Kyriazis Pitilakis

Kyriazis Pitilakis
Aristotle University of Thessaloniki | AUTH · School of Civil Engineering

Professor

About

374
Publications
154,397
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8,319
Citations
Citations since 2017
65 Research Items
5376 Citations
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201720182019202020212022202302004006008001,000
201720182019202020212022202302004006008001,000
201720182019202020212022202302004006008001,000

Publications

Publications (374)
Article
Seismic risk assessment involves many uncertainties starting from the exposure model and the evaluation of site-specific seismic hazard, and ending with the actual estimation of the expected damages and losses. Seismic risk is also explicitly related to a reliable decision-making process in order to improve pre- and post earthquake management and r...
Article
Tunnels are critical infrastructure for the sustainable development of urban areas worldwide, especially for modern metropolises. This study investigates the effects of salient parameters, such as the soil conditions, tunnel burial depth, tunnel construction quality, and aging phenomena of the lining, on the direct seismic losses of circular tunnel...
Conference Paper
Full-text available
2011, συμπεριλαμβάνεται στο Κυπριακό Εθνικό προσάρτημα του Ευρωκώδικα 8 και περιλαμβάνει τρεις ζώνες με μέγιστη εδαφική επιτάχυνση PGA 0,15g, 0,20g και 0,25g. Στην παρούσα εργασία προτείνεται ένας νέος σεισμικός χάρτης για την Κύπρο, βασισμένος στα αποτελέσματα του πλέον πρόσφατου Ευρωπαϊκού Μοντέλου Σεισμικής Επικινδυνότητας 2020 (European Seismic...
Conference Paper
Full-text available
2003 με την τροποποίηση των σχετικών διατάξεων του Ελληνικού Αντισεισμικού Κανονισμού ΕΑΚ 2000. Ο ισχύων χάρτης περιλαμβάνει τρεις ζώνες με μέγιστη εδαφική επιτάχυνση PGA 0,16g, 0,24g και 0,36g. Στην παρούσα εργασία προτείνεται ένας νέος σεισμικός χάρτης για την Ελλάδα, βασισμένος αφενός μεν στο Ευρωπαϊκό Μοντέλο Σεισμικής Επικινδυνότητας 2020 (Eur...
Conference Paper
Full-text available
Acropolis of Athens, World Heritage Site since 1987, is one of the most prestigious ancient monuments symbolizing the values and achievements of the classical Greek civilization. This paper discusses the investigation of the potential impact of low to very low probability earthquakes to the safety and resilience of the Acropolis of Athens and its w...
Conference Paper
Full-text available
Η προστασία σχολικών κτιρίων και άλλων κρίσιμων υποδομών έναντι σεισμού και λοιπών φυσικών κινδύνων είναι θέμα ζωτικής σημασίας για την πολιτική προστασία και την κοινωνία γενικότερα. Η ασφάλεια των μαθητών, των δασκάλων και λοιπών εργαζομένων, όπως και των ίδιων των σχολικών κτιρίων αποτελεί βασική προτεραιότητα. Το ερευνητικό πρόγραμμα SafeSchool...
Article
The aim of this paper is to investigate whether existing generic fragility curves for various residential building typologies can be safely applied for the vulnerability assessment of school buildings. We select three representative typologies of actual reinforced concrete (RC) school buildings in Thessaloniki, Greece and we conduct a detailed frag...
Conference Paper
There is an increasing awareness of the importance of sustainable retrofitting of existing buildings for achieving climatic and energy objectives in the EU. The energy consumed in buildings, and in general, in the construction sector, is one of the most significant sources of CO2 emissions in Europe. In specific areas, when planning retrofit interv...
Conference Paper
Full-text available
The seismic performance and safety of major European industrial facilities has a global interest for Europe, its citizens and economy. A potential major disaster at an industrial site could affect several countries, probably far beyond the country where it is located. However, the seismic design and safety assessment of these facilities is practica...
Conference Paper
Full-text available
The current seismic hazard zonation map in Greece, published in 2003 following the catastrophic earthquakes that hit Greece between 1978 and 2001, includes three seismic hazard zones with PGA ranging between 0.16g and 0.36g. In the last two decades, a significant progress has been made towards the improvement of the seismic hazard maps worldwide us...
Conference Paper
The reliable seismic vulnerability assessment of school buildings is of paramount importance to increase the safety of the school community and to allow the deployment of efficient and appropriate mitigation actions. Generic fragility curves for typical residential buildings are not always appropriate for school buildings which present several part...
Conference Paper
The SafeSchools project aims at developing and pioneering an innovative system for early warning, real-time damage assessment, and protection of critical buildings like schools against an upcoming earthquake, which, with minor adaptations, can also be used for other natural disasters. The aim is to create a user-friendly real-time risk assessment t...
Conference Paper
The protection of schools and critical infrastructure against earthquake and other natural hazards is a subject of first priority, especially for Greece. We briefly describe herein SafeSchools system for earthquake early warning and real-time risk assessment of school buildings against earthquakes implemented in the framework of SafeSchools project...
Conference Paper
Civil protection against earthquakes and other natural hazards is a subject of first priority, especially in Greece. We briefly describe herein the main components of an innovative system for earthquake early warning and real-time risk assessment of school buildings against earthquakes, which has an open architecture to be directly extended for oth...
Article
Fragility functions are used in the vulnerability analysis of structures considering different sources of uncertainties. In this research, a framework to develop time-dependent fragility functions for circular tunnels embedded in soft soils is proposed considering the impact of corrosion on the lining reinforcement. Typical shallow and deep circula...
Preprint
There is an increasing awareness of the importance of sustainable retrofitting of existing buildings for achieving climatic and energy objectives in the EU. The energy consumed in buildings, and in general, in the construction sector, is one of the most significant sources of CO2 emissions in Europe. In specific areas, when planning retrofit interv...
Article
The presence of capillary pressure in unsaturated soils may, under certain circumstances, significantly affect the stability of a slope and the safety of a structure standing in the vicinity of its crest. More specifically, the change in saturation induced by a rainfall event may directly influence the value of apparent soil cohesion potentially re...
Article
This study aims to identify optimal intensity measures (IMs) for use in probabilistic seismic demand models (PSDMs) for circular tunnels in soft soil deposits. To this end, we performed an extended numerical parametric study involving two-dimensional time history analyses of selected soil-tunnel configurations to evaluate the response of the select...
Article
Geotechnical seismic isolation (GSI) system involves the dynamic interaction between structure and low‐modulus foundation material, such as rubber‐soil mixtures (RSM). Whilst numerical studies have been carried out to demonstrate the potential benefits of GSI‐RSM system, experimental research is indispensable for confirming its isolation mechanism...
Conference Paper
Full-text available
Quay walls are one of the key elements of the port facilities. Experience obtained from past strong seismic events has demonstrated the increased seismic vulnerability of port facilities due to ground shaking as well as the important economic and societal losses (e.g. the 1995 Kobe earthquake. The most significant source of earthquake-induced damag...
Conference Paper
Full-text available
Η εκτίμηση της αναμενόμενης σεισμικής τρωτότητας και διακινδύνευσης είναι ιδιαίτερα σημαντική, καθώς παρέχει στην Πολιτεία τις απαραίτητες πληροφορίες για τη λήψη αποφάσεων σχετικών με τον περιορισμό των δυσμενών συνεπειών ενός καταστροφικού σεισμού. Στην εργασία αυτή προτείνεται μια μεθοδολογία εκτίμησης της σεισμικής διακινδύνευσης πόλεων, η οποί...
Conference Paper
Full-text available
The accurate knowledge of the geological, geotechnical, geophysical and geometrical characteristics of soil conditions at urban area, usually obtained through microzonation studies, is generally important to the seismic hazard and risk assessment, and consequently for decision-making with respect to the reduction of earthquake-induced losses and in...
Conference Paper
A European seismic risk model will be released in 2020 as an output of the European Horizon 2020 SERA project (www.sera-eu.org), building also upon the research efforts of many previous projects (e.g. LESSLOSS, SYNER-G, NERA, SHARE). The main risk metrics that will be released with the model include national and sub-national maps of average annual...
Conference Paper
Full-text available
Seismic vulnerability and risk assessment are of major importance for decision-making with respect to the reduction of earthquake-induced losses at local, urban, national and even continental scale, as well as for the insurance industry. In the framework of the H2020 EU SERA project (http://www.sera-eu.org/en/home/), an effort is being made to deve...
Article
View-only link: https://rdcu.be/b5D5i This study examines the use of granular soils mixed with tire derived aggregates (TDA) as an underlying soil layer for surface foundations. The benefit of this geotechnical seismic isolation (GSI) scheme is threefold: the seismic force and displacement are significantly reduced; the construction is similar to...
Article
This paper aims at the vulnerability assessment of circular tunnels in soft soil deposits of the metropolitan subway system of Shanghai, accounting for the effects of soil-structure-interaction, local soil conditions and tunnel burial depth. The study focuses on the seismic vulnerability in the transversal direction. A suite of twelve earthquake re...
Conference Paper
Full-text available
Στην παρούσα εργασία διενεργείται μια παραμετρική πιθανοτική εκτίμηση της σεισμικής επικινδυνότητας για το πολεοδομικό συγκρότημα της Θεσσαλονίκης. Ιδιαίτερη έμφαση δόθηκε στη μελέτη του τρόπου με τον οποίο λαμβάνονται υπόψη οι τοπικές εδαφικές συνθήκες στην εκτίμηση της σεισμικής επικινδυνότητας, αξιοποιώντας την πολύ καλή γεωτεχνική τεκμηρίωση πο...
Conference Paper
Full-text available
Στην παρούσα εργασία παρουσιάζεται ένα νέο σύστημα εδαφικής κατηγοριοποίησης, το οποίο χρησιμοποιεί ως βασικές παραμέτρους το πάχος της εδαφικής απόθεσης και την Vs,30, ενώ εισάγεται ως συμπληρωματική παράμετρος και η ιδιοπερίοδος της εδαφικής απόθεσης. Για τις νέες κατηγορίες προτείνονται κατάλληλα ελαστικά φάσματα απόκρισης, για τον ορισμό των οπ...
Conference Paper
Full-text available
Η παρούσα έκδοση του Ευρωκώδικα 8 λαμβάνει υπόψη την επιρροή των τοπικών εδαφικών συνθηκών μέσω της χρήσης κατάλληλων φασμάτων ελαστικής απόκρισης που εξαρτώνται, εκτός άλλων, από την εδαφική κατηγορία. Ως κύρια παράμετρος εδαφικής κατηγοριοποίησης χρησιμοποιείται η μέση ταχύτητα στα ανώτερα 30 μέτρα της εδαφικής στήλης (Vs,30), η οποία, παρά τα πλ...
Conference Paper
Full-text available
Η αποτίμηση της αναμενόμενης σεισμικής τρωτότητας είναι ιδιαίτερα σημαντική, καθώς παρέχει στην Πολιτεία τις απαραίτητες πληροφορίες για τη λήψη αποφάσεων σχετικών με τον περιορισμό των δυσμενών συνεπειών ενός καταστροφικού σεισμού. Στην παρούσα εργασία, αναπτύσσεται μια μεθοδολογία αποτίμησης της σεισμικής τρωτότητας πόλεων, η οποία συνίσταται κατ...
Conference Paper
Full-text available
Η παρούσα εργασία αποτελεί μια πρακτική εφαρμογή των κύριων βημάτων ανάλυσης και διαχείρισης της σεισμικής διακινδύνευσης πολεοδομικών ενοτήτων αποτελούμενων από κτίρια με κύρια χρήση την κατοικία. Η εφαρμογή πραγματοποιείται σε μια κεντρική περιοχή του πολεοδομικού συγκροτήματος της Θεσσαλονίκης και περιλαμβάνει 23 οικοδομικά τετράγωνα. Αρχικά, εκ...
Conference Paper
This paper presents a numerical study to develop fragility curves for shallow tunnels in soft deposits of Shanghai, considering the effect of soil-structure-interaction and local soil conditions. For this purpose, a series of two-dimensional (2D) numerical models with typical soil-tunnel configurations of the metro network in Shanghai is initially...
Conference Paper
Full-text available
Seismic risk assessment and loss estimation are of major importance for decision-making with respect to the reduction of earthquake-induced losses at local, national and even continental scale. In this study we present a preliminary model, the components of which could be used for the probabilistic seismic risk assessment of the residential buildin...
Conference Paper
There is an increasing requirement for effective evaluation, management and mitigation of the seismic risk of buildings and infrastructures considering not only the seismic ground shaking itself but also some of the most destructive collateral hazards associated with earthquakes, namely landslides, liquefaction and tsunami. In this respect an analy...
Conference Paper
Full-text available
This study describes the development of the various components of the European Seismic Risk Model 2020 (ESRM2020) which will be able to generate, using open-source software developed by the GEM Foundation (the
Article
An engineering risk-based methodology for stress testing critical infrastructures is introduced and applied to the port of Thessaloniki in Greece exposed to seismic, geotechnical and tsunami hazards. The methodology workflow consists of four phases: Pre-Assessment, Assessment, Decision and Report phase. In the pre-assessment phase, all the necessar...
Poster
Full-text available
The European Geotechnical Database (EGD) is one of the few EPOS services that are not already mature but are being designed and developed entirely within the EPOS-IP project and more specifically within Task 8 on “Hazard and Risk” of the project. The aim of EGD is to evolve to “a Europe-wide geotechnical, geological and site conditions inventory, c...
Article
Harbours are crucial assets for the sustainment and development of human activities. The recent devastating tsunami events as well as the increasing number of people, structures and economic activities being exposed to tsunami hazards revealed the need for the estimation of the effects of tsunami wave on seaport structures. However, only a limited...
Conference Paper
The aim of this paper is to develop a seismic risk assessment study of urban infrastructural systems relying on state-of-the-art tools for the prediction of earthquake ground motion as well as the assessment of vulnerability. The proposed approach makes use, on one hand, of 3D physics-based numerical simulations of source-to-site wave propagation p...
Conference Paper
Full-text available
In the context of the STREST project (http://www.strest-eu.org/), an engineering multi-level risk-based methodology to stress test critical non-nuclear infrastructures has been developed. This paper summarizes the STREST framework and its exploratory application to six key representative Critical Infrastructures in Europe, exposed to variant hazard...
Conference Paper
Full-text available
Lessons learnt from recent strong seismic events have demonstrated that even moderate levels of earthquake intensity can cause liquefaction, potentially leading to induced soil settlements and lateral spreading that may result to severe physical damages and important economic and societal losses. However, the published literature in the evaluation...
Conference Paper
Full-text available
While lessons learnt from recent devastating tsunami events revealed the need for the estimation of the effects of tsunami wave on coastal structures, only a limited number of tools to estimate the potential impacts of tsunami are available until now. This study aims at developing an efficient analytical methodology for assessing the vulnerability...
Conference Paper
Full-text available
The paper presents a preliminary study of the seismic hazard of the Acropolis of Athens, a World Heritage Site since 1987, and the seismic response of some of its classical monuments. The objectives are threefold. The first is to perform both probabilistic and deterministic seismic hazard analysis simulating the expected strong ground motion from e...
Article
While liquefaction has been widely recognized as being one of the principal earthquake hazards resulting to significant economic and societal losses, research in the vulnerability assessment and quantitative evaluation of the expected physical damages to building structures is rather limited. In this respect, this study aims at the vulnerability as...
Article
Full-text available
The paper presents an alternative site classification scheme and associated intensity dependent spectral amplification factors, aiming to contribute to the ongoing revision of Eurocode 8. The new classification scheme, introducing among the main classification parameters the fundamental period T0 of the site, is an evolution of the recent work by P...
Article
Full-text available
During the last 2 decades experimental and theoretical studies have striven to evaluate the use of granulated rubber as a construction material in civil engineering applications. Several geotechnical structures using soil/rubber mixtures or clean granulated rubber proved the efficiency of this solution. In the framework of site seismic response ana...
Article
The R-F method is commonly implemented in design practice to evaluate the response of rectangular tunnels subjected to ground seismic shaking in the transversal direction. The efficiency of the method depends significantly on the so-called R-F relations, which correlate the flexibility ratio, F, expressing the soil to tunnel relative stiffness, wit...
Article
Full-text available
Seismic risk assessment and loss estimation are of major importance for decision-making with respect to the reduction of earthquake-induced losses in large urban areas. However, the methodological chain of seismic risk assessment, from seismic hazard assessment to evaluation of potential losses, encompasses both aleatory and epistemic uncertainties...
Article
Full-text available
The present study aims at the assessment of the seismic vulnerability of reinforced concrete (RC) buildings considering performance degradation over time due to aging effects. Chloride induced corrosion is taken into account based on probabilistic modeling of corrosion initiation time and corrosion rate. Two-dimensional incremental dynamic analysis...
Article
Full-text available
Greek classical temples constitute monuments of great historical and architectural value. The majority of them remain nowadays as free-standing multi-drum or monolithic columns or portals. Their present typology, in addition to their slenderness, render their response to seismic ground shaking quite distinct compared to that of modern structures. R...
Article
Full-text available
This study aims at the proposition of a probabilistic framework for the vulnerability assessment of reinforced concrete (RC) buildings subjected to seismically induced slope displacements due to landslide hazard. The proposed approach combines the seismic hazard analysis with the displacement hazard analysis and the fragility analysis of the struct...
Article
Full-text available
Strong motion data recorded during the 15-year operation of the CORinth Gulf Soft Soil Array (CORSSA) in the highly seismic region of Aegion have been homogenized and organized in a MySQL database. In the present work we describe the contents of the database and the web portal through which these data are publicly accessible. CORSSA comprises one s...
Article
Full-text available
This study aims at showing the numerical modelling of earthquake ground motion in the Thessaloniki urban area, using a 3D spectral element approach. The availability of detailed geotechnical/geophysical data together with the seismological information regarding the relevant fault sources allowed us to construct a large-scale 3D numerical model suit...
Conference Paper
Tunnels constitute critical components of the utility and transportation networks of urban areas. In this context, their seismic design in seismic prone areas is of great importance. Several features of this type of constructions render their seismic behavior distinct compared to that of above ground structures, while critical issues related to thi...
Article
The paper presents a numerical approach for the construction of seismic fragility curves for shallow metro tunnels considering the soil-structure-interaction (SSI) and the aging effects due to corrosion of the lining reinforcement. The tunnel response under ground shaking is evaluated through 2D non-linear dynamic analyses, for increasing levels of...
Article
This study examines the small-strain stress-strain properties during cyclic loading of Lanzhou loess deposits, characterized by a very high void ratio (>0.9). Torsional resonant column (RC) tests are performed in order to investigate the effect of water content, confining pressure, consolidation time and soil structure strength on the small-strain...
Article
Full-text available
In this study earthquake ground motion in the Thessaloniki urban area is evaluated using a 3D spectral element numerical approach. The availability of detailed geotechnical/geophysical data from past microzonation studies together with the seismological information regarding the relevant fault sources allowed for the creation of a large-scale 3D nu...
Article
At present, the seismic vulnerability of reinforced concrete (RC) buildings standing in the vicinity of the slope's crest is assessed ignoring, in most cases, the effect of topography and the potential slope instability. This study aspires to investigate these effects by proposing a methodological framework for assessing the vulnerability of typica...
Article
Full-text available
Seismic risk assessment and loss estimation are of major importance for decision-making with respect to the reduction of earthquake-induced losses in large urban areas. However, the methodological chain of seismic risk assessment, from seismic hazard assessment to evaluation of potential losses, encompasses numerous uncertainties, both aleatory and...
Conference Paper
A new engineering risk based methodology for stress tests named ST@STREST developed in the context of the European project STREST (www.strest-eu.org) for non-nuclear critical infrastructures (CIs) is applied to the port of Thessaloniki in North Greece. This case study is a characteristic example of distributed and/or geographically extended infrast...
Article
Full-text available
Transportation infrastructures are complex systems of various connected components like bridges, roads, tunnels, embankments, retaining walls in case of a highway system or wharfs, cranes, buildings, utility systems in case of port facilities. Due to their spatial extent, they are exposed to variable natural hazards such as earthquakes, tsunami or...
Article
Full-text available
Strong motion data that have been recorded during the 20-years of operation of the permanent network of EUROSEISTEST (Mygdonia basin, Northern Greece) have been homogenized and organized in an easily accessible, via the web, database. The EUROSEISTEST web portal and the application server running underneath are based solely on free and open source...
Article
Full-text available
Although many numerical and instrumental studies over the last decades have focused on studying the effects of subsurface geometry on seismic ground motion, it has not yet been feasible to incorporate such effects into regular engineering practice, seismic building codes, earthquake hazard assessment and risk mitigation policies. In the present wor...
Article
Full-text available
The paper discusses the seismic response of circular tunnels in dry sand and investigates the efficiency of current seismic analysis methods at extreme lining flexibilities. Initially, a dynamic centrifuge test on a flexible circular model tunnel, embedded in dry sand, is analyzed by means of rigorous full dynamic analysis of the coupled soil–tunne...
Article
Full-text available
This study aims at presenting the analyses of monitoring data that have been used in the context of structural monitoring and Earthquake Early Warning (EEW) for a hospital building in Thessaloniki. Permanent and temporary instrumentation arrays, implemented under the responsibility of Aristotle University of Thessaloniki (SDGEE-AUTH) in close coope...
Article
A series of dynamic centrifuge tests were carried out at the geotechnical centrifuge facility of IFSTTAR in Nantes, to investigate the response of box-type tunnels embedded in dry sand under sinusoidal and seismic excitation, as affected by soil-tunnel relative flexibility and soil-structure interface rugosity. The system under investigation was an...
Article
The paper investigates the seismic response of square tunnels in sand by means of dynamic centrifuge testing and numerical analysis. A series of dynamic centrifuge tests, conducted at the University of Cambridge on a square aluminium model tunnel embedded in dry sand, are initially presented. The tests, which were designed to investigate the seismi...
Article
The paper investigates the seismic response of square tunnels in sand by means of dynamic centrifuge testing and numerical analysis. A series of dynamic centrifuge tests, conducted at the University of Cambridge on a square aluminium model tunnel embedded in dry sand, are initially presented. The tests, which were designed to investigate the seismi...
Conference Paper
Tunnels constitute crucial components of the transportation and utility networks of urban areas. Several features of this type of constructions render their seismic behavior distinct compared to above ground structures, while crucial issues related with the above behavior are still open, calling for further investigation. This paper summarizes the...