolaos Klimis. Coordinated by the Hellenic Association of Earthquake Engineering, the Institute of Engineering Seismology and Earthquake Engineering (ITSAK-EPPO) and Democritus University of Thrace with the collaboration of Aristotle Univ...
Poster
Full-text available
Research Project INFRARES - Newsletter #4 / February 2022
Article
Full-text available
Underground structures are being constructed at an increasing rate in seismic prone areas, to facilitate the expanding needs of societies. Considering the vital role of this infrastructure in densely populated urban areas and interurban transportation networks, as well as the significant losses associated with potential seismically induced damage,...
Article
Full-text available
Bridges are the most critical and usually the most vulnerable structural component of a road network exposed to various hazards. Damage due to recent earthquakes worldwide highlighted the substantial direct and indirect financial losses related to partial or total collapse of critical bridge components and pointed to the need for reliable assessmen...
Technical Report
Full-text available
On the morning of Tuesday, November 26, 2019, at 3:54 local time, an MW 6.4 earthquake struck 16 km north of Durrës, a port city on the Adriatic coast and the second largest city in Albania. The epicenter was 33 km northwest of Tirana, the largest city and capital of Albania. Deaths and injuries were concentrated in Durrës and the village of Thuman...
Conference Paper
Full-text available
Recent hazardous events in Greece, for instance, the 2021 Thessaly earthquake and floods, as well as the heavy 2019 rainfall in Crete, resulted in severe physical damage and important economic and societal losses, demonstrating the vulnerability of Greek roadway networks to natural hazards. Severe damage on bridges and tunnels of roadway networks i...
Poster
Full-text available
Research Project INFRARES - Newsletter #3 / November 2021
Conference Paper
Full-text available
Masonry is a composite material consisting of units (brick or stones) and mortar at head and bed joints, characterised by an overall anisotropic behaviour. Various approaches have been proposed for modeling and analysis of masonry, including both detailed and discretised (micro-modeling) and equivalent homogenisation (macro-modeling) techniques. Si...
Conference Paper
Full-text available
Roadway networks, playing a vital role in the economic prosperity of modern societies. Recent hazardous events in Greece, for instance, the 2021 Thessaly earthquake and floods and the heavy 2019 rainfall in Crete, have demonstrated the vulnerability of roadway networks to natu-ral hazards, resulting in severe physical damage and important economic...
Conference Paper
Full-text available
Based on past earthquake events, bridges are the most critical and usually the most vulnerable components of road and rail transport systems, while bridge damage is related to substantial direct and indirect losses. In view of this, the need for direct and reliable assessment of bridge vulnerability has emerged, and several methodologies have been...
Conference Paper
Full-text available
Based on past earthquake events, bridges are the most critical and usually the most vulnerable component of road and rail transport systems, while bridge damage is related to substantial direct and indirect losses. For the case of railway bridges, the estimation of seismic fragility is a rather complex and computationally demanding procedure due to...
Article
Bridge damage due to earthquakes and the subsequent direct and indirect losses lead to the incorporation of seismic design and retrofitting into recent design codes worldwide. Therefore, several retrofit schemes were introduced for the enhancement of the seismic performance concerning both the superstructure and substructure. The aim of the present...
Conference Paper
The ductility factor in terms of R/C cross-sections’ curvatures (μ1/r or μφ) possesses a significant role in the framework of the Greek code for structural intervention (KAN.EPE.). This factor is used for the classification of the verification methods in either those which are expressed in terms of forces or deformations, for the calculation of the...
Technical Report
Full-text available
Technical report of the Hellenic Association for Earthquake Engineering on the structural and geotechnical aspects of the 26/11/2019 Albania earthquake
Conference Paper
Full-text available
Seismic risk assessment at city scale has always been a useful tool for pre-earthquake planning, investment management and for retrofit prioritisation at the aftermath of a seismic event. Many methodologies are available for hazard analysis and seismic vulnerability estimation based on fragility curves available in literature. However, due to the d...
Article
Full-text available
Due to soil -structure-interaction (SSI), the seismic lateral structural deformations may be substantially different from the ones traditionally calculated from the fixed-base structure on free-field approach. Additionally, the actual displacements of foundations considering soil compliance are of practical interest in some applications. In the pre...
Conference Paper
Η φέρουσα τοιχοποιία είναι σύνθετο υλικό, που αποτελείται από λίθους (τούβλα) και κονίαμα σε οριζόντιους και κατακόρυφους αρμούς. Η προσομοίωση κτιρίων από φέρουσα τοιχοποιία είναι μία σύνθετη και πολύ απαιτητική διαδικασία και μπορεί να υλοποιηθεί με ισοδύναμα ραβδωτά στοιχεία, μακροστοιχεία ή επιφανειακά πεπερασμένα στοιχεία, ενώ διάφοροι νόμοι υ...
Conference Paper
The scope of this research paper is to describe the mathematical formulation and develop a holistic and consistent methodology for dynamic analysis of coupled high-speed train-railway bridges. In the frame of the methodology proposed herein, appropriate numerical (discretization) schemes are introduced based on a suitable weak form relation dully t...
Conference Paper
Full-text available
Boundary conditions play an important role in the response of bridges to different actions, particularly dynamic loads. Gap closure at end joints, resulting in activation of the abutment-backfill-embankment system, considerably affects the dynamic characteristics and, hence, the seismic response of the bridge. In particular, consideration of abutme...
Conference Paper
Full-text available
The new PPC Powerstation in Ptolemaida, Northern Greece, includes an asymmetric steel boiler house which comprises of an eccentrically braced central core combined with perimeter concentrically braced platforms, designed according to EC3 and EC8. The design by MHPSE provided for a 3D analysis of a condensed model, while the use of substructuring wa...
Conference Paper
Full-text available
The most common types of bridge decks are prestressed box girders and prestressed/precast I-beams for monolithic and simply supported bridges, respectively. The usual deck modeling approach for dynamic analysis is to form a spine of linear beam-column elements with lumped nodal masses, using uncracked stiffness for the prestressed deck. According t...
Conference Paper
Full-text available
A number of analytical methodologies have been developed over the last three decades for the seismic assessment of bridges and the derivation of fragility curves for ‘typical’ bridges. Only very recently, the research focus has shifted on the derivation of bridge-specific fragility curves, recognising that seismic assessment is affected by differen...
Conference Paper
Full-text available
During the last decades, numerous research studies recognize the complex seismic behavior of bridges when soil–structure interaction (SSI) is accounted for, proposing the consideration of SSI in the estimation of bridge fragility. Furthermore, bridge damage due to recent earthquakes worldwide and the relevant direct and indirect losses, highlight t...
Conference Paper
Full-text available
During the last three decades, a large number of analytical methodologies have been developed for the seismic assessment of bridges and the derivation of bridge fragility curves. However, recently, the research focus has shifted on the derivation of bridge-specific fragility curves, recognizing the effect of different geometry, structural system, c...
Conference Paper
Full-text available
The key objective of this paper is to extend a recently proposed by the authors component-based methodology for the derivation of as-built bridge-specific fragility curves to retrofitted bridges, with a view to evaluating the effect of different retrofit measures and techniques on the enhancement of seismic performance, and highlight the optimum re...
Conference Paper
Full-text available
Recognising the key role of bridges within a roadway network and the substantial direct and indirect losses related to bridge damage, a new methodology for the development of bridge-specific fragility curves is proposed, intended for application to the bridges forming part of a roadway network. with a view to estimating seismic losses in the networ...
Article
Full-text available
The paper presents a holistic approach for assessing and managing the seismic risk and potential loss in inter-urban highway networks in earthquake-prone areas. The vulnerability of all elements of the intercity transportation system (i.e., roads, bridges, abutments, retaining walls, and tunnels) is assessed considering the interdependency among th...
Conference Paper
Full-text available
The key objective of this paper is to quantify the effect of retrofitting a bridge using different retrofit techniques in terms of probabilistic seismic vulnerability curves (fragility curves). To this purpose, an analytical, component-based methodology is developed. The capacity of different bridge components (piers, bearings, abutments), retrofit...
Conference Paper
Full-text available
The key objective of this paper is to present a methodology for the selection of the appropriate retrofit scheme for bridges, based on the performance of different components (piers, bearings, abutments) with a view to upgrading the seismic performance of the system. The methodology is applied to a common bridge type, with monolithic pier-to-deck c...
Conference Paper
The study focuses on the seismic response of a straight, overpass bridge with two equal spans, whose fundamental mode, unlike most bridges of this type, is purely torsional. The particular structure is supported on a two-column pier of cylindrical cross-section that is monolithically connected to the deck, while it rests on its two abutments throug...
Article
Full-text available
The study addresses the issue of pushover analysis of bridges sensitive to torsion, using as a case-study a straight, overpass bridge with two equal spans, whose fundamental mode is purely torsional. The deck is supported on a single pier consisting of two columns of cylindrical cross-section, monolithically connected to the deck, while it rests on...
Article
Full-text available
A deformation-based design method concerning 3D reinforced concrete (R/C) buildings is presented, which involves response-history analysis for multiple levels of earthquake action, using a partially inelastic model; the design of structural members is carried out for different performance levels related to their inelastic behaviour. A new procedure...
Conference Paper
Full-text available
A performance-based design procedure for realistic 3D reinforced concrete (R/C) buildings is presented, that involves the use of advanced analytical tools, i.e. time-history analysis for appropriately scaled input motions, for two different levels of earthquake action. The critical issues of defining appropriate input for inelastic dynamic analysis...

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Projects

Projects (12)
Project
Integrated technological platform for the management/ facilitation of the operational processes of the local government organizations in the framework of their duties for civil protection and of the potentially affected local businesses for the improvement of societies’ resilience to natural disasters
Project
INFRARES will deliver a comprehensive methodology towards a more efficient risk and resilience assessment of roadway networks in Greece subjected to natural hazards. Particular emphasis will be placed on the assessment of bridges and tunnels subjected to independent and/or multiple subsequent natural hazards. Relevant analytical frameworks will be developed for this purpose. The outcomes of the project will be disseminated via relevant newsletters and technical guidelines to engage interested Stakeholders, Operators and Consultancies. In addition, a software will be developed, allowing for an easier implementation of the proposed methodology. The whole approach will be applied to a roadway network of Western Macedonia, i.e., part of Egnatia Odos, to present an example of implementation and validate the efficiency of the methodology. More information may be found at: https://www.infrares.gr
Project
The project is a Postdoctoral IKY Foundation Scholarship. The aim of the project is to use genetic algorithms and develop a multiobjective optimization framework for the selection of optimum bridge retrofit techniques using fragility curves of as built and retrofitted bridges. The methodology will be extended to bridges exposed to multiple hazards (earthquake, flood, etc.)