Georgios Tsionis

Georgios Tsionis
European Commission | ec · Joint Research Centre (JRC)

PhD

About

45
Publications
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405
Citations

Publications

Publications (45)
Article
Full-text available
In flat-slab frames, which are typically designed as secondary seismic structures, the shear failure of the slab around the column (punching failure) is typically the governing failure mode which limits the deformation capacity and can potentially lead to a progressive collapse of the structure. Existing rules to predict the capacity of flat slab f...
Article
Full-scale testing of a two-storey flat slab structure is reported, undertaken in the SlabSTRESS research project; the construction and testing were planned and carried out at the ELSA laboratory of the European Commission's Joint Research Centre. The dimensions are three bays by two, spans 4.5 and 5 m, slab thickness 0.2 m, interstorey height 3.2...
Article
Many historical events have shown that, after an earthquake, fire may be triggered by seismic-induced rupture of gas piping, failure of electrical systems, etc. The current engineering design methods still ignores many aspects of multi-hazard and in particular fire following earthquake (FFE) analysis. In this respect, the aim of this paper is to st...
Conference Paper
Full-text available
The SlabSTRESS project investigated the behaviour of a full-scale Reinforced Concrete flat slab building under both gravity loads and seismic lateral actions. The two-storey structure had 9.0 m × 14.5 m plan dimensions, three bays in the loading direction and two orthogonally. This layout enabled to test simultaneously three types of slab-column co...
Book
Full-text available
The European Commission‘s Joint Research Centre (JRC) gives leading researchers from across Europe and beyond access to its world-class facilities and laboratories, enabling state-of-the-art experimental research, collaboration and capacity building with a European dimension. It does so through the programme for open access to JRC research infrastr...
Technical Report
Full-text available
The report summarises the work prepared to date within the scope of the Pilot Project “Integrated techniques for the seismic strengthening and energy efficiency of existing buildings”, and presented during a Joint Research Centre (JRC) homonymous workshop that took place online on 16–19 November 2020. The objective of the midterm workshop was to im...
Conference Paper
Full-text available
Flat slab buildings for commercial, office and residential use are built in many countries. Yet, their behaviour under seismic and gravity actions is still not very well understood. Many studies have been carried out in North America but European research is lagging behind and currently Eurocode 8 does not cover the design of buildings with flat sl...
Conference Paper
Full-text available
The EQUFIRE project aims to study the post-earthquake fire performance of steel frame structures and is part of the Transnational Access activities of the SERA project (www.sera-eu.org) at the ELSA Reaction Wall of the European Commission-Joint Research Centre. As it has happened in many historical occasions, after an earthquake, earthquake-induced...
Technical Report
Full-text available
The work outlines recent EU policies supporting the sustainability and climate resilience of infrastructure and buildings. It evaluates the expected variations in climatic factors causing corrosion, provides a state of the art review on climate change induced corrosion of reinforced concrete and steel structures, and presents recent works on the c...
Conference Paper
Full-text available
The European Commission's Joint Research Centre has developed a number of methods and tools that contribute to better resilience of urban regions. Although the tools originally have not been thought for aspects of crisis management cycle they can make essential part of a resilience tool suite for national authorities, critical infrastructure owners...
Conference Paper
Full-text available
Earthquakes represent a serious threat for several European countries, particularly for Mediterranean bordering countries, where seismic events have been triggering significant destruction and loss over the last decades. Since the early 1970's, when the first studies on seismic vulnerability assessment of buildings at large geographical areas were...
Technical Report
Full-text available
Earthquakes continue to represent a serious threat for some European countries, particularly for Mediterranean bordering countries, where these events have been triggering significant destruction and loss over the last decades. Despite the unpredictable nature of earthquakes, seismic risk assessment should be addressed having in mind the main cause...
Poster
Full-text available
Critical infrastructures are the backbone of modern society and provide many essential goods and services to urban areas. Given the risks associated with the impact of natural hazards on critical infrastructures, the move towards safer and more resilient cities requires the development and application of an improved risk assessment framework to add...
Article
A novel seismic retrofitting method for an RC column is proposed in this paper. In the proposed retrofit method, both ends of an RC column are actively confined with steel plates and pretensioned high-strength external hoops. Then, a steel brace and the RC column are connected together to increase the lateral strength. The effectiveness of the retr...
Article
This Chapter presents a literature review of seismic fragility functions for reinforced concrete road and railway bridges. It first covers the main issues in fragility analysis, such as the systems for classification of bridges, methods for deriving fragility functions, intensity measures, damage states and damage measures. A section is dedicated t...
Technical Report
A literature review on the seismic strengthening of reinforced concrete buildings, using steel bracings, infills and shear walls, is presented. Extensive experimental testing and numerical analyses of elements and structures have demonstrated the feasibility and effectiveness of all three measures for the increase of global strength and stiffness....
Article
The seismic vulnerability of stone masonry buildings is studied on the basis of their fragility curves. In order to account for out-of-plane failure modes, normally disregarded in past studies, linear static Finite Element analysis in 3D of prototype regular buildings is performed using a nonlinear biaxial failure criterion for masonry. More than 1...
Article
Fragility curves are constructed for prototype regular RC frame and wall-frame buildings designed and detailed per EC 2 and EC 8. The aim is to evaluate how the Eurocodes achieve their seismic performance goals for RC buildings designed to them. These goals seem to be met in a consistent and uniform way across all types of buildings considered and...
Article
Nonlinear response-history analyses (NLRHA) are performed for 16 five- or eight-storey prototype regular reinforced concrete wall-frame (“dual”) buildings designed to Eurocode 8 for ductility class (DC) M (Medium) or H (High), in order to evaluate the higher-mode inelastic magnification of shear forces in the walls. The percentage of the total base...
Article
Closed-form solutions are developed for the elastic response of symmetric bridges, continuous over two, three or four spans, for unidirectional earthquake perpendicular to the deck, i.e., in the transverse or the vertical direction. The ends of the deck are restrained along the earthquake component, but free to rotate within the plane of bending. T...
Book
Full-text available
It is an essential step in urban earthquake risk assessment to compile inventory databases of elements at risk and to make a classification on the basis of pre-defined typology/taxonomy definitions. Typology definitions and the classification system should reflect the vulnerability characteristics of the systems at risk, e.g. buildings, lifeline ne...
Article
Fragility curves are constructed for a portfolio of prototype regular RC frame and wall-frame buildings designed and detailed to EC2 and EC8. The aim is to use EC8’s own seismic performance assessment methods and criteria for existing buildings to evaluate how EC8 achieves its performance goals for new RC buildings. The overall conclusion is that t...
Conference Paper
Full-text available
: Fragility curves are developed for stone masonry buildings with rigid or flexible floors and varying number of storeys, plan dimensions, number of interior cross-walls, storey height, percentage of side length of exterior walls taken up by openings and wall height-to-thickness ratio. Linear Finite Element analysis in 3D is performed and a nonline...
Article
Full-text available
The seismic design of multi-storey precast structures is at present not covered by specific provisions of the European seismic codes. To fill such gap, capacity design criteria for multi-storey precast concrete frames with hinged beams are presented. Based on the same approach prescribed by the codes for monolithic cast-in-place frames, a distribut...
Article
The research presented in this article deals with the seismic retrofit of bridge piers with rectangular hollow cross-section using fiber-reinforced polymer (FRP) jackets. A two-level numerical approach that combines finite element method (FEM) analyses and fiber modeling is proposed. The FEM is used to study the effect of FRP jackets on the propert...
Article
Pseudo-dynamic tests on a large-scale model of an existing six-pier bridge were performed at the ELSA laboratory using the substructuring technique. Two physical pier models were constructed and tested in the laboratory, while the deck, the abutments and the remaining four piers were numerically modeled on-line. These tests on a large-scale model o...
Article
Cyclic tests on two large-scale models of existing bridge piers with rectangular hollow cross-section were performed in the ELSA laboratory. The prototype structure is an existing reinforced concrete highway bridge constructed in Austria in 1975. The piers presented several seismic deficiencies and consequently they showed poor hysteretic behaviour...
Article
On 31 October and 1 November 2002, two earthquakes took place in the Italian region of Molise. 29 deaths were reported, while many buildings collapsed or suffered major damage. The tectonics of the earthquakes and historic seismicity of the area are briefly described. The distribution of damage and macroseismic intensity are confronted with the cur...
Article
Full-text available
Within the VAB research program, pseudodynamic tests on a large-scale model of an existing bridge were carried out in the reaction wall of the ELSA laboratory of the Joint Research Centre, applying the substructuring method. Asynchronous input motion, generated for the bridge site, was considered at the base of the piers and abutments. Non-linear s...
Article
Full-text available
This paper presents a simplified method for the capacity design of multi-storey precast concrete frames with hinged beams. A parametric study shows that in the field of ordinary and less flexible structures, the proposed simplified method can be applied with full reliability, in the same way as prescribed by the seismic codes for monolithic cast-in...

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Projects

Projects (6)
Project
The Joint Research Centre is offering transnational access to the ELSA Reaction Wall, within the Horizon Europe project ERIES (Engineering Research Infrastructures for European Synergies). This is a unique opportunity to have your experimental project fully financed. The ERIES project will cover the cost for the construction of the specimens, use of the laboratory, staff and equipment necessary for the experimental project, as well as travel and subsistence of users for preliminary meetings and for attending the tests. Two transnational access projects will be hosted at the ELSA Reaction Wall.
Project
The mission of the Working Group is to help in disseminating technical content of solutions and methods that can both reduce seismic vulnerability and increase energy efficiency, resulting in a significant reduction in environmental impact.
Project
The Joint Research Centre is opening the ELSA Reaction Wall to academia and research organisations, industry and SMEs. We invite cross-boundary proposals for projects to experiment, prototype and demonstrate ideas on the New European Bauhaus. The call for proposals is open until 16 January 2022. You can find more information in the link https://ec.europa.eu/jrc/en/research-facility/open-access/relevance-driven/2021-1-rd-elsa-reactionwall. Priority topics may address, but are not limited to: • safe and green renovation of buildings • nanomaterials in buildings and construction (projects under this topic will use both the ELSA Reaction Wall and the JRC Nanobiotechnology Laboratory) • design and retrofit for resilience • safety of built infrastructure against multiple hazards, including climate change • new materials and technologies • sustainable construction • application of advanced testing methods. Prospective applicants are strongly encouraged to contact JRC-OPEN-ELSA@ec.europa.eu for clarifying matters concerning the technical capabilities of the facility, feasibility, cost, time schedule, etc.