Grigorios Tsinidis

University of Thessaly | UTH

A numerical parametric study was conducted on diverse soil-rectangular tunnel systems, aiming to shed light on critical response characteristics of rectangular tunnels subjected to transversal ground shaking. Salient parameters that affect the dynamic response, such as: (i) the soil-tunnel relative stiffness and interface properties, (ii) the shape...

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...

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...

A series of dynamic centrifuge tests were performed on a flexible aluminium square tunnel model embedded in Hostun dry sand. The tests were carried out at the centrifuge facility of the University of Cambridge in order to further improve knowledge regarding the seismic response of rectangular embedded structures and to calibrate currently available...

The paper summarizes the numerical simulation of the round robin numerical test on tunnels performed in Aristotle University of Thessaloniki. The main issues of the numerical simulation are presented along with representative comparisons of the computed response with the recorded data. For the simulation, the finite element method is implemented, u...

Underground structures (e.g., tunnels, subway stations, underground parking lots, etc.) are increasingly constructed in seismic-prone areas to facilitate the expanding needs of modern societies. The significant downtimes and the accompanying costs associated with seismically induced damage to underground structures led to an increasing interest of...

Highway transportation networks play a vital role in today's economic and societal life and affect growth and employment. Hence, their undisrupted functionality and their quick recovery even after extreme natural hazard events are critical. To this end, resilience assessment of transportation networks against natural hazards is needed for decision-...

Transport infrastructure is the backbone of the economy and society, while at the same time is exposed to multiple hazards. Previous natural disasters, including earthquakes, had a significant impact on transport networks with severe consequences for the users and supply chain. In this context, the resilience assessment of critical assets such as t...

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...

Research Project INFRARES - Newsletter #6 / July 2022

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...

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...

Research Project INFRARES - Newsletter #5 / May 2022

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...

Research Project INFRARES - Newsletter #4 / February 2022

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,...

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...

Research Project INFRARES - Newsletter #3 / November 2021

Newsletter #2 / September 2021

Recent earthquakes have shown that tunnels are prone to damage, posing a major threat to safety and having major cascading and socioeconomic impacts. Therefore, reliable models are needed for the seismic fragility assessment of underground structures and the quantitative evaluation of expected losses. This paper builds on previous research and pres...

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...

Newsletter #1 / June 2021

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...

The paper presents a state-of-the-art review of the current understanding of the seismic behaviour of tunnels. Emphasis is placed on recorded responses of actual tunnels during past earthquakes, as well as relevant experimental studies. In particular, the observed seismic performance of tunnels is initially discussed, by providing cases of reported...

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...

This paper presents an extended set of numerical fragility functions for the structural assessment of buried steel natural gas (NG) pipelines subjected to axial compression caused by transient seismic ground deformations. The study focuses on NG pipelines crossing sites with a vertical geotechnical discontinuity, where high compression straining of...

The socio-economic and environmental impact, in case of severe damage on Natural Gas (NG) pipeline networks, highlights the importance of a rational assessment of the structural integrity of this infrastructure against seismic hazards. Up to date, this assessment is mainly performed by employing empirical fragility relations, while a limited number...

The paper presents a numerical methodology for the vulnerability assessment of buried steel natural gas (NG) pipelines, subjected to differential transient ground deformations, stemming from abrupt lateral site inhomogeneities. Idealized systems are considered, consisting of embedded steel NG pipelines crossing sites with vertical geotechnical disc...

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...

The paper investigates the dynamic interaction between a metro station and a building with basement, prospecting the station, when subjected to seismic excitation in the transversal direction. A real case study of the under-construction metro in Thessaloniki, Greece is actually analyzed under plane strain conditions, employing ABAQUS, with the buil...

This article investigates the response of Integral Abutment Bridges (IAB) when subjected to a sequence of seasonal thermal loading of the deck followed by ground seismic shaking in the longitudinal direction. Particular emphasis is placed on the effect of pre-seismic thermal Soil-Structure Interaction (SSI) on the seismic performance of the IAB, as...

Steel gas pipelines may be subjected to buckling failure under large compressive straining, caused by seismically induced ground deformations. This paper further elaborates on the buckling response of this type of networks, through the presentation of representative results from a series of axial compression static analyses that were conducted on s...

Ancient classical temples constitute common historic monuments of great archaeological value. Many of these monuments remain nowadays as free-standing columns or colonnades. This study aims to shed light on the efficiency of various seismic intensity measures of the base excitation to predict the stability of classical columns and colonnades subjec...

It is common in tunnelling practice to evaluate the response of rectangular tunnels under transversal ground shaking, using the R-F analysis method. Critical for the efficiency of the method is the racking ratio, R, which is introduced to account for the soil-structure interaction effects in evaluation of the tunnel response and is commonly related...

The response of tunnels subjected to ground seismic shaking is commonly evaluated, disregarding the existence of other structures in the near area. However, significant interaction phenomena may take place between the tunnel and existing structures in dense urban environments, altering the seismic response of the tunnel compared to the one predicte...

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...

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...

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...

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...

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...

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...

A numerical parametric study is conducted on various soil-tunnel systems, aiming to investigate the complex deformation modes of rectangular tunnels, subjected to ground shaking in the transversal direction. Salient parameters that affect the dynamic response, such as: (i) the soil-tunnel relative stiffness and interface properties, (ii) the shape,...

A series of dynamic centrifuge tests were conducted on square aluminum model tunnels embedded in dry sand. The tests were carried out at the Schofield Centre of the Cambridge University Engineering Department, aiming to investigate the dynamic response of these types of structures. An extensive instrumentation scheme was employed to record the soil...

2016, Springer International Publishing Switzerland. A series of dynamic centrifuge tests were conducted on square aluminum model tunnels embedded in dry sand. The tests were carried out at the Schofield Centre of the Cambridge University Engineering Department, aiming to investigate the dynamic response of these types of structures. An extensive i...

A series of dynamic centrifuge tests were performed on a flexible aluminium square tunnel model embedded in Hostun dry sand. The tests were carried out at the centrifuge facility of the University of Cambridge in order to further improve knowledge regarding the seismic response of rectangular embedded structures and to calibrate currently available...

An Ionic multi-drum column was restored at the Akropolis of Lindos in Rhodes, Greece, as part of the Psithiros Gallery. This paper discusses the numerical investigation of the response of the column under seismic loading and extreme wind loads. The problem was studied by means of 3D full dynamic time history analyses of the column. For this purpose...

A series of dynamic centrifuge tests was performed on a rectangular tunnel model embedded in dry sand at the centrifuge facility of the University of Cambridge. An extensive instrumentation array was implemented to monitor the soil-tunnel response, which comprised of miniature accelerometers, pressure cells and position sensors in addition to strai...

Earthquake case histories of soil response over the last 70 years reveal the strongly non-linear hysteretic behaviour of soils. Over the years, numerous efforts have been made to represent more realistically soil response in the strongly nonlinear range. The paper studies three particular sites in the Hokkaido island during the MJMA8.0, 26 Septembe...

A series of dynamic centrifuge tests performed at the geotechnical centrifuge facility of IFSTTAR in Nantes, on rectangular model tunnels embedded in dry sand is presented. The effect of salient model parameters such as soil-to-tunnel relative flexibility, soil-structure interface properties and characteristics of the input motion is explored. Repr...

The paper presents a series of dynamic centrifuge tests that were carried out at the geotechnical centrifuge facility of the University of Cambridge, on a rectangular model tunnel embedded in dry sand. The tests are simulated by means of finite-element analysis of the coupled soil-tunnel system and the numerical results are compared and validated w...

A series of dynamic centrifuge tests on rectangular tunnel models embedded in dry and saturated sands is presented. The tests were carried out at the geotechnical centrifuge facility of IFSTTAR in Nantes, France, within the Transnational Access action DRESBUS II funded by the SERIES research project. The experimental program focused on salient para...

The Chapter summarizes representative experimental results from dynamic centrifuge tests that were performed on square model-tunnels embedded in dry sand. Two model-tunnels were used, a rigid and a flexible one, with the latter model collapsing during the test. The tests were carried out at the geotechnical centrifuge facility of the University of...

The paper presents representative experimental data from a series of dynamic centrifuge tests that carried out on a rectangular tunnel-model embedded in dry sand, at the University of Cambridge. The test case is analyzed by means of full dynamic analysis of the coupled soil-tunnel system within the calibration of the numerical models. The calibrate...

The paper discusses the effect of above-ground structures on the transversal seismic response of shallow tunnels in urban areas. For this purpose, a numerical parametric study is carried out on representative tunnel-soil-above ground structures systems, with the latter being simulated in a simplified way as simple-degree of freedom oscillators. Sev...

The paper presents experimental results from a series of dynamic centrifuge tests that were performed on rectangular tunnel models embedded in dry sand. Representative test cases are numerically simulated by means of full dynamic time history analysis of the soil-tunnel system and the numerical predictions are compared with the experimental data wi...

Soil-structure interaction phenomena are significantly affecting the seismic behavior and vulnerability of tunnels in soft soils. The paper presents numerical fragility curves that are computed from dynamic time history analyses of representative circular tunnels-soil systems. The mechanical properties of the tunnel lining, the characteristics of t...

A series of dynamic centrifuge tests performed on rectangular tunnel models embedded in dry sand is presented. The tests were carried out at the geotechnical centrifuge facility of IFSTTAR in Nantes. Among the innovative features of the experimental campaign is the implementation of a real earthquake recording as the base motion. The effect of sali...

The paper presents a numerical approach for the construction of fragility curves for shallow metro tunnels considering the soil-structure-interaction (SSI) and the aging effects due to corrosion in the lining behaviour. In particular, the proposed methodology is presented and applied on a representative soil-tunnel system. Tunnel dynamic response i...

Tunnels are commonly designed under seismic loading assuming “free field conditions”. However, in urban areas these structures pass beneath buildings, often high-rise ones, or are located close to them. During seismic excitation, above ground structures may cause complex interaction effects with the tunnel, altering its seismic response compared to...

Tunnels are commonly designed under seismic loading assuming “free field conditions”. However, in urban areas these structures pass beneath buildings, often high-rise ones, or are located close to them. During seismic excitation, above ground structures may cause complex interaction effects with the tunnel, altering its seismic response compared to...

A series of dynamic centrifuge tests performed on rectangular tunnel models embedded in dry sand is presented. The tests were carried out at the geotechnical centrifuge facility of IFSTTAR in Nantes within the DRESBUS II Transnational Access Use action offered by the SERIES research project (http://www.series.upatras.gr/DRESBUS_II). Among the innov...