Manolis Chatzis Associate Professor of Engineering Science

Professor

Manolis Chatzis

Associate Professor of Engineering Science

  • Biography
  • Research
  • Publications

Biography

Professor Manolis Chatzis graduated from the National Technical University of Athens in 2007 with a Diploma in Civil Engineering and obtained an MSc from NTUA in Structural Engineering in 2008. He then joined Columbia University in the City of New York, where he completed his PhD in the Department of Civil Engineering and Engineering Mechanics in 2012, under the supervision of Professor Andrew Smyth, successfully defending his thesis “The Dynamics of Rigid Bodies on Moving Deformable Media”.

Manolis continued in Columbia as a Post Doctoral Research Scientist working on “System Identification and data fusion”. He was appointed an Associate Professor in the Department of Engineering Science and a Tutorial Fellow at Hertford in 2013.

Research Interests

Manolis' work is focused on the study of Dynamic Systems that exhibit Non-Linearities. Within that framework, the directions of modelling, testing, identifying and mitigating the response of such systems are of interest. Current areas of research include:

Structural Health Monitoring and Vibration Monitoring

Structural Health Monitoring aims at inferring the properties of a system, and detecting the presence of damage, by placing sensors and measuring some of its dynamic responses. To decide on the sensors to be used in an experimental campaign, the study of the observability properties of a system are of paramount importance. Equally, important is the robustness of the System Identification algorithms used to extract the properties and unmeasured responses/excitations from the measured dynamic signals. My group’s work focuses on extending and improving observability and identification algorithms. Examples of applications of interest to infrastructure elements comprise the monitoring of bridges, wind turbines and buildings. An adjoint direction of interest is that of vibration monitoring for museum exhibits.

Modeling Non-Linear Dynamic Systems

We focus on modelling the response of systems with contact and frictional interfaces, and elements containing damage subjected to dynamic excitations. A significant focus within this direction is to accurately model and quantify the risk for rocking components. Both structural systems, e.g. a bridge on a bearing joint, and non-structural, such as museum exhibits are of interest This direction further deals with estimating the risk of systems and proposing suggestions to mitigate it. Various sources of dynamic excitations are considered, such as earthquake excitations, wind and traffic loads, as well as human-induced vibrations.

The previous modelling directions are validated and tested using monitored data from field applications and also generating data in the lab. The group has an interest in design experiments that involve the hydraulic actuators and electric biaxial shake table of the Structural Dynamics Lab. A recent direction of interest is that of developing efficient algorithms and frameworks for the Real-Time Hybrid Testing and Identification of components.

Publications

Journal articles

M.N. Chatzis, M. Garcia Espinosa, C. Needham, M.S. Williams “Examining the energy loss in systems of stacked rocking bodies”, Journal of Engineering Mechanics, 2018, 10.1061/(ASCE)EM.1943-7889.0001443

M.N. Chatzis, E.N. Chatzi, ‘A Discontinuous Unscented Kalman Filter for Non-Smooth Dynamic Problems’, Frontiers in Built Environment, 2017, 10.3389/fbuil.2017.00056

M.N. Chatzis, E.N. Chatzi, S.P. Triantafyllou ‘A Discontinuous Extended Kalman Filter for Non-Smooth Dynamic Problems’, Mechanical Systems and Signal Processing, http://dx.doi.org/10.1016/j.ymssp.2017.01.021, (Oxford Ora open access: https://ora.ox.ac.uk/objects/uuid:f9989797-87e7-4302-94ab-c9cdc94015e7)

M.N. Chatzis, M. Garcia Espinosa, A.W. Smyth, ‘Examining the energy loss in the Inverted Pendulum Model for rocking bodies’, Journal of Engineering Mechanics, 2016, http://ascelibrary.org/doi/abs/10.1061/(ASCE)EM.1943-7889.0001205, (Oxford Ora open access: https://ora.ox.ac.uk:443/objects/uuid:78679ef3-d6e3-47fe-b9ce-b5fe3428bdf2)

A.W. Smyth, P. Brewick, R.Y. Greenbaum, M.N. Chatzis, A. Serotta and I. Stunkel, ‘Vibration Mitigation And Monitoring: A Case Study Of Construction In A Museum’, Journal of the American Institute for Conservation, 55:1,32-55,2016

R.Y. Greenbaum, A.W. Smyth, M. N. Chatzis, ‘Monocular Computer Vision Method for the Experimental Study of Three Dimensional Rocking Motion’, Journal of Engineering Mechanics, 10.1061/(ASCE)EM.1943-7889.0000972

M.N. Chatzis, E.N. Chatzi, and A.W. Smyth (2014), ‘An experimental validation of time domain system identification methods with fusion of heterogeneous data’, Earthquake Engng Struct. Dyn., doi:10.1002/eqe.2528

M.N. Chatzis, E.N. Chatzi and A.W. Smyth ‘On the observability and identifiability of nonlinear structural and mechanical systems’, Journal of Structural Control and Health Monitoring,DOI: 10.1002/stc.1690

M.N. Chatzis and G. Deodatis ‘Modeling of very large interacting multiple-beam systems with an application to suspension bridge cables’, Journal of Structural Engineering, 139(9), 1541–1554, 2013

M.N. Chatzis and A.W. Smyth ‘Three-Dimensional Dynamics of a Rigid Body with Wheels on a Moving Base’, Journal of Engineering Mechanics, Volume 139, Issue 4, April 2013, Pages 496-511, DOI: 10.1061/(ASCE)EM.1943-7889.0000456.

M.N. Chatzis and A.W. Smyth ‘Modeling of the 3D Rocking Problem’, Journal of Non-Linear Mechanics, Volume 47, Issue 4, May 2012, Pages 85-98

M.N. Chatzis and A.W. Smyth ‘Robust Modeling of the Rocking Problem’, Journal of Engineering Mechanics, Volume 138, Issue 3, 2012

Conference proceedings

X. Shi, M.N. Chatzis, S.P. Triantafyllou and M. S. Williams, ‘Observability and Identification of Damage-Healing Hysteretic Model’, Proceedings of 7WCSCM, 2018, Qingdao, China (accepted to be published after conference)

X. Shi, M.N. Chatzis and M.S. Williams, ‘Robust computation of the observability of large linear systems with unknown parameters’, Proceedings of IALCCE 2018

E. Kakouris, M.N. Chatzis and S.P. Triantafyllou, ‘A Material Point Method for Studying Rocking Systems’, Proceedings of 16th ECEE, June 2018, Thessaloniki, Greece

M.N. Chatzis, E.N. Chatzi, ‘Online Bayesian Identification of Non-Smooth Systems’, Proceedings of Eurodyn 2017, September 2017, La Sapienza, Rome

M.N. Chatzis, E.N. Chatzi, ‘A Discontinuous ”D” Variant for Identification of non-smooth systems’, Proceedings of ICOSSAR 2017, TU Wien, Vienna Austria

M. Garcia Espinosa, M.N. Chatzis ‘A preliminary investigation of methods for generating fragility curves for rocking bodies’, Proceedings of the 16th WCEE, Chile 2017

M.N. Chatzis, E.N. Chatzi, S. P. Triantafyllou ‘A discontinuous class of filtering methods for the identification of non-smooth dynamical systems’, Proceedings of IALCCE 2016, October 2016, Delft, The Netherlands

S.P. Triantafyllou, M.N. Chatzis, ‘A new damage-healing smooth hysteretic formulation for the modeling of self-healing materials’, Proceedings of the 8th GRACM International Congress on Computational Mechanics, Volos, 12 July – 15 July 2015

M.N. Chatzis, E.N. Chatzi and A.W. Smyth ‘Identification of an Experimental Structure using Heterogeneous Observable Sensor Setups’, Proceedings Sixth World Conference of Structural Control and Monitoring, July 15-17 2014, Edificio Vèrtex, Universitat Politècnica de Catalunya, Barcelona Spain

M.N. Chatzis, E.N. Chatzi and A.W. Smyth ‘Observability and Identifiability methods for Structural Dynamic Systems’, Proceedings Second International Conference On Vulnerability And Risk Analysis And Management (ICVRAM) And The Sixth International Symposium On Undertainty Modeling And Analysis (ISUMA), July 13-16, 2014, Liverpool, United Kingdom

M.N. Chatzis and A.W. Smyth ‘Preliminary investigation of the randomness in the outcome of a die throw’, Proceedings ICOSSAR 2013 11th International Conference on Structural Safety and Reliability, June 16-20, 2013, Columbia University, New York, NY, USA

M.N. Chatzis, S.P. Triantafyllou, VK. Koumousis, ‘Using analytical sensitivity analysis in box girder design’, Proceedings 9th HSTAM International Congress on Mechanics, 12-14 July, Limassol, Cyprus, 2010.

Conference presentations & invited talks

E. Kakouris, M.N. Chatzis and S.P. Triantafyllou, ‘A Material Point Method for Studying Rocking Systems’, 16th ECEE, June 2018, Thessaloniki, Greece

K. Maes, M.N. Chatzis and G. Lombaert, ‘Observability of structural and mechanical systems with unknown inputs’ EMI 2018, June 2018, MIT, Cambridge MA, U.S.A

X. Shi, M.N. Chatzis and M. Williams, ‘Robust Calculation of the Observability of Large Systems’, EMI 2018, June 2018, MIT, Cambridge MA, U.S.A.

M.N. Chatzis, E.N. Chatzi, ‘Online Bayesian Identification of Non-Smooth Systems’, Proceedings of Eurodyn 2017, September 2017, La Sapienza, Rome

M.N. Chatzis, E.N. Chatzi, ‘A Discontinuous ”D” Variant for Identification of non-smooth systems’, ICOSSAR 2017, TU Wien, Vienna Austria

M. Garcia Espinosa, M.N. Chatzis, ‘Estimating the Risk of Rocking Systems Versus Lifespan’, Compdyn 2017, Rhodes Greece, June 2017

M.N. Chatzis, E.N. Chatzi, ‘Identifying Non-Smooth Systems Using the Discontinuous Modification’, UNCECOMP 2017, Rhodes Greece, June 2017

M.N. Chatzis, E.N. Chatzi, ‘A discontinuous treatment for identifying damage using Kalman Filter’, EMI 2017, UC San Diego, June 2017

M. Garcia Espinosa, M.N. Chatzis ‘A preliminary investigation of methods for generating fragility curves for rocking bodies’, 16th WCEE, Chile January 2017

M.N. Chatzis, E.N. Chatzi ‘A Discontinuous “D”-Variant for Bayesian Recursive Estimators’, EMI-IC 2016, Metz France

M.N. Chatzis, E.N. Chatzi, S. P. Triantafyllou ‘A discontinuous class of filtering methods for the identification of non-smooth dynamical systems’, IALCCE, October 2016, Delft, The Netherlands

M.N. Chatzis, M. Garcia Espinosa ‘A Preliminary Study of the Rocking Response of Artifacts Subjected to Sound Induced Vibrations’, EMI 2016, Vanderbilt University, May 2016

M.N. Chatzis, E.N. Chatzi ‘A Discontinuous Unscented Kalman Filter for Non-Smooth Problems’, EMI 2016, Vanderbilt University, May 2016

R.Y. Greenbaum; A.W. Smyth, M.N. Chatzis ‘Experimental Verification of Common Assumptions Used in the Analysis of the Rocking Motion of Rigid Bodies , EMI 2016, Vanderbilt University, May 2016

M.N. Chatzis, E.N. Chatzi, S.P. Triantafyllou ‘IDENTIFICATION OF NON-SMOOTH DYNAMICS FOR ASSESSING STRUCTURAL PERFORMANCE’, 11HSTAM, Athens, May 2016

M.N. Chatzis, M. Garcia Espinosa ‘A Preliminary Study of the Rocking Response of Artifacts Subjected to Sound Induced Vibrations’, 11HSTAM, Athens, May 2016

S.P. Triantafyllou, M.N. Chatzis, ‘A new damage-healing smooth hysteretic formulation for the modeling of self-healing materials’, 8th GRACM International Congress on Computational Mechanics, Volos, 12 July – 15 July 2015

M.N. Chatzis, F. Ait Brahim ‘A preliminary investigation of lateral impacts in rocking systems’, Engineering Mechanics Institute Conference, June 16-19 2015, Stanford University, Palo Alto, California, U.S.A.

M.N. Chatzis, E.N. Chatzi, S.P. Triantafyllou ‘An adaptive online identification scheme for a phenomenological hysteretic law’, Engineering Mechanics Institute Conference, June 16-19 2015, Stanford University, Palo Alto, California, U.S.A.

M.N. Chatzis, C. Needham, M. Williams ‘An event driven numerical formulation for single and stacked pendulum rocking models’, Engineering Mechanics Institute Conference, August 5-8 2014, McMaster University, Hamilton, Ontario, Canada

E.N. Chatzi, M.N. Chatzis and A.W. Smyth ‘An experimental validation of time domain system identification methods with fusion of heterogeneous data’, Engineering Mechanics Institute Conference, August 5-8 2014, McMaster University, Hamilton, Ontario, Canada

R.Y. Greenbaum, M.N. Chatzis, A.W. Smyth ‘An Experimental Study of the Rocking Motion of Rigid Bodies on Elastic Medium’, Engineering Mechanics Institute Conference, August 5-8 2014, McMaster University, Hamilton, Ontario, Canada

M.N. Chatzis E.N. Chatzi and A.W. Smyth ‘Identification of an experimental structure using heterogeneous observable sensor setups’, Sixth World Conference on Structural Control and Monitoring , Barcelona, Spain, 15-17 July 2014

M.N. Chatzis, E.N. Chatzi and A.W. Smyth ‘Observability and Identifiability methods for Structural Dynamic Systems’,Second International Conference On Vulnerability And Risk Analysis And Management (ICVRAM) And The Sixth International Symposium On Undertainty Modeling And Analysis (ISUMA), July 13-16, 2014, Liverpool, United Kingdom

M.N. Chatzis, E.N. Chatzi and A.W. Smyth ‘Observability and identifiability methods for structural and mechanical systems’, Engineering Mechanics Institute Conference, August 4-7 2013, Northwestern University, Evanston, IllinoisM.N. Chatzis and A.W. Smyth ‘Rocking: From the Inverted Pendulum to the Dynamics of a Die’, Engineering Mechanics Institute Conference, August 4-7 2013, Northwestern University, Evanston, Illinois

M.N. Chatzis and A.W. Smyth ‘A Probabilistic Investigation of the Toppling of Rigid Bodies Experiencing 3D Ground Motions’, 4th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering, June 12-14 2013, Kos Island Greece

M.N. Chatzis and A.W. Smyth ‘Preliminary investigation of the randomness in the outcome of a die throw’, 11th International Conference on Structural Safety & Reliability, June 16-20 2013, New York, NY

M.N. Chatzis and A.W. Smyth ‘A Probabilistic Investigation of the Toppling of Rigid Bodies Experiencing 3D Ground Motions’, Joint Conference of the Engineering Mechanics Institute and 11th ASCE Joint Specialty Conference on Probabilistic Mechanics and Structural Reliability 2012, June 17-20 2012, University of Notre Dame

M.N. Chatzis and A.W. Smyth ‘The 3D Dynamics of a Rigid Body With Wheels on a Moving Base’, Joint Conference of the Engineering Mechanics Institute and 11th ASCE Joint Specialty Conference on Probabilistic Mechanics and Structural Reliability 2012, June 17-20 2012, University of Notre Dame

M.N. Chatzis and A.W. Smyth ‘Modelling of the 3D Rocking Problem’, Engineering Mechanics Institute 2011, June 2-4 2011, Northeastern University, Boston, MA

M.N. Chatzis and A.W. Smyth ‘Toward Robust Modeling of the Rocking Problem’, Engineering Mechanics Institute 2010, August 8-11 2010, University of Southern California, Los Angeles, CA

M.N. Chatzis, S.P. Triantafyllou, VK. Koumousis ‘Using Analytical Sensitivity Analysis in Box Girder Design’, 9th HSTAM International Congress on Mechanics, 12-14 July 2010, Limassol, Cyprus

M.N. Chatzis, S.P. Triantafyllou, VK. Koumousis ‘A Beam Element Formulation for the Non-Uniform Torsion and Distortion of Thin-Walled Closed Sections’ 6th National Conference on Steel Strucures, 2-4 October 2008, Iwannina, Greece.