Professor Manolis Chatzis

Fellow and Tutor in Engineering

Associate Professor in Engineering Science

Subjects: 
Engineering
Qualifications: 
MSc, MPhil, PhD
Phone number: 
01865 279439

Manolis 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''. He then 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 

Manolis' work is focused in the field of Dynamic Systems and Earthquake Engineering. An important direction is to accurately model and quantify the risk for components that are not tied or bolted to their support medium, unlike what is typically done in Civil Engineering structures, and thus are allowed to slide, rock and twist when subjected to ground motions. This applies to both structural components as well as non-structural, such as seismically isolated buildings, museum artifacts, hospital equipment, electrical transformers, supercomputers or even household equipment.

A second direction of focus is that of System Identification and Observability of nonlinear structural systems. The  goals of this research are to determine the required sensor setups that result in identifying the properties of a structure (Observability), to find suitable combinations of sensors that make the most of the capabilities of each instrument (Data Fusion) and finally to identify the properties of a structure using numerical algorithms (System Identification), which has important applications in determining the Reliability of our infrastructure. A special focus of this research is on the behavior of non-smooth systems, which typically correspond to physical problems involving damage, sliding or impacts.

Publications 

PAPERS

Journal:

• M. N. Chatzis, E. N. Chatzi, 'A Discontinuous Unscented Kalman Filter for Non-Smooth Dynamic Problems', Frontiers in Built Environment, accepted 2017

• 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)

• ANDREW W. SMYTH, PATRICK BREWICK, RAPHAEL GREENBAUM, M. CHATZIS , ANNA SEROTTA  AND ISABEL 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, “A 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

Proceedings:

• 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, V K. 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

• 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

• Maria 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 

• Manolis Chatzis, Maria 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

• Raphael Greenbaum; Andrew Smyth, Manolis 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

• Manolis Chatzis, Maria 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. Greenbaum, M. Chatzis, A. 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, Illinois

• M.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 “Modeling 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, V K. 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, V K. 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.