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  1. Agathoklis Giaralis
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portrait of Dr Agathoklis Giaralis

Dr Agathoklis Giaralis

Senior Lecturer in Structural Engineering

School of Mathematics, Computer Science & Engineering, Civil Engineering

Contact Information

Contact

Visit Agathoklis Giaralis

C174, Tait Building

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Postal Address

City, University of London
Northampton Square
London
EC1V 0HB
United Kingdom

About

Background

Dr Agathoklis Giaralis graduated with a 5-year Diploma in Structural Engineering from the Department of Civil Engineering of Aristotle University of Thessaloniki-Greece in July, 2003. He subsequently received from the same Department an MSc in Earthquake Resistant Design of Structures in August, 2004. In the same year, he enrolled in the Department of Civil and Environmental Engineering of Rice University, Houston, TX-USA, to pursue PhD studies partly funded by a Fulbright Exchange Student Program. He graduated with a PhD in Civil Engineering from Rice University in May 2008 and then served for a year as a lecturer at the Department of Civil and Environmental Engineering and as a post-doctoral fellow at the Department of Mechanical Engineering and Materials Science at Rice University. In September 2009, he joined the School of Engineering and Mathematical Sciences at City University London. As of August 2012, he serves as a Senior Lecturer in Structural Engineering in the Department of Civil Engineering at City University London.

Dr Giaralis is leading the Structural Dynamics Research Group within the Department of Civil Engineering at City University London focusing on nonlinear stochastic dynamics approaches and on time-frequency signal analysis techniques for eathquake engineering, seismic structural design and assessment, structural health monitoring, and passive vibration control applications.
In terms of teaching duties, he is lecturing on Structural Dynamics, on Earthquake Engineering, and on Classical and Matrix methods in Structural Analysis modules at undergraduate and post-graduate levels. As of February 2010, he also serves as the Course Director of the MSc Construction Management run by the School of Engineering and Mathematical Sciences in collaboration with the Cass business School of City University London.

Qualifications

-PhD Civil & Environmental Engineering, Rice University, Houston, TX, USA, 2008
-MSc in Seismic Design of Structures, Aristotle University of Thessaloniki, Greece, 2004
-Ptychion (5 yr Greek Diploma) Civil/Structural Engineering, Aristotle University of Thessaloniki, Greece, 2003

Employment

08/2012 - to date City University London, Senior Lecturer in Structural Engineering
09/2009 - 07/2012 City University London, Lecturer in Structural Engineering
08/2008 - 12/2008 Rice University, Lecturer
05/2008 - 08/2009 Rice University, Postdoctoral Fellow
08/2004 - 05/2008 Rice University, Research Associate

Research

Research interests

-Non-linear Stochastic Dynamics
-Signal analysis techniques in structural dynamics and health monitoring
-Earthquake Engineering
-Passive structural vibration control

Research expertise

-Stochastic representation and simulation of dynamic loads in wind, wave, and earthquake engineering;
-Time-frequency signal analysis techniques in structural dynamics and health monitoring/damage detection applications;
-Stochastic dynamics approaches for seismic design and assessment of nonlinear structural systems;
-Passive structural vibration control solutions and optimum design;
-Performance-Based Seismic design and assessment of civil infrastructure accounting for input and system uncertainty

Research Students

Name
Kyriaki Gkoktsi
Thesis Title
Compressive sensing acquisition and processing techniques for vibration-based structural health monitoring applications
Further Information
PhD Full-time student; Funded by a University studentship; Expected submission: 2017
Name
Alessandro Margnelli
Thesis Title
Wavelet-based signal analysis and structural damage detection techniques to inform performance-based earthquake engineering
Further Information
Part-time external PhD student; Employee: AKT-II; Expected submission: 2018
Name
Paschalis Skrekas
Thesis Title
Treatment of input and system uncertainty for seismic structural assessment scenarios: fixed-based offshore platforms and collisions of adjacent buildings
Further Information
PhD Full-time student; Funded by a University studentship; Expected submission: 2016
Name
Laurentiu Marian
Thesis Title
Optimal design and assessment of tuned-mass-damper-interter systems for passive vibration control of civil engineering structures
Further Information
PhD Full-time student; Funded by a University studentship; Expected submission: 2015
Name
Anca Lungu
Thesis Title
Time-frequency characterisation and stochastic modelling of pulse-like near fault seismic strong ground motion
Further Information
PhD Full-time student; Funded by School's QR funding; Expected submission: 2014

Publications

Conference Papers and Proceedings (29)

  1. Gkoktsi, K. and Giaralis, A. (2016). Assessment of sub-Nyquist deterministic and random data sampling techniques for operational modal analysis. .
  2. Giaralis, A. and Marian, L. (2016). Use of inerter devices for weight reduction of tuned mass-dampers for seismic protection of multi-storey buildings: The tuned mass-damperinterter (TMDI). .
  3. Gkoktsi, K., Giaralis, A. and Tausiesakul, B. (2016). Sub-Nyquist signal-reconstruction-free operational modal analysis and damage detection in the presence of noise. .
  4. Giaralis, A. and Taflanidis, A.A. (2015). Reliability-based design of tuned mass-damper-inerter (TMDI) equipped multi-storey frame buildings under seismic excitation. .
  5. Giaralis, A. and Kougioumtzoglou, I.A. (2015). A stochastic dynamics approach for response spectrum analysis of bilinear systems using time-dependent equivalent linear properties. .
  6. Gkoktsi, K., Tausiesakul, B. and Giaralis, A. (2015). Multi-channel sub-Nyquist cross-spectral estimation for modal analysis of vibrating structures. .
  7. Gkoktsi, K. and Giaralis, A. (2014). On the influence of frequency selectivity of wavelet bases for relative wavelet entropy-based structural damage localization. 6th World Conference on Structural Control and Monitoring 15-17 July, Barcelona, Spain.
  8. TauSiesakul, B., Gkoktsi, K. and Giaralis, A. (2014). COMPRESSIVE SENSING SPECTRAL ESTIMATION FOR OUTPUT-ONLY STRUCTURAL SYSTEM IDENTIFICATION. Seventh International Conference on Computational Stochastic Mechanics 15-18 June, Santorini, Greece.
  9. Giaralis, A. and Vamvatsikos, D. (2014). Local Wavelet-Based Spectral "epsilon" Modification of Ground Motions in Support of Incremental Dynamic Analysis. .
  10. Skrekas, P. and Giaralis, A. (2013). Influence of near-fault effects and of incident angle of earthquake waves on the seismic inelastic demands of a typical Jack-Up platform. 14th International Conference: The Jack-Up Platform Design, Construction & Operation 17-18 September, London.
  11. Marian, L. and Giaralis, A. (2013). Stochastic response of seismically excited structures equipped with two-terminal flywheel devices for passive vibration control. 11th International Conference on Structural Safety and Reliability for Integrating Structural Analysis, Risk and Reliability 16-20 June, New York, USA.
  12. Lungu, A. and Giaralis, A. (2013). A non-separable stochastic model for pulse-like ground motions. 11th International Conference on Structural Safety and Reliability for Integrating Structural Analysis, Risk and Reliability 16-20 June, New York.
  13. Giaralis, A. and Spanos, P.D. (2013). Derivation of equivalent linear properties of Bouc-Wen hysteretic systems for seismic response spectrum analysis via statistical linearization. 10th HSTAM International Congress on Mechanics 25-27 May, Chania, Greece.
  14. Marian, L. and Giaralis, A. (2013). Optimal design of inerter devices combined with TMDs for vibration control of buildings exposed to stochastic seismic excitations. .
  15. Giaralis, A. and Lungu, A. (2012). ASSESSMENT OF WAVELET-BASED REPRESENTATION TECHNIQUES FOR THE CHARACTERIZATION OF STOCHASTIC PROCESSES MODELLING PULSE-LIKE STRONG GROUND MOTIONS. 6th International ASRANet Conference 2-4 July, Croydon, London, UK.
  16. Skrekas, P. and Giaralis, A. (2012). ON THE USE OF INCREMENTAL DYNAMIC ANALYSIS FOR EVALUATING THE EARTHQUAKE-RESISTANT PERFORMANCE OF OFF-SHORE JACK-UP PLATFORMS. 6th International ASRANet Conference 2-4 July, Croydon, London, UK.
  17. Tsavdaridis KD, and Giaralis, A. (2011). Derivation of dynamic properties of steel perforated Ultra Shallow Floor Beams (USFBTD) via Finite Element modal analysis and experimental verification. 7th National Conference on Steel Structures 28-30 September, Volos, Greece.
  18. Giaralis, A. and Spanos PD., (2011). A response spectrum based stochastic approach to estimate the peak response of structures subject to seismic pounding. 11th International Conference on Applications of Statistics and Probability in Civil Engineering (ICASP11) 1-4 August, Zurich, Switzerland.
  19. Giaralis, A., Kougioumtzoglou I, and Spanos PD, (2011). A stochastic approach for deriving effective linear properties of bilinear hysteretic systems subject to design spectrum compatible strong ground motions. 8th International Conference on Structural Dynamics (EURODYN 2011) 4-6 July, Leuven, Belgium.
  20. Giaralis, A. and Spanos PD., (2010). Derivation of Eurocode 8 spectrum-compatible time-histories from recorded seismic accelerograms via harmonic wavelets. 9th HSTAM International Congress on Mechanics (9HSTAM) 12-14 July, Limassol, Cyprus.
  21. Giaralis, A. and Spanos PD., (2011). Determination of non-stationary stochastic processes compatible with seismic response/design spectra. 6th International Conference on Computational Stochastic Mechanics (CSM-6) 13 Jun 2010 – 16 Jun 2010, Rhodes, Greece.
  22. Giaralis, A. and Spanos PD., (2009). Determination of design spectrum compatible evolutionary spectra via Monte Carlo peak factor estimation. 7th International Probabilistic Workshop (7th IPW) 25-26 November, Delft, The Netherlands.
  23. Giaralis, A. and Spanos PD, (2008). Synthesis of Eurocode compatible seismic accelerograms via wavelets. 2008 Seismic Engineering International Conference commemorating the 1908 Messina and Reggio Calabria Earthquake (MERCEA’08) 8-11 July, Reggio Calabria, Italy.
  24. Spanos, P.D. and Giaralis, A. (2008). Statistical linearization based estimation of the peak response of nonlinear systems subject to the EC8 design spectrum. 2008 SEISMIC ENGINEERING CONFERENCE COMMEMORATING THE 1908 MESSINA AND REGGIO CALABRIA EARTHQUAKE (MERCEA'08) 8-11 July, Reggio Calabria.
  25. Giaralis, A. and Spanos PD, (2008). Wavelets and other emerging techniques for wind engineering applications. 10th National conference of wind engineering (IN-V ENTO) 9-11 June, Palermo, Italy.
  26. Spanos, P.D., Giaralis, A. and Politis, N.P. (2007). Algorithmic options for joint time-frequency analysis in structural dynamics applications. 8th HSTAM International Congress on Mechanics 12-14 July, Patras, Greece.
  27. Giaralis, A. and Spanos PD., (2007). Synthesis of Eurocode-8 design spectrum compatible accelerograms via wavelets. International Symposium on Recent Advances in Mechanics, Dynamical Systems and Probability Theory (MDP2007) 3-6 July, Palermo, Italy.
  28. Giaralis, A. and Spanos PD, (2007). A stochastic approach to synthesizing response spectrum compatible seismic accelerograms. 4th International Conference on Earthquake Geotechnical Engineering (4ICEGE) 25-28 June, Thessaloniki, Greece.
  29. Politis, N.P., Giaralis, A. and Spanos, P.D. (2007). Joint time-frequency representation of simulated earthquake accelerograms via the adaptive chirplet transform. 5th International Conference on Computational Stochastic Mechanics (CSM-5) 21 Jun 2006 – 23 Jun 2006, Rhodes, Greece.

Journal Articles (13)

  1. Salvi, J. and Giaralis, A. (2016). Concept study of a novel energy harvesting-enabled tuned mass-damper-inerter (EH-TMDI) device for vibration control of harmonically-excited structures. Journal of Physics: Conference Series, 744(1) . doi:10.1088/1742-6596/744/1/012082.
  2. Marian, L. and Giaralis, A. (2015). Optimal design of a novel tuned mass-damper-inerter (TMDI) passive vibration control configuration for stochastically support-excited structural systems. Probabilistic Engineering Mechanics, 38, pp. 156–164. doi:10.1016/j.probengmech.2014.03.007.
  3. Gkoktsi, K. and Giaralis, A. (2015). Effect of frequency domain attributes of wavelet analysis filter banks for structural damage localisation using the relative wavelet entropy index. International Journal of Sustainable Materials and Structural Systems, 2(1/2), pp. 134–134. doi:10.1504/IJSMSS.2015.078365.
  4. Tau Siesakul, B., Gkoktsi, K. and Giaralis, A. (2015). Compressive power spectrum sensing for vibration-based output-only system identification of structural systems in the presence of noise. Proceedings of SPIE - The International Society for Optical Engineering, 9484 . doi:10.1117/12.2177162.
  5. Skrekas, P., Sextos, A. and Giaralis, A. (2014). Influence of bi-directional seismic pounding on the inelastic demand distribution of three adjacent multi-storey R/C buildings. Earthquake and Structures, 6(1), pp. 71–87. doi:10.12989/eas.2014.6.1.071.
  6. Spanos, P.D. and Giaralis, A. (2013). Third-order statistical linearization-based approach to derive equivalent linear properties of bilinear hysteretic systems for seismic response spectrum analysis. Structural Safety, 44, pp. 59–69. doi:10.1016/j.strusafe.2012.12.001.
  7. Giaralis, A. and Spanos, P.D. (2012). Derivation of response spectrum compatible non-stationary stochastic processes relying on Monte Carlo-based peak factor estimation. Earthquakes and Structures, 3(3-4), pp. 581–609.

    [publisher’s website]

  8. Giaralis, A. and Spanos, P.D. (2010). Effective linear damping and stiffness coefficients of nonlinear systems for design spectrum based analysis. SOIL DYN EARTHQ ENG, 30(9), pp. 798–810. doi:10.1016/j.soildyn.2010.01.012.
  9. Spanos, P.D., Giaralis, A. and Jie, L. (2009). Synthesis of accelerograms compatible with the Chinese GB 50011-2001 design spectrum via harmonic wavelets: artificial and historic records. EARTHQ ENG ENG VIB, 8(2), pp. 189–206. doi:10.1007/s11803-009-9017-4.
  10. Giaralis, A. and Spanos, P.D. (2009). Wavelet-based response spectrum compatible synthesis of accelerograms-Eurocode application (EC8). SOIL DYN EARTHQ ENG, 29(1), pp. 219–235. doi:10.1016/j.soildyn.2007.12.002.
  11. Spanos, P.D., Giaralis, A. and Politis, N.P. (2007). Time-frequency representation of earthquake accelerograms and inelastic structural response records using the adaptive chirplet decomposition and empirical mode decomposition. SOIL DYN EARTHQ ENG, 27(7), pp. 675–689. doi:10.1016/j.soildyn.2006.11.007.
  12. Spanos, P.D., Giaralis, A., Politis, N.P. and Roesset, J.M. (2007). Numerical treatment of seismic accelerograms and of inelastic seismic structural responses using harmonic wavelets. COMPUTER-AIDED CIVIL AND INFRASTRUCTURE ENGINEERING, 22(4), pp. 254–264.
  13. Giaralis, A. and Petrini, F. Wind-induced vibration mitigation in tall buildings using the tuned mass-damper-inerter (TMDI). Journal of Structural Engineering .

Other Activities

Editorial Activity

  1. Section editor on "Retrofitting & Strengthening"
    within the
    Encyclopaedia of Earthquake Engineering, edited by Michael Beer, et al. and published by Springer.
    .

Events/Conferences (2)

  1. Advances in data acquisition and processing techniques for health monitoring of civil infrastructure. Barcelona, Spain (2014).
    Description: Special Session 08: "Advances in data acquisition and processing techniques for health monitoring of civil infrastructure"
    within the
    6th World Conference on Structural Control and Monitoring
    http://www.6wcscm.es/
    organisers:

    Dr Agathoklis Giaralis (City University London, UK)

    Prof Satish Nagarajaiah (Rice University, USA)
  2. Simulation-based structural vulnerability assessment and risk quantification in earthquake engineering. Liverpool, UK (2014).
    Description: Mini-Symposium 3: “Simulation-based structural vulnerability assessment and
    risk quantification in earthquake engineering”

    within the

    ASCE-ICVRAM-ISUMA 2014 conference
    July 13-16, 2014, Liverpool, UK
    http://www.icvram2014.org/

    organised by Agathoklis Giaralis, Alexandros Taflanidis, and Dimitrios Vamvatsikos

Keynote Lectures/Speeches (5)

  1. Synthesis of Eurocode-8 design spectrum compatible accelerograms via wavelets. Palermo, Italy (2007). Giaralis A and Spanos PD. (2007). Synthesis of Eurocode-8 design spectrum compatible accelerograms via wavelets. In: International Symposium on Recent Advances in Mechanics, Dynamical Systems and Probability Theory (MDP2007, June 3-6, 2007, Palermo, Italy).
  2. Wavelets and other emerging techniques for wind engineering applications. Palermo, Italy (2008). Spanos PD and Giaralis A. (2008). Wavelets and other emerging techniques for wind engineering applications. In: 10th National conference of wind engineering (IN-V ENTO, June 9-11, 2008, Palermo, Italy).
  3. Synthesis of Eurocode compatible seismic accelerograms via wavelets. Reggio Calabria, Italy (2008). Spanos PD and Giaralis A. (2008). Synthesis of Eurocode compatible seismic accelerograms via wavelets. In: 2008 Seismic Engineering International Conference commemorating the 1908 Messina and Reggio Calabria Earthquake (MERCEA’08, July 8-11,2008, Reggio Calabria, Italy).
  4. Advances in seismic response spectrum compatible stochastic representations and in non-linear stochastic structural dynamics techniques for earthquake engineering applications. Thessaloniki, Greece (2013). Invited 6th Annual Seminar (2012-2013) as part of the "MSc in Seismic Design of Structures" offered by the Department of Civil Engineering, Aristostle University of Thessaloniki. (http://aste.civil.auth.gr/index.php?option=com_content&view=article&id=106&Itemid=91&lang=el)
  5. Stochastic representation of earthquake ground motion and applications in seismic design, analysis, and assessment of civil engineering structures. Liverpool, UK (2013). Invited presentation within a US-UK "Workshop on Risk and Uncertainty" organised by the Institute of Risk and Uncertainty, University of Liverpool, 6-8 Novermber 2013.

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London EC1V 0HB

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