Performance-Based Design of Concrete-Filled Steel Tube Beam-Columns and Composite Structural Systems: Element Formulations and Design Strategies

Principal Investigator:
Jerome F. Hajjar

Sponsors:
National Science Foundation
American Institute of Steel Construction
Northeastern University
University of Illinois at Urbana-Champaign
University of Minnesota

Graduate Students:
Mark Denavit
Jie Zhang
Cenk Tort
Steven M. Gartner
Brett C. Gourley
Jorge Grauvilardell
Narina Jung
Alexander O. Molodan
Paul H. Schiller
Cenk Tort
Jose Zamudio

Undergraduate Students:
Mahmoud Alloush
Tarik Ata Rafi
Rachel Back
Brian Beck
Wilfred Chan
Mark Chauvin
Kathryna Clarke
Steve Earl
Ryan Hopeman
Ezra Jampole
Saif Jassam
Michael Kehoe
Sarah Keenan
Angela Kingsley
Tyler Krahn
Susan K. La Fore
Gregory S. Lauer
Elisa Livingston
Brett Mattas
Steven Palkovic
Matthew Parkolap
Jill Pinsky
Alston Potts
Abdulrahman Ragab
Alexandra Reiff
Katherine A. Stillwell
Zhuanqiang Tan

Fiber Mesh for the Distributed Plasticity
Concrete-Filled Steel Tube Finite Element Model

For our related recent research on composite beam-columns and composite structural systems, please also see:

System Behavior Factors for Composite and Mixed Structural Systems

For our wiki on Steel-Concrete Composite Structural Systems, containing comprehensive synopses

of the literature on composite construction, please also see:

Steel-Concrete Composite Structural Systems

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• Exceptional strength-to-weight ratio
• Less strength degradation than reinforced concrete sections
• More damping of the structural response than steel
• Steel tube provides natural formwork for pouring concrete
• Rectangular CFT's can handle biaxial bending better than steel or reinforced concrete
• More resistant to fire than steel sections
  

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• Three-dimensional static advanced analysis for non-seismic design
  • Proportion frame to achieve factored loads without reaching limit point
  • Alleviates need to use AISC LRFD interaction equation
• Three-dimensional static "push-over" analysis for seismic design
• Three-dimensional nonlinear dynamic analysis for seismic behavioral evaluation
  

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• Synopsis - To collect and summarize experimental and computational research worldwide on CFT's and highlight areas where more research is warranted
• Finite Element Formulations - To develop two finite element formulations, including a concentrated plasticity "macro" model and a distributed plasticity "fiber" model, to simulate the behavior of rectangular CFT beam-columns subjected to monotonic static loading, cyclic static loading, or transient dynamic loading
• Performance Based Design - To develop reliability-based performance-based design guidelines for rectangular CFT (RCFT) structures
  

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• The axial force and flexural behavior of RCFT's are summarized in the following figures:

Failure Modes for CFT Columns		Failure Modes for CFT Beams
Typical Monotonic Load-Deformation Behavior		Resulting Normalized Cross Section Strength of CFT's

Key Features of Cyclic CFT Behavior

Typical Cyclic CFT Behavior

Resulting Concentrated Plasticity Bounding-Surface Formulation

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Refereed Papers in Journals

Perea, T., Leon, R. T., Hajjar, J. F., and Denavit, M. D. (2014).  “Full-Scale Tests of Slender Concrete-Filled Steel Tubes:  Interaction Behavior,” Journal of Structural Engineering, ASCE, Vol. 140, No. 9, September, Paper No. 04014054 (http://dx.doi.org/10.1061/(ASCE)ST.1943-541X.0000949)

Liu, X.-G., Tao, M.-X., Fan, J.-S., and Hajjar, J. F. (2014). “Comparative Study of Design Procedures for CFST-to-Steel Girder Panel Zone Shear Strength,” Journal of Constructional Steel Research, Vol. 94, March, pp. 114-121. (http://dx.doi.org/10.1016/j.jcsr.2013.11.010)

Perea, T., Leon, R. T., Hajjar, J. F., and Denavit, M. D. (2013).  “Full-Scale Tests of Slender Concrete-Filled Steel Tubes:  Axial Behavior,” Journal of Structural Engineering, ASCE, Vol. 139, No. 7, July, pp. 1249-1262.  (http://dx.doi.org/10.1061/(ASCE)ST.1943-541X.0000784)

Zhang, J., Denavit, M. D., Hajjar, J. F., and Lu, X. (2012).  “Bond Behavior of Concrete-Filled Steel Tube (CFT) Structures,” Engineering Journal, AISC, Vol 49, No. 4, Fourth Quarter, pp. 169-185.

Denavit, M. D. and Hajjar, J. F. (2012). “Nonlinear Seismic Analysis of Circular Concrete-Filled Steel Tube Members and Frames,” Journal of Structural Engineering, ASCE, Vol. 138, No. 9, September, pp. 1089-1098. (http://dx.doi.org/10.1061/(ASCE)ST.1943-541X.0000544)

Tort, C. and Hajjar, J. F. (2010).  “A Mixed Finite Element for 3D Nonlinear Dynamic Analysis of Rectangular Concrete-Filled Steel Tube Beam-Columns,” Journal of Engineering Mechanics, ASCE, Vol. 136, No. 11, November, pp. 1329-1339. (http://dx.doi.org/10.1061/(ASCE)EM.1943-7889.0000179)

Tort, C. and Hajjar, J. F. (2010).  “Mixed Finite Element Modeling of Rectangular Concrete-Filled Steel Tube (RCFT) Members and Frames under Static and Dynamic Loads,” Journal of Structural Engineering, ASCE, Vol. 136, No. 6, June, pp. 654-664. (http://dx.doi.org/10.1061/(ASCE)ST.1943-541X.0000158)

Leon, R. T. and Hajjar, J. F. (2008). “ Limit State Response of Composite Columns and Beam Columns: Part II. Application of Design Provisions for the 2005 AISC Specification,” Engineering Journal, AISC, Vol. 45, No. 1, First Quarter, pp. 21-46.

Leon, R. T., Kim, D. J., and Hajjar, J. F. (2007). “ Limit State Response of Composite Columns and Beam Columns: Part I. Formulation of Design Provisions for the 2005 AISC Specification,” Engineering Journal, AISC, Vol. 44, No. 4, Fourth Quarter, pp. 341-358.

Bruneau, M., Engelhardt, M. D., Filiatrault, A., Goel, S. C., Itani, A., Hajjar, J. F., Leon, R. T. Ricles, J. M., Stojadinovic, B., Uang, C.-M. (2005). “Review of Selected Recent Research on U.S. Seismic Design and Retrofit Strategies for Steel Structures,” Progress in Structural Engineering and Materials, Vol. 7, pp. 103-114. (http://dx.doi.org/doi:10.1002/pse.192)

Tort, C. and Hajjar, J. F. (2004). “Damage Assessment of Rectangular Concrete-Filled Steel Tubes for Performance-Based Design,” Earthquake Spectra, Vol. 20, No. 4, November, pp. 1317-1348. (http://dx.doi.org/10.1061/40826(186)37)

Hajjar, J. F. (2002). “Composite Steel and Concrete Structural Systems for Seismic Engineering,” Journal of Constructional Steel Research, Vol. 58, Nos. 5-8, May-August, pp. 703-723. (http://dx.doi.org/10.1016/S0143-974X(01)00093-1)

Hajjar, J. F. (2000).  “Concrete-Filled Steel Tube Columns under Earthquake Loads,” Progress in Structural Engineering and Materials, Vol. 2, No. 1, pp. 72-82. (http://dx.doi.org/10.1002/(SICI)1528-2716(200001/03)2:1<72::AID-PSE9>3.0.CO;2-E)

Hajjar, J. F., Schiller, P. H., and Molodan, A. (1998).  “A Distributed Plasticity Model for Concrete-Filled Steel Tube Beam-Columns with Interlayer Slip,” Engineering Structures, Vol. 20, No. 8, August, pp. 663-676. (http://dx.doi.org/doi:10.1016/S0141-0296(97)00107-7)

Hajjar, J. F., Molodan, A., and Schiller, P. H. (1998).  “A Distributed Plasticity Model for Cyclic Analysis of Concrete-Filled Steel Tube Beam-Columns and Composite Frames,”  Engineering Structures, Vol. 20, Nos. 4-6, April-June, pp. 398-412. .(http://dx.doi.org/10.1016/S0141-0296(97)00020-5)

Hajjar, J. F., Gourley, B. C., and Olson, M. C. (1997).  “A Cyclic Nonlinear Model for Concrete-Filled Tubes.  II.  Verification,” Journal of Structural Engineering, American Society of Civil Engineers, Vol. 123, No. 6, June, pp. 745-754. (http://dx.doi.org/10.1061/(ASCE)0733-9445(1997)123:6(745))

Hajjar, J. F. and Gourley, B. C. (1997).  “A Cyclic Nonlinear Model for Concrete-Filled Tubes.  I.  Formulation,” Journal of Structural Engineering, American Society of Civil Engineers, Vol. 123, No. 6, June, pp. 736-744. (http://dx.doi.org/10.1061/(ASCE)0733-9445(1997)123:6(736))

Hajjar, J. F. and Gourley, B. C. (1996).  ”Representation of Concrete-Filled Steel Tube Cross-Section Strength,“ Journal of Structural Engineering, American Society of Civil Engineers, Vol. 122, No. 11, November, pp. 1327-1336. (http://dx.doi.org/10.1061/(ASCE)0733-9445(1996)122:11(1327))

Refereed Papers in Conference Proceedings

Tort, C. and Hajjar, J. F. (2010). “A Mixed-Finite Element Approach for Performance-Based Design of Rectangular Concrete-Filled Steel Tube (RCFT) Frames,” Composite Construction in Steel and Concrete VI, United Engineering Foundation, American Society of Civil Engineers, Reston, Virginia, pp. 591-603. (paper)

Tort, C. and Hajjar, J. F. (2005).  “Damage Assessment for Performance-Based Design of Rectangular Concrete-Filled Steel Tubes,” Composite Construction in Steel and Concrete V, Leon, R. T. and Lange, J. (eds.), United Engineering Foundation, American Society of Civil Engineers, Reston, Virginia, pp. 390-401. (paper)

Hajjar, J. F., Gourley, B. C., Schiller, P. H., Molodan, A., and Stillwell, K. A. (1997).  “Seismic Analysis of Concrete-Filled Steel Tube Beam-Columns and Three-Dimensional Composite Frames,” Composite Construction in Steel and Concrete III, Buckner, D. C. and Shahrooz, B. M. (eds.), Engineering Foundation, American Society of Civil Engineers, New York, pp. 75-88.

Papers in Conference Proceedings

Denavit, M., Hajjar, J. F., Leon, R. T., and Perea, T. (2015).  “Advanced Analysis and Seismic Design of Concrete-Filled Steel Tube Structures,” Proceedings of the 2015 SEI Structures Congress, Portland, Oregon, April 23-25, 2015, ASCE, Reston, Virginia. (paper)

Denavit, M. D., Hajjar, J. F., Leon, R. T., and Perea, T. (2014). “Analysis and Design of Steel-Concrete Composite Frame Systems,” Proceedings of the ASCE/SEI Structures Congress 2014, Boston, Massachusetts, April 3-5, 2014. (paper)

Denavit, M. D., Hajjar, J. F., Perea, T., and Leon, R. T. (2013).  “Seismic Safety and United States Design Practice for Steel-Concrete Composite Frame Structures,” Proceedings of the 10th Conference or Urban Earthquake Engineering, Tokyo, Japan, March 1-2, 2013, Tokyo Institute of Technology, Tokyo, Japan. (paper)

Denavit, M. D., Hajjar, J. F., and Leon, R. T. (2012). “Stability Analysis and Design of Steel-Concrete Composite Columns,” Proceedings of the Structural Stability Research Council Annual Stability Conference, Grapevine, Texas, April 17-20, 2012, SSRC, Rolla, Missouri. Received the 2012 SSRC Vinnakota Award for the best paper presented by a student (M. Denavit). (paper)

Hajjar, J. F., Denavit, M. D., Perea, T., and Leon, R. T. (2012). “Seismic Design and Stability Assessment of Composite Framing Systems,” Proceedings of the 9th Conference or Urban Earthquake Engineering, Tokyo, Japan, March 6-8, 2012, Tokyo Institute of Technology, Tokyo, Japan. (paper)

Leon, R. T., Perea, T., Hajjar, J. F., and Denavit, M. D. (2011). “Concrete-filled Tubes Columns and Beam-Columns: A Database for the AISC 2005 and 2010 Specifications,” Festschrift Gerhard Hanswille, Wuppertal, Germany, October 1-3, 2011,IKIB, Wuppertal, Germany, pp. 203-212. (paper)

Hajjar, J. F. and Denavit, M. D. (2011). “New Trends for Seismic Engineering of Steel and Composite Structures,” Third International Symposium on Innovative Design of Steel Structures, Singapore and Hong Kong, June 28-30, 2011, University of Hong Kong, Hong Kong, pp. 41-56. (paper)

Denavit, M. D., Hajjar, J. F., and Leon, R. T. (2011).  “Seismic Behavior of Steel Reinforced Concrete Beam-Columns and Frames,” Proceedings of the ASCE/SEI Structures Congress 2011, Las Vegas, Nevada, April 14-16, 2011, ASCE, Reston, Virginia. (paper)

Perea, T., Leon, R. T., Denavit, M., and Hajjar, J. F. (2010).  “Experimental Tests on Cyclic Beam-Column Interaction Strength of Concrete-Filled Steel Tubes,” Proceedings of the 9th National Conference on Earthquake Engineering, Rathje, E. M. and Atkinson, G. A. (eds.), Toronto, Canada, July 12-14, 2010, Earthquake Engineering Research Institute, Oakland, California. (paper)

Denavit, M. D., Hajjar, J. F., Perea, T., and Leon, R. T. (2010).  “Cyclic Evolution of Damage and Beam-column Interaction Strength of Concrete-Filled Steel Tube Beam-Columns,” Proceedings of the 9th National Conference on Earthquake Engineering, Rathje, E. M. and Atkinson, G. A. (eds.), Toronto, Canada, July 12-14, 2010, Earthquake Engineering Research Institute, Oakland, California. (paper)

Leon, R. T., Perea, T., Hajjar, J. F., and Denavit, M. D. (2009).  “Determination of Buckling Loads from Triaxial Load Tests of Slender Concrete-Filled Steel Tube Beam-Columns,” Proceedings of the Third International Conference on Advances in Experimental Structural Engineering, San Francisco, California, October 15-16, 2009. (paper)

Denavit, M., Hajjar, J. F., Perea, T., and Leon, R. T. (2009).  “Seismic Multi-Axial Behavior of Concrete-Filled Steel Tube Beam-Columns,” Proceedings of the Asian-Pacific Network of Centers for Earthquake Engineering Research, Urbana, Illinois, August 13-14, 2009. (paper)

Tort, C. and Hajjar, J. F. (2007). “A Mixed Finite Element Approach for Nonlinear Dynamic Analysis of Composite Rectangular Concrete-Filled Steel Tube (RCFT) Frames,” Proceedings of Computational Methods in Structural Dynamics and Earthquake Engineering, Rethymno, Greece, June 13-16, 2007, National Technical University of Athens, Athens, Greece. (paper)

Tort, C. and Hajjar, J. F. (2007). “A Performance-Based Design Approach for Rectangular Concrete-Filled Steel Tube (RCFT) Frames under Seismic Loading,” Proceedings of the ASCE/SEI Structures Congress 2007, Long Beach, California, May 17-19, 2007, ASCE, Reston, Virginia. (paper)

Tort, C. and Hajjar, J. F. (2006). Seismic Demand and Capacity Evaluation of Rectangular Concrete-Filled Steel Tube (RCFT) Members and Frames," Proceedings of the Fifth Behaviour of Steel Structures in Seismic Areas (STESSA 2006), Mazzolani, F. M. (ed.), Yokohama, Japan, August 14-17, 2006, Taylor and Francis, London, pp. 651-656. (paper)

Tort, C. and Hajjar, J. F. (2006).  “Development of Seismic Demand and Capacity Assessment Methodology for Rectangular Concrete-Filled Steel Tube (RCFT) Members and Frames,” Eighth National Conference on Earthquake Engineering, San Francisco, California, April 18-22, 2006, Earthquake Engineering Research Institute, Oakland, California. (paper)

Tort, C. and Hajjar, J. F. (2005).  “Capacity Assessment of Rectangular Concrete-Filled Steel Tube (RCFT) Members and Connections in Composite Frames,” Proceedings of the American Society of Civil Engineering Structures Congress ’05, New York, New York, April 20-24, 2005, ASCE, Reston, Virginia. (paper)

Tort, C. and Hajjar, J. F. (2003).  “Damage Measures for Performance-Based Design of Rectangular Concrete-Filled Steel Tube Members and Connections,” International Workshop on Steel and Concrete Composite Construction (IWSCCC-2003), National Center for Research on Earthquake Engineering, Taipei, Taiwan, October 8-9, 2003, National Center for Research on Earthquake Engineering, Taipei, Taiwan, 35-46. (paper)

Hajjar, J. F., Gourley, B. C., and Stillwell, K. (1996).  “Cyclic Analysis of Concrete-Filled Tubes and Design of Composite Frames,” Analysis and Computation, Proceedings of the Twelfth Conference held in Conjunction with the American Society of Civil Engineers Structures Congress ’96, Cheng, F. Y. (ed.), Chicago, Illinois, April 15-18, 1996, ASCE, New York, pp. 43-54. 

Technical Reports

Denavit, M. D. and Hajjar, J. F. (2014). “Characterization of Behavior of Steel-Concrete Composite Members and Frames with Applications for Design, ,” Report No. NSEL-034, Newmark Structural Laboratory Report Series (ISSN 1940-9826), Department of Civil and Environmental Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois, August, 683 pp. (report)

Denavit, M. D. and Hajjar, J. F. (2013). “Description of Geometric Nonlinearity for Beam-Column Analysis in OpenSees,” Report No. NEU-CEE-2013-02, Department of Civil and Environmental Engineering, Northeastern University, Boston, Massachusetts, 12 pp. (report)

Denavit, M. D. and Hajjar, J. F. (2010).  “Nonlinear Seismic Analysis of Circular Concrete-Filled Steel Tube Members and Frames,” Report No. NSEL-023, Newmark Structural Laboratory Report Series (ISSN 1940-9826), Department of Civil and Environmental Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois, March. (report)

Gourley, B. C., Tort, C., Denavit, M. D., Schiller, P. H., and Hajjar, J. F. (2008). “A Synopsis of Studies of the Monotonic and Cyclic Behavior of Concrete-Filled Steel Tube Beam-Columns,” Report No. NSEL-008, Newmark Structural Laboratory Report Series (ISSN 1940-9826), Department of Civil and Environmental Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois, Version 4.0, April. (report)

Tort, C. and Hajjar, J. F. (2007). “ Reliability-Based Performance-Based Design of Rectangular Concrete-Filled Steel Tube (RCFT) Members and Frames,” Structural Engineering Report No. ST-07-1, Department of Civil Engineering, University of Minnesota, Minneapolis, Minnesota, August, 401 pp. (report)

Gartner, S. M. and Hajjar, J. F. (2006). “Design and Evaluation of Rectangular Concrete Filled Tube (RCFT) Frames for Seismic Demand Assessment,” Structural Engineering Report No. ST-06-01, Department of Civil Engineering, University of Minnesota, Minneapolis, Minnesota, May, 266 pp. (report)

La Fore, S. and Hajjar, J. F. (2005).  “Design of Concrete-Filled Steel Tube Frames for Assessment under Seismic Loading,” Structural Engineering Report No. ST-05-02, Department of Civil Engineering, University of Minnesota, Minneapolis, Minnesota, May, 217 pp.

Tort, C. and Hajjar, J. F. (2003). “Damage Assessment of Concrete-Filled Steel Tube Members and Frames,” Report No. ST-03-1, Department of Civil Engineering, University of Minnesota, Minneapolis, Minnesota, April, 339 pp. (report)

Gourley, B. C., Tort, C., Hajjar, J. F., and Schiller, P. H. (2001). "A Synopsis of Studies of the Monotonic and Cyclic Behavior of Concrete-Filled Steel Tube Beam-Columns," Structural Engineering Report No. ST-01-4, Department of Civil Engineering, University of Minnesota, Minneapolis, Minnesota, Version 3.0, December, 262 pp. (report)

Molodan, A. and Hajjar, J. F. (1997).  “A Cyclic Distributed Plasticity Model for Three-Dimensional Concrete-Filled Steel Tube Beam-Columns and Composite Frames,” Structural Engineering Report No. ST-96-6, Department of Civil Engineering, University of Minnesota, Minneapolis, Minnesota, August, 123 pp. (report)

Fetterer, K. A. and Hajjar, J. F. (1997).  “Prototype Design of Composite Unbraced Frames using Concrete-Filled Steel Tube Beam-Columns,” Structural Engineering Report No. ST-96-7, Department of Civil Engineering, University of Minnesota, Minneapolis, Minnesota, July, 80 pp. 

Hajjar, J. F., Schiller, P. H., and Molodan, A. (1997), “A Distributed Plasticity Model for Concrete-Filled Steel Beam-Columns with Interlayer Slip.  Part I.  Slip Formulation and Monotonic Analysis. Part II.  Constitutive Formulation and Cyclic Analysis,” Structural Engineering Report No. ST-97-1, Department of Civil Engineering, University of Minnesota, Minneapolis, Minnesota, February, 95 pp. 

Schiller, P. H. and Hajjar, J. F. (1996).  “A Distributed Plasticity Formulation for Three-Dimensional Rectangular Concrete-Filled Steel Tube Beam-Columns and Composite Frames,” Structural Engineering Report No. ST-96-5, Department of Civil Engineering, University of Minnesota, Minneapolis, Minnesota, November, 226 pp. (report)  

Hajjar, J. F. and Gourley, B. C. (1995).  “A Cyclic Nonlinear Model for Concrete-Filled Tubes. I. Formulation,” and Hajjar, J. F., Gourley, B. C., and Olson, M. C. (1995).  “A Cyclic Nonlinear Model for Concrete-Filled Tubes. II. Verification,” Structural Engineering Report No. ST-95-3, Department of Civil Engineering, University of Minnesota, Minneapolis, Minnesota, August, 98 pp. 

Hajjar, J. F. and Gourley, B. C. (1995).  “Representation of Concrete-Filled Steel Tube Cross-Section Strength,” Structural Engineering Report No. ST-95-2, Department of Civil Engineering, University of Minnesota, Minneapolis, Minnesota, August, 47 pp. 

Jang, S. and Hajjar, J. F. (1995).  “Design of an Experimental Test Facility to Study Concrete-Filled Steel Tube Beam-Columns Subjected to Nonproportional, Nonuniform Bending Moment Plus Axial Force,” Structural Engineering Report No. ST-95-1, Department of Civil Engineering, University of Minnesota, Minneapolis, Minnesota, July, 69 pp. 

Gourley, B. C., Hajjar, J. F., and Schiller, P. H. (1995).  “A Synopsis of Studies of the Monotonic and Cyclic Behavior of Concrete-Filled Steel Tube Beam-Columns,” Structural Engineering Report No. ST-93-5.2, Department of Civil Engineering, University of Minnesota, Minneapolis, Minnesota, Version 2.0, June, 133 pp. 

Gourley, B. C. and Hajjar, J. F. (1994).  “Cyclic Nonlinear Analysis of Three-Dimensional Concrete-Filled Steel Tube Beam-Columns and Composite Frames,” Structural Engineering Report No. ST-94-3, Department of Civil Engineering, University of Minnesota, Minneapolis, Minnesota, November, 216 pp. 

Schiller, P. H., Hajjar, J. F., and Gourley, B. C. (1994).  “Expressions for the Elastic Rigidity of Rectangular Concrete-Filled Steel Tube Beam-Columns,” Structural Engineering Report No. ST-94-2, Department of Civil Engineering, University of Minnesota, Minneapolis, Minnesota, September, 15 pp. 

Gourley, B. C. and Hajjar, J. F. (1994).  “Representation of Cross-Section Strength for Low and High Strength Rectangular Concrete-Filled Steel Tubes,” Structural Engineering Report No. ST-94-1, Department of Civil and Mineral Engineering, University of Minnesota, Minneapolis, Minnesota, February, 93 pp. 

Gourley, B. C. and Hajjar, J. F. (1993).  “A Synopsis of Studies of the Monotonic and Cyclic Behavior of Concrete-Filled Steel Tube Beam-Columns,” Structural Engineering Report No. ST-93-5.1, Department of Civil and Mineral Engineering, University of Minnesota, Minneapolis, Minnesota, Version 1.0, October, 101 pp. 

Invited Lectures

“Post-Northridge Advances in Composite and Hybrid Structural Systems,” 2014 North American Steel Construction Conference, Toronto, Canada, March 25-27, 2014.

“Post-Northridge Advances in Composite and Hybrid Structural Systems,” Northridge 20 Symposium:  The 1994 Northridge Earthquake:  Impact, Outcomes, and Next Steps, Los Angeles, California, January 16-17, 2014.

“Summary of Stability Studies for Composite Systems,” American Institute of Steel Construction Specification Task Committee on Composite Construction and Task Committee 10 on Stability, Chicago, Illinois, November 17, 2011.

“Overview of Composite Construction in the 2010 AISC Seismic Provisions,” North American Steel Construction Conference 2011, Pittsburgh, Pennsylvania, May 11-14, 2011.

“Behavioral Assessment of Concrete-Filled Steel Tube Structures for Seismic Excitation,” Department of Architecture and Building Engineering, Tokyo Institute of Technology, Tokyo, Japan, July 22, 2009.

“Behavioral Assessment of Concrete-Filled Steel Tube Structures:  Computational and Experimental Response for Performance-Based Design,” Laboratoire de Genie Civil et Genie Mecanique, Génie Civil et Urbanisme, INSA de Rennes, Rennes, France, June 2, 2009.

“New Developments in Earthquake Engineering of Steel and Composite Structures,” School of Civil Engineering, Tsinghua University, Beijing, China, October 17, 2008.

“New Developments in Earthquake Engineering of Steel and Composite Structures,” North American Steel Construction Conference, Nashville, Tennessee, April 3, 2008.

“Behavioral Assessment of Concrete-Filled Steel Tube Members and Frames: Formulations for Performance-Based Design,” Department of Civil and Environmental Engineering, Rensselaer Polytechnic Institute, Troy, New York, October 24, 2007.

“Behavioral Assessment of Concrete-Filled Steel Tube Members and Frames:  Formulations for Performance-Based Design,” Department of Civil and Environmental Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois, November 6, 2006.

“Behavior and Design of Concrete-Filled Steel Tube Members and Frames,” American Concrete Institute Concrete Conference:  Bridging the Carolinas:  Fast Track Innovations, Charlotte, North Carolina, March 26-30, 2006.

“Nonlinear Finite Element Analysis of Concrete-Filled Steel Tube Beam-Columns and Composite Frame Structures,” Department of Civil and Environmental Engineering, University of California at Berkeley, Berkeley, California, April 23, 2001.

“Cyclic Analysis of Concrete-Filled Steel Tube Beam-Columns and Composite Frames:  Distributed Plasticity Formulation,” Department of Civil and Environmental Engineering,Stanford University, Stanford, California, October 16, 2000.

“Cyclic Analysis of Concrete-Filled Steel Tube Beam-Columns and Composite Frames:  Concentrated Plasticity Formulation,” Department of Civil and Environmental Engineering, Stanford University, Stanford, California, August 28, 2000.

“Nonlinear Finite Element Analysis of Concrete-Filled Steel Tubes and Composite Frames,” Department of Civil and Environmental Engineering, University of Illinois, Urbana-Champaign, Illinois, April 26, 1999.

“Cyclic Analysis of Concrete-Filled Steel Tube Beam-Columns and Composite Frame Structures,” Third U.S.-Japan Joint Seminar on Innovations in Stability Concepts and Methods for Seismic Design in Structural Steel, Honolulu, Hawaii, July 15-18, 1996.

Conference Presentations

Hajjar, J. F., Denavit, M. D., Perea, T., and Leon, R. T., (2013).  “New Strategies for Design of Steel-concrete Composite Members and Frames,” Composite Construction in Steel and Concrete VII, Palm Cove, Australia, July 28-August 1, 2013.

Denavit, M. D., Hajjar, J. F., Perea, T., and Leon, R. T. (2011). “Cyclic Evolution of Beam-Column Interaction Strength of Concrete-Filled Steel Tube Beam-Columns,” 2011 Engineering Mechanics Institute Conference, American Society of Civil Engineers, Northeastern University, Boston, Massachusetts, June 2-4, 2011.

Hajjar, J. F. (2011). “Overview of Composite Construction in the 2010 AISC Seismic Provisions,” North American Steel Construction Conference 2011, Pittsburgh, Pennsylvania, May 11-14, 2011.

Hajjar, J. F. (2010). “Behavior and Design of Composite Column Systems: Recent Research and New Provisions,” North American Steel Construction Conference, Orlando, Florida, May 12-15, 2010.

Hajjar, J. F. (2010). “An Overview of Composite Construction in the 2010 AISC Seismic Provisions,” ASCE/SEI Structures Congress 2010, Orlando, Florida, May 12-14, 2010.

Hajjar, J. F., Varma, A. H., Bursi, O., and Hitaka, T. (2009). “Seismic Engineering of Composite Structures: A World Overview,” ASCE/SEI Structures Congress 2009, Austin, Texas, April 30-May 2, 2009, ASCE, Reston, Virginia.

Perea, T., Leon, R. T., and Hajjar, J. F. (2008). “Behavior of Composite CFT Beam-Columns Based on Nonlinear Fiber Element Analysis,”Composite Construction in Steel and Concrete VI, United Engineering Foundation, Tabernash, Colorado, July 20-24, 2008.

Tort, C. and Hajjar, J. F. (2006). “Behavior and Design of Concrete-Filled Steel Tube Members and Frames,” American Concrete Institute Concrete Conference: Bridging the Carolinas: Fast Track Innovations, Charlotte, North Carolina, March 26-30, 2006.