Constantin Christopoulos

Professor

Canada Research Chair in Seismic Resilience of Infrastructure

Background

Research Interests

Projects

Publications

Teaching

News

Contact

Constantin Christopoulos, portrait

Background

Professor Christopoulos’ research is primarily focused on the development of advanced high-performance structural systems that enhance the dynamic response and seismic resilience of built infrastructure.

The research involves advanced large-scale testing of new structural systems in the Structures Laboratories, simulations using advanced finite element models and the development of new design methods for the implementation of advanced resilient seismic resistant systems.

Professional and Tech Transfer Activities

Professor Christopoulos also acts as a consultant on projects involving the implementation of advanced damping and isolation technologies in structures.

He is also actively involved in the development and transfer into the market of new technologies developed through research carried out at the University of Toronto. He is a co-founder of U of T spinoff companies Cast Connex which specializes in cast steel connections and casting design and Kinetica Dynamics which markets the viscoelastic coupling damper for high-rise buildings.

Education and Designations

B.A.Sc. (École Polytechnique de Montréal)
M.A.Sc. (École Polytechnique de Montréal)
Ph.D. (University of California San Diego)
P.Eng.

Research Interests

Development of self-centering seismic resistant systems

Use of steel castings to enhance the seismic performance of infrastructure

Development of wind and earthquake damping systems for high-rise buildings

Development of seismic isolation and energy dissipation devices

Study of the non-linear dynamics of structures

Development of design methodologies for structures incorporating damping and isolation devices

Vibration-based health monitoring of structures

Presentations & Projects

Vibration Based Damage Detection through an Experimental Modal Analysis of a Fixed Fixed Steel Beam Using Impact Loading

Student: Stephanie D’Addese, BASc Candidate This project was aimed at investigating a means of detecting damage within a beam through an experimental modal analysis. It used a commercial software package to model a steel tube so that modal properties such as natural frequency and mode shape could be obtained. Once the modal parameters of the tube were attained for… Read more »

Cast Fuse Elements for Seismic Braces

Student: Michael Gray, MASc Candidate The goal of this research program is to develop a cast steel-yielding element that will enhance the seismic performance of concentrically braced frame steel structures. The element is intended to be the source of the inelastic energy dissipation during an earthquake while remaining elastic under wind loads.  The casting’s performance will… Read more »

Advanced Numerical Evaluation of the Seismic Response of Existing Under-Designed Reinforced Concrete Buildings and of the Effectiveness of Retrofit Strategies

Student: Gulsah Sagbas, M.A.Sc. Candidate This research project focuses on advanced numerical evaluation of the seismic response of existing under-designed reinforced concrete buildings and the effectiveness of retrofit strategies. A numerical evaluation of non-seismically designed beam-column subassemblies retrofitted by a low invasive retrofitting technique using VecTor2 will be performed. This research will be collaborative study between University of… Read more »

Cast Steel Connector for Tubular Braces in Seismic Building Applications

Hollow structural sections (HSS) are the most efficient structural shape available for carrying axial loads.  Unfortunately, designing and detailing HSS end connections to resist seismic type inelastic brace member loading has proven to be very difficult.  Consequently, brittle failure of HSS brace member end connections have been observed in recent earthquakes.  Because of the low… Read more »

Development of High-Performance Seismic Force-Resisting Systems for Mid-Rise Steel Buildings

Student: Lydell Wiebe, PhD Candidate This research topic is in the field of innovative structural systems for the resistance of seismic loading. The objective is to significantly improve the performance of mid-rise steel buildings under seismic loads by applying new systems that are currently being developed at the University of Toronto . These systems use post-tensioning and… Read more »

Development of Eccentric Braced Frames (EBF) and Moment Resisting Frames (MRF) with Replaceable Nonlinear Links

Student: Nabil Mansour, Ph.D. Candidate Steel EBF and MRF structures designed according to the latest seismic design specification are expected to sustain damage during a design level earthquake through repeated inelastic deformation and localized buckling. Repair is therefore expected to be costly and disruptive, even if the structure has met its goal of providing life safety during… Read more »

Development of a Passive Damping System for High-rise Coupled Structural Wall Buildings

Student: Michael Montgomery, Ph.D. Candidate As buildings increase in height and slenderness they become increasingly sensitive to wind and seismic dynamic vibrations. Currently, when engineers are faced with vibration perception problems, they must either, reduce the height of the building, increase the lateral stiffness of the structural system, or use specialized vibration absorbers such as… Read more »

Friction-Damped, Post-tensioned, Self-Centering, Steel Moment Resisting Frames

Researcher: Hyungjoon Kim, Ph.D. Candidate New connections for steel moment-resisting frames that incorporate posttensioning elements to provide a self-centering capacity along with energy dissipating mechanisms to dissipate energy have been studied and experimentally validated. The connection for SMRFs in the study introduces a bolt-prestressed friction mechanism as an energy dissipating device of which friction interface consists… Read more »

Validation, design and implementation of new Self-Centering Steel Braces

Researcher: Hyunhoon Choi, Postdoctoral Fellow In this research project the 2-D and 3-D seismic response of steel braced frames incorporating traditional and more advanced bracing systems is investigated using nonlinear time-history analyses. The study includes the design of 6 buildings of different configurations and heights located in a high seismic area using traditional braced systems, Buckling Restrained… Read more »

Publications

 
Christopoulos C. and Filiatrault, A., Principles of Supplemental Damping and Seismic Isolation, IUSS Press, Milan, Italy, 2006, 500 p. (Book)
Filiatrault, A., Tremblay, R., Christopoulos, C., Folz, B. and Pettinga, D., Elements of Earthquake Engineering and Structural Dynamics, Third Edition, Polytechnic International Press, 2013, 900 p. (Book)
Gray, M., Christopoulos, C. and Packer, J., 2013. “Cast Steel Yielding Brace System (YBS) for Concentrically Braced Frames: Concept Development and Experimental Validations, ASCE Journal of Structural Engineering, (under review).
Guo, W.W. and Christopoulos, C., 2012. “Performance-Spectra Based Method for the Seismic Design of Structures Equipped with Passive Supplemental Damping Systems”, Earthquake Engineering and Structural Dynamics, (in press).
Guo, W.W. and Christopoulos, C., 2012. “A Simplified Procedure for Generating Performance Spectra for Structures Equipped with Passive Supplemental Dampers”, Earthquake Engineering and Structural Dynamics, (in press).
Kyriakopoulos, N. and Christopoulos, C., 2012. “Seismic Assessment and Upgrade of Type 2 Steel MRFs Built In Canada Between the 1960s and 1980s Using Passive Supplemental Damping”, Canadian Journal of Civil Engineering, (under review).
Erochko, J., Christopoulos, C. and Tremblay, R., 2012. “Shake Table Testing of a Three-Story Self-Centering Energy Dissipative (SCED) Braced Frame,” Earthquake Engineering and Structural Dynamics, (in press).
Wiebe L., Christopoulos C., Tremblay R. and Leclerc M., 2012. “Mechanisms to Limit Higher Mode Effects in a Controlled Rocking Steel Frame”, Earthquake Engineering and Structural Dynamics, (in press).
Wiebe L., Christopoulos C., Tremblay R. and Leclerc M., 2012. “Large-Amplitude Shake Table Testing of Higher Mode Controlled Rocking Steel Frame”, Earthquake Engineering and Structural Dynamics, (in press).
Areemit, N., Montgomery, M., Christopoulos, C. and Hasan, A., 2012. “Experimental Identification of the Dynamic Properties of a Coupled Shear Wall Residential High-Rise Building in Toronto”, Canadian Journal of Civil Engineering, Vol. 39(6), pp. 631-642.
Sagbas, G., Vecchio, F.J. and Christopoulos, C., 2011. “Computational Modeling of the Seismic Performance of Beam-Column Subassemblies”, Journal of Earthquake Engineering, Vol. 15 (4), pp. 640-663.
Wiebe, L. and Christopoulos, C., 2010. “Using Bézier Curves to Model Gradual Stiffness Transitions in Nonlinear Elements: Application to Self-Centering Systems”, Earthquake Engineering and Structural Dynamics, Vol. 40 (14), pp. 1535–1552.
Shen, Y., Christopoulos, C., Mansour, N. and Tremblay, R., 2011. “Seismic Design and Performance of Steel Moment Resisting Frames with Nonlinear Replaceable Links”, ASCE Journal of Structural Engineering, ASCE Journal of Structural Engineering, Vol. 137(10), pp. 202-214.
Mansour, N., Christopoulos, C. and Tremblay, R., 2011. “Experimental Validation of Replaceable Shear Links for Eccentrically Braced Steel Frames”, ASCE Journal of Structural Engineering, Vol. 137(10), pp. 1141-1153.
Herion, S., de Oliveira, J.C., Packer, J.A., Christopoulos, C. and Gray, M.G., 2010. “Castings in Tubular Structures – State-of-the-Art”, Structures and Buildings, Institution of Civil Engineers, Vol. 163, Issue SB6, pp. 403–415.
Erochko, J., Christopoulos, C., Tremblay, R. and Choi, H., 2010. “Residual Drift Response of SMRFs and BRB Frames in Steel Buildings Designed According to ASCE7-05”, ASCE Journal of Structural Engineering, Vol. 137(5), pp. 589-600.
Nuta, E., Christopoulos, C. and Packer, J.A., 2010. “Methodology for Seismic Risk Assessment for Tubular Steel Wind Turbine Towers: Application to Canadian Seismic Environment”, Canadian Journal of Civil Engineering, Vol. 38(3), pp. 293-304.
**** Winner of 2012 - Sir Casimir Gzowski Medal ****

Wiebe, L. and Christopoulos, C., 2010. “Characterizing Acceleration Spikes due to Stiffness Changes in Nonlinear Systems”, Earthquake Engineering and Structural Dynamics, Vol. 39 (14), pp. 1653–1670.
Uma, S. R., Pampanin, S. and Christopoulos, C., 2010.” Development of Probabilistic Framework for Performance-Based Seismic Assessment of Structures Considering Residual Deformations”, Journal of Earthquake Engineering, Vol. 14(7), pp. 1092-1111.
Wiebe, L. and Christopoulos, C., 2009. “Mitigation of Higher Mode Effects in Base- Rocking Systems by Using Multiple Rocking Sections”, Journal of Earthquake Engineering, Vol. 13(S1), pp. 83-108.
Kim, H.-J. and Christopoulos, C., 2009. “Numerical Modeling and Ductile Ultimate Deformation Response of Post-Tensioned Self-Centering Moment-Resisting Steel Frames”, Earthquake Engineering and Structural Dynamics, Vol. 38(1), pp. 1-21.
Kim, H.-J. and Christopoulos, C., 2009. “Seismic Design Procedure and Seismic Response of Self-Centering Post-Tensioned Steel Moment-Resisting Frames”, Earthquake Engineering and Structural Dynamics, Vol. 38(3), pp. 355-376.
Martinez-Saucedo, G., Packer, J.A. and Christopoulos, C., 2008. “Gusset Plate Connections to Circular Hollow Section Braces under Inelastic Cyclic Loading”, ASCE Journal of Structural Engineering, Vol. 134(7), pp. 1252-1258.
Kim, H.-J. and Christopoulos, C., 2008. “Friction Damped Post-Tensioned Self- Centering Steel Moment Resisting Frames”, ASCE Journal of Structural Engineering Vol. 134(11), pp. 1768-1779. de Oliveira, C., Packer, J.A. and Christopoulos, C., 2008. “Cast Steel Connectors for CHS Brace Members in Seismic Applications”, ASCE Journal of Structural Engineering, Vol. 134(3), pp. 374-383.
Christopoulos, C., Tremblay, R., Kim, H.-J. and Lacerte, M., 2008. “The Self-Centering Energy Dissipative (SCED) Bracing System for the Seismic Resistance of Structures”, Journal of Structural Engineering, Vol. 134(1), pp. 96-107.
Tremblay, R., Lacerte, M. and Christopoulos, C., 2008. “Seismic Response of Multi- Storey Buildings with Self-Centering Energy Dissipative Steel Braces”, ASCE Journal of Structural Engineering, Vol. 134(1), pp. 108-120.
Pettinga, D., Christopoulos, C., Pampanin, S. and Priestley, M.J.N., 2007. “Effectiveness of Simple Approaches in Mitigating Residual Deformations in Buildings”, Earthquake Engineering and Structural Dynamics, Vol. 36, No. 12, pp. 1763-1783.
Pettinga, D., Pampanin, S., Christopoulos, C. and Priestley, M.J.N., 2006. “The Role of Inelastic Torsion in the Determination of Residual Deformations”, Journal of Earthquake Engineering, Vol. 11, No. 1, pp. 133-157.
Pampanin, S., Christopoulos, C. and Chen, T.-H., 2006. “Development and Validation of a Metallic Haunch Seismic Retrofit Solution for Existing Under-Designed RC Frames”, Earthquake Engineering and Structural Dynamics, Vol. 35, No. 14, pp. 1739-1766.
Christopoulos, C., Lopez Garcia, D. and Tsai, K.C., 2005. “Educational Reconnaissance of the Area Affected by the 1999 Chi-Chi Earthquake Three Years Later”, Earthquake Spectra, Vol. 20, No.1, pp. 1-22.
Christopoulos, C., 2004. “Frequency-Response of Flag-Shaped SDOF Hysteretic Systems”, ASCE Journal of Engineering Mechanics, Vol. 130, No. 8, pp. 894-903. A14.
Christopoulos, C. and Pampanin, S., 2004. “Towards Performance-Based Design of MDOF Structures with Explicit Consideration of Residual Deformations”, ISET’s Journal of Earthquake Technology, Vol. 41, No.1, pp. 172-193.
Christopoulos, C., Léger P. and Filiatrault, A., 2003. “Seismic Sliding Response Analysis of Gravity Dams Including Vertical Accelerations”, Journal of Earthquake Engineering and Engineering Vibration, Vol. 2, No. 2, pp. 189-200.
Christopoulos, C., Pampanin, S. and Priestley, M.J.N., 2003. “New Damage Index for Framed Systems Based on Residual Deformations: Part I – SDOF Systems”, Journal of Earthquake Engineering, Vol. 7, No. 1, pp. 97-118.
Pampanin, S., Christopoulos, C. and Priestley, M.J.N., 2003. “New Damage Index for Framed Systems Based on Residual Deformations: Part II – MDOF Systems”, Journal of Earthquake Engineering, Vol. 7, No. 1, pp.119-140.
Christopoulos, C., Filiatrault, A. and Folz, B., 2002. “Seismic Response of Self-Centering Hysteretic SDOF Systems”, Earthquake Engineering and Structural Dynamics, Vol. 31, pp. 1131-1150
Christopoulos, C., Filiatrault, A., Uang, C.-M. and Folz, B., 2002. “Post-Tensioned Energy Dissipating Connections for Moment Resisting Steel Frames”, ASCE Journal of Structural Engineering, Vol. 128, No. 9, pp. 1111-1120.

Teaching

Course CodeTitle & DescriptionSessionDay(s)Start TimeEndSection
CIV312HFall 2018Scheduled by the Office of the Faculty Registrar.
CIV1171H
Winter 2019Wednesday & Friday9:0012:00101

News Mentions

CivE PhD Candidate Pedram Mortazavi was one of just five recipients from more than 550 nominated teaching assistants from across the University of Toronto. (Photo: Keenan Dixon)

Pedram Mortazavi wins 2018 TA Teaching Excellence Award

Pedram Mortazavi (CivMin PhD candidate) has won a 2018 TA Teaching Excellence Award from the University of Toronto’s Teaching Assistant Training Program (TATP). Mortazavi, a PhD candidate in the Department of Civil & Mineral Engineering, is one of just five recipients from more than 550 nominated teaching assistants (TAs) across the entire University. He has taught Steel… Read more »

Contact

Constantin Christopoulos
Department of Civil & Mineral Engineering
University of Toronto
35 St. George St.
Toronto, Ontario
Canada, M5S 1A4

 

Tel: 416-978-6238

c.christopoulos@utoronto.ca