Nicholas Kyriakides

Nicholas Kyriakides
Cyprus University of Technology · Department of Civil Engineering and Geomatics

PhD in Earthquake Risk Assessment

About

84
Publications
31,490
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667
Citations
Citations since 2016
46 Research Items
549 Citations
2016201720182019202020212022020406080100
2016201720182019202020212022020406080100
2016201720182019202020212022020406080100
2016201720182019202020212022020406080100
Additional affiliations
January 2008 - present
Cyprus University of Technology
Position
  • PostDoc Position

Publications

Publications (84)
Conference Paper
Full-text available
Σε αυτή την ερευνητική εργασία μελετήθηκε η απόδοση των τοιχοπληρώσεων ΟΣ για τη σεισμική ενίσχυση υφιστάμενων φορέων ΟΣ σε διάφορα επίπεδα επικινδυνότητας σεισμού (0.25g, 0.2g, 0.15g). Η αποτελεσματικότητα της σεισμικής ενίσχυσης φορέων ΟΣ με τη μετατροπή επιλεγμένων ανοιγμάτων σε νέα τοιχώματα μέσω τοιχοπληρώσεων ΟΣ, μελετήθηκε πειραματικά όπως α...
Conference Paper
Full-text available
The contribution of dowels that connect a new reinforced concrete (RC) infill wall to the surrounding existing RC frame members for the seismic strengthening of existing multi-storey multi-bay RC frame buildings was studied through a numerical parametric study and it presented in this paper. The parametric study was performed by nonlinear response-...
Article
Full-text available
This research investigates the performance of Steel Fiber Reinforced Rubberized Concrete (SFRRC) that incorporates high volumes of End-of-life tire materials, (i.e., both rubber particles and recycled tire steel fibers) in strengthening existing reinforced concrete (RC) beams. The mechanical and durability properties were determined for an environm...
Article
Full-text available
The seismic retrofitting of existing multi-storey multi-bay reinforced concrete (RC) frame buildings by the conversion of selected bays into new RC infilled walls is the subject of this research work. The contribution of dowels that connect a new RC infill wall to the surrounding existing RC frame members was studied through a parametric study. The...
Poster
Full-text available
The EXCELSIOR project (www.excelsior2020.eu) has received funding from the European Union’s Horizon 2020 research and innovation programme under Grant Agreement No 857510 and from the Government of the Republic of Cyprus through the Directorate General for the European Programmes, Coordination and Development. The EXCELSIOR project aims to upgrade...
Chapter
Frame encasement is a common technique for the seismic retrofitting of buildings when a high increase in seismic resistance is needed. It is very effective for the control of global lateral drifts and the reduction of damage to structural and non-structural elements. Frame encasement using shear walls can be provided by casting RC within the existi...
Chapter
Steel jacketing is an effective repair and/or strengthening technique. It can also be used to upgrade buildings when a change of use leads to an increase in loading, as it can assist with the transfer of vertical loads to the foundation. Steel jacket technology is simple, familiar to the construction industry and readily applicable, not only in RC...
Article
Full-text available
Seismic risk assessment for Cyprus at national scale is based on event-based probabilistic seismic risk analysis and eventual selection of seismic scenarios for given return periods. The current study was included in the National Risk Assessment of Cyprus, for 2018, following the European Commission requirements and guidelines. The latter analysis...
Article
Full-text available
Although it is evident that the RC infill wall is an economic and practical way to improve the lateral strength of framed structures and a retrofitting method for existing buildings to withstand earthquake loads, there are still a lot of limitations regarding their application. Codes do not provide any guidance for their design and detailing or spe...
Article
A large part of the existing building stock was not designed according to the current codes in seismic prone regions. The poor performance of some reinforced concrete structures was related to the presence of the masonry infill walls. Although the infill walls can increase the lateral resistance of frames in many cases, it is widely recognized that...
Chapter
Industrial quarry waste build-up is yet another environmental issue and health threat. The danger could be reduced significantly or even resolved by inclusion of quarry waste in concrete and cementitious materials. Not only a waste accumulation problem can be solved, but at the same time concrete and mortar mixtures become more sustainable by incor...
Chapter
Full-text available
The objective of this paper is to introduce CyCLOPS, a novel strategic research infrastructure unit, and present its current progress of implementation, and integration in the National geodetic, geophysical and geotechnical infrastructure of the government-controlled areas of the Republic of Cyprus. CyCLOPS is co-funded by the European Regional Dev...
Article
Full-text available
Fabric reinforced cementitious matrix (FRCM) composites, also known as textile reinforced mortars (TRM), an inorganic matrix constituting fibre fabrics and cement-based mortar, are becoming a widely used composite material in Europe for upgrading the seismic resistance of existing reinforced concrete (RC) frame buildings. One way of providing seism...
Conference Paper
This paper aims to expand today’s knowledge regarding the use of TRM, which is a combination of inorganic matrix (lime- or cement-based) and non-corrosive multi-axial textile fabrics, for retrofitting masonry-infilled RC frames. Firstly, a 2D simple FE micro-model of a three-story masonry-infilled RC frame with TRM is developed and validated using...
Chapter
Full-text available
This paper presents how the EXSELSIOR H2020 Teaming project will support the management and monitoring of the cultural heritage domain through its research and innovation agenda within the Eastern Mediterranean, Middle East, and North Africa (region known as EMMENA). The pressing need for protecting the cultural heritage assets is highlighted throu...
Conference Paper
p>Concrete is one of the most commonly used construction materials. However, the main drawbacks in the use of concrete are related to the use of cement and subsequently the high percentage of carbon dioxide emissions. The use of cement substitutes is an area where there is a lot of ongoing research. Geopolymer concrete is a concrete in which cement...
Article
Full-text available
Past lateral cyclic or seismic tests of concrete frames with smooth bars in columns are very few and limited as far as the test structure’s size and geometry are concerned; moreover, they have not focused on the effect of detailing and lap-splicing of such bars on local and global behaviour. To help fill this knowledge gap with new data, the paper...
Conference Paper
Full-text available
This paper presents the significance and importance of promoting the benefits of Earth Observation when implemented in ‘secondary’ and ‘higher education’ in Cyprus schools. Firstly, examples of how Earth observation is used in other countries for the secondary education such as Germany and China and how ESA through Earth Observation education mater...
Conference Paper
Full-text available
The behavior of masonry-infilled reinforced concrete (RC) frame structures during an earthquake has attracted the attention by structural engineers since the 1950's. During the last decade, the use of Textile Reinforced Mortar (TRM) as retrofitting material for masonry-infilled RC frames under in-plane lateral loadings has been studied. This paper...
Conference Paper
Full-text available
The seismic retrofitting of exist ing multi-storey multi-bay RC frame buildin gs by the conversion of selected bays into new RC infilled walls is presented in this paper. This ret rofitting method was studied experimentally with in the SERFIN p roject through a series of experiments, wh ich took place at the European Labora tory of Structural Asses...
Article
This research is focused on improving the mechanical response of rubberised concrete, with the objective of enhancing its weak Interfacial Transition Zone (ITZ). Pre-treatment of recycled tyre rubber particles by another material that is otherwise considered as waste, Waste Quarry Dust (WQD), diminished the hydrophobicity of rubber and subsequently...
Article
Full-text available
A numerical study was conducted to investigate the in-plane behavior of a masonry-infilled reinforced concrete (RC) frame retrofitted with textile-reinforced mortar (TRM). A two-dimensional finite element model was developed using DIANA finite element analysis (FEA) software to simulate the 2 : 3 scaled three-storey masonry-infilled RC frame retrof...
Conference Paper
Full-text available
The effectiveness of seismic retrofitting of RC-frame buildings by converting selected bays into new walls through infilling with RC walls was studied experimentally using a full-scale four-storey model tested with the pseudo-dynamic (PsD) method. The frames were designed and detailed for gravity loads only. Different connection details between the...
Conference Paper
Full-text available
This paper presents a numerical study of the behavior of existing masonry-infilled reinforced concrete (RC) frame that was studied experimentally at the University of Patra (Greece) for a PhD study. It is a 2:3 scale three-storey structure with non-seismic design and detailing, subjected to in-plane cyclic loading. Two infilled frames were designed...
Article
Full-text available
Background The behavior of masonry-infilled Reinforced Concrete (RC) frame structures during an earthquake, has attracted the attention of structural engineers since the 1950s. Experimental and numerical studies have been carried out to investigate the behavior of masonry-infilled RC frame under in-plane loading. Objective This paper presents a nu...
Conference Paper
Full-text available
The parametric study of the contribution of dowels that connect a new reinforced concrete (RC) infill wall to the surrounding RC frame members was performed through nonlinear dynamic analyses of a numerical finite element (FE) model. The FE model was simulated in DIANA fi-nite element analysis (FEA) software in order to study the effectiveness of t...
Conference Paper
Re-use of End-of-life tyre components into concrete is a viable solution to the environmental issue of tyre waste that can result in promising, high added value concrete applications. End-of-life tyre particles are added to conventional concrete by replacement of a percentage of its aggregate content, improving concrete deformability. The material...
Conference Paper
One of the top ten goals by the European Union’s White Paper on Transport is to reduce road fatalities. With the most vulnerable road users, motorcyclists, suffering frequent fatalities in crashes involving road barriers, the European Road Assessment has indicated the critical need to adopt improved barrier designs. While both steel guardrail and c...
Conference Paper
Full-text available
An experimental campaign that studied the effectiveness of seismic retrofitting of existing structures was simulated and analyzed in DIANA finite element analysis (FEA) software. The retrofitting method that was studied is the conversion of selected bays into new infilled RC walls for the retrofitting of a multi-storey multi-bay RC frame building....
Article
Full-text available
Background:Reinforced Concrete (RC) buildings with no seismic design exhibit degrading behaviour under severe seismic loading due to non-ductile brittle failure modes. The seismic performance of such substandard structures can be predicted using existing capacity demand diagram methods through the idealization of the non-linear capacity curve of th...
Article
Full-text available
Defining the collapse probability of existing nonseismically designed RC buildings is a challenge mainly due to the fact that its determination relies on the simulation of the brittle failure modes controlling the collapse mechanism. Routine nonlinear dynamic analysis of ductile RC frames is not applicable for such buildings, which often fail prior...
Chapter
The scope of this work is to present an integrated methodological multi-scale and multi-temporal approach for the study of ancient monuments in their environmental context. The presented work showcases the interdisciplinary research experience gained during the last years by the Remote Sensing and Geo-Environment Lab (ERATOSTHENES Research Centre)...
Article
Full-text available
Cyprus and the Eastern Mediterranean region are hosts to a unique Cultural Heritage (CH) wealth, whose valorization and contribution to sustainable development calls for concentrated efforts with regards to CH documentation, scientific study, monitoring, protection, and promotion. Most traditional practices addressing the aforementioned requirement...
Article
Full-text available
This article examines the effectiveness of two innovative retrofitting solutions at enhancing the seismic behaviour of a substandard reinforced concrete building tested on a shake table as part of the Pan-European funded project BANDIT. To simulate typical substandard construction, the reinforcement of columns and beam-column joints of the full-sca...
Conference Paper
Full-text available
The main steps of the seismic risk assessment as essential tool of the risk management process are presented, highlighting the need of its standardization for the development of emergency plans by the civil protection authorities. Some of the available seismic risk assessment methods and outcomes are illustrated and demonstrated through a seismic s...
Article
Full-text available
The fragility curves are an essential tool in the seismic assessment of structures and provides a versatile tool to conduct vulnerability analysis for retrofitting and strengthening purposes. The available advancements of computer computational power led to improving the efficiency of the analytical fragility curves. Therefore, paper focuses on rev...
Article
Severe and repeated earthquakes devastated Cyprus in antiquity, causing in many cases the abandonment of entire settlement sites. Yet, information regarding the level of seismic activity of historical seismicity in Cyprus is very limited and does not provide the evidence to arrive at reliable conclusions relative to hazard damage parameters such as...
Article
Full-text available
The effectiveness of seismic retrofitting of RC-frame buildings by converting selected bays into new walls through infilling with RC walls was studied experimentally using a full-scale four-storey model tested with the pseudo-dynamic (PsD) method. The frames were designed and detailed for gravity loads only using different connection details betwee...
Article
Full-text available
An analytical seismic fragility assessment framework is presented for the existing low strength reinforced concrete structures more common in the building stock of the developing countries. For realistic modelling of such substandard structures, low strength concrete stress-strain and bond-slip capacity models are included in calibrating material m...
Article
Full-text available
Chapter
Cultural heritage artifacts and buildings are under a constant thread of destruction during devastating earthquakes. Any intervention should be such that it neither violates their form nor changes drastically their structural behavior and should be reversible. In addition, the materials to be used must be compatible with the ones the monument is co...
Article
Full-text available
The quantification of the devastating effects of earthquakes on buildings can be achieved with the use of earthquake risk assessment. The formulation of strategies to minimise this risk is a complex task which relies on data regarding mainly the hazard, vulnerability and remaining life of the building. In this paper, the case study of Limassol muni...
Article
Full-text available
The majority of structures in seismic-prone areas worldwide are structures that have been designed either without seismic design considerations, or using codes of practice that are seriously inadequate in the light of current seismic design principles. In Cyprus, after a series of earthquakes that occurred between 1995 and 1999, it was decided to c...
Chapter
The protection of monuments from aging and natural hazards, such as earthquakes, is very important since such structures are part of the cultural heritage of many countries around the world. In order to protect them from earthquakes, their structural system has to be identified and their capacity to withstand dynamic loads has to be clearly underst...
Conference Paper
The aims of the bridge management authorities are to ensure that bridges fulfil their purpose and functionality during their design life. So, it is important to identify and quantify the deterioration of the structural condition early so that a timely application of an intervention will avoid more serious problems and increased costs at a later sta...
Article
Full-text available
This paper presents a framework for analytical seismic vulnerability assessment of substandard reinforced concrete (RC) structures in developing countries. A modified capacity-demand diagram method is used to predict the response of RC structures with degrading behaviour. A damage index based on period change is used to quantify the evolution of da...
Article
Full-text available
Masonry structures are complex systems that require a thorough and detailed knowledge and information regarding their behavior under seismic loading. Appropriate modeling of a masonry structure is a prerequisite for a reliable earthquake resistant design or assessment. However, modeling a real structure to a robust quantitative (mathematical) repre...