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Research

Research Interests

Earthquake engineering, earthquake resiliency, reinforced concrete structures, tall buildings design, nonlinear modeling and analysis, performance-based seismic design, structural instrumentation and testing.

Kristijan Kolozvari standing under a skyline

Externally Funded Research Projects

July 2017 - June 2018, "Enhanced Ductility RC Coupled Wall Systems", $85,000, Charles Pankow Foundation/UCLA.

May 2017 - Dec 2017, "Experimental Testing of Hugging Frame Steel System (Seismic Testing)", $9,516, Mehrain-Naeim International, Inc.

June 2016 - May 2019, "RUI/Collaborative Research: Framework for Earthquake-Resilient Design of Tall Buildings", $159,995, National Science Foundation (NSF), project description.

Nov-Dec 2017, "Trial Evaluation of Buildings Using ATC-78 Analysis Methodology", $2,500, Degenkolb Engineers Los Angeles.

Contributions to Open System for Earthquake Engineering Simulation, OpenSees

Significant part of my research involves development of new analytical models for simulation of structural behavior under various hazards such as earthquakes, wind, etc. In the past several years, we have developed and implemented into computational platform OpenSees the following model elements and material models:

  • Efficient three-dimensional shear-flexure interaction element for non-planar RC walls, E-SFI-MVLEM-3D
  • Three-dimensional shear-flexure interaction element for non-planar RC walls, SFI-MVLEM-3D
  • Three-dimensional element for non-planar flexure-controlled RC walls, MVLEM-3D
  • Three-dimensional plane stress finite element model for reinforced concrete elements, quadRC
  • Element for shear-flexure modeling of RC walls, SFI_MVLEM
  • Element for flexural modeling of RC walls, MVLEM
  • 2D constitutive RC panel model, FSAM
  • Uniaxial material model for concrete, ConcreteCM
  • Uniaxial material model for steel, SteelMPF

For more details follow provided links to the OpenSees user documentation.

Publications

Journal Publications

Rojas-León, J. W. Wallace, S. A. Abdullah, and K. Kolozvari (2024), “New equations to estimate reinforced concrete wall shear strength derived from machine learning and statistical methods”, ACI Structural Journal, No. 121-S07, V. 121, 89-104, DOI.

Rojas-León, S. A. Abdullah, K. Kolozvari, and J. W. Wallace (2024), “A framework to set performance requirements for structural component models: application to reinforced concrete wall shear strength”, ACI Structural Journal, No. 121-S06, V. 121, 75-88, DOI.

Ji, L. Sun, S. Wang, K. Kolozvari (2023), “Seismic behavior and modeling of T-shaped reinforced concrete walls under high axial force ratios”, Earthquake Engineering & Structural Dynamics, 1-22, DOI.

K. Kolozvari, C. N. López, L. M. Massone (2023), “Efficient three-dimensional shear-flexure interaction model for reinforced concrete walls”, Engineering Structures, Vol. 294, 116700, DOI.

M. Unal, S. Abdullah, K. Kolozvari, J. Wallace, K. Kajiwara (2023), “Evaluation of ACI 318-19 provisions for special moment frames and special structural walls using data from the E-Defense 10-story tests”, Bulleting of Earthquake Engineering, S.I.: Ten-story RC Full-scale Buildings, DOI.

K. Kolozvari, S. Abdullah, J. Wallace, K. Kajiwara (2023), “Assessment of the 2015 full-scale ten-story RC test structure using ASCE/SEI 41”, Bulleting of Earthquake Engineering, S.I.: Ten-story RC Full-scale Buildings, DOI.

K. Kolozvari and V. Terzic (2023), “Methodology for developing practical recovery-based design requirements for buildings”, Engineering Structures, Vol. 274: 115102, DOI.

Q. Zhang, Y. Zhao, K. Kolozvari, L. Xu (2022), “Reliability analysis of reinforced concrete structure against progressive collapse”, Reliability Engineering and System Safety, DOI.

K. Rodsin, T. Mehmood, K. Kolozvari, A. Nawaz, Q. Samiullah, R. Parichatprecha (2022), “Experimental and numerical seismic assessment of non‑ductile reinforced concrete (RC) columns strengthened with glass fiber reinforced polymer (GFRP)”, Bulletin of Earthquake Engineering, DOI.

Y. Hori, Y. Suzuki, K. Kolozvari, O. Johansson, F. Naeim, M. Nakashima (2022), “A comparative study of seismic analysis, design, and collapse safety margins of tall buildings in the United States and Japan, Part I: Performance-based analysis and design”, Earthquake Spectra, DOI.

K. Kolozvari, Y. Hori, H. Yasumoto, Y. Suzuki, M. Nakashima, F. Naeim (2022), “A comparative study of seismic analysis, design, and collapse safety margins of tall buildings in the United States and Japan, Part II: Comparison of Seismic Capacity and Collapse Safety Margin”, Earthquake Spectra, DOI.

V. Terzic and K. Kolozvari (2022), “Probabilistic evaluation of post-earthquake functional recovery for a tall RC core wall building using F-Rec framework”, Engineering Structures, 253: 113785, DOI.

C. N. Lopez, L. M. Massone, K. Kolozvari (2021), “Validation of an efficient shear-flexure interaction model for planar reinforced concrete walls,” Engineering Structures, 243: 112680, DOI.

T. Isaković, M. Gams, A. Janevski, Z. Rakićević, A. Bogdanović, G. Jekić, K. Kolozvari, J. Wallace, M. Fischinger (2021). “Shake Table Test of RC Walls' Coupling Provided by Slabs”, Building Materials and Structures 64 (2021) 225-234, DOI.

K. Kolozvari, K. Kalbasi, K. Orakcal, J. W. Wallace (2021), “Three-Dimensional Shear-Flexure Interaction Model for Analysis of Non-Planar Reinforced Concrete Walls,” Journal of Building Engineering, 44: 102946, DOI.

K. Kolozvari, M. F. Gullu, K. Orakcal (2021), “Finite Element Modeling of Reinforced Concrete Walls under Uni- and Multi-Directional Loading using OpenSees,” Journal of Earthquake Engineering, DOI.

L. M. Massone, C. N. Lopez, K. Kolozvari (2021), “Formulation of an efficient shear-flexure interaction model for planar reinforced concrete walls,” Engineering Structures, 243: 112680, DOI.

K. Kolozvari, K. Kalbasi, K. Orakcal, J. W. Wallace (2021), “Three-Dimensional Model for Nonlinear Analysis of Slender Flanged Reinforced Concrete Walls,” Engineering Structures, 236: 112105, DOI.

K. Rodsin, T. Mehmood, K. Kolozvari, A. Nawaz (2020),  “Seismic Assessment of Non-Engineered Reinforced Concrete Columns in Low to Moderate Seismic Regions,” Bulletin of Earthquake Engineering, 18: 5941-5964, DOI.

Q. Zhang, Y. G. Zhao, K. Kolozvari, L. Xu (2020), “Simplified Model for Assessing Progressive Collapse Resistance of Reinforced Concrete Frames under an Interior Column Loss”, Engineering Structures, 215: 110688,  DOI.

K. Kolozvari, K. Kalbasi, K. Orakcal, J. W. Wallace (2019), “Shear-Flexure-Interaction Models for Planar and Flanged Reinforced Concrete Walls,” S.I.: Nonlinear Modeling of Reinforced Concrete Structural Walls, Bulletin of Earthquake Engineering, 1-27, DOI.

K. Kolozvari, L. Biscombe, F. Dashti, R. Dhakal, A. Gogus, F. M. Gullu, R. Henri, L. Lowes, L. Massone, K. Orakcal, F. Rojas, A. Shegay, J. W. Wallace (2019), “State-of-the Art in Microscopic Modeling of Isolated Planar Reinforced Concrete Structural Walls”, Engineering Structures, 194: 46-65, DOI.

M. F. Gullu, K. Orakcal, K. Kolozvari (2019), “The Fixed-Strut-Angle Finite Element (FSAFE) Model for Reinforced Concrete Structural Walls,” Bulletin of Earthquake Engineering, S.I.: Nonlinear Modeling of Reinforced Concrete Structural Walls, DOI.

V. Terzic, K. Kolozvari, and D. Saldana (2019), “Implications of Modeling Approaches on Seismic Performance of Low- and Mid-Rise Office and Hospital Shear Wall Buildings”, Engineering Structures, 189: 129-146, DOI.

T. Mehmood, K. Rodsin, P. Warnitchai, and K. Kolozvari (2018). “Investigating the Vulnerability of Non-ductile RC Columns in Moderate Seismic Regions to Gravity Load Collapse,” The Structural Design of Tall and Special Buildings Journal, 1-14, DOI.

K. Kolozvari, C. Arteta, M. Fischinger, S. Gavridou, M. Hube, T. Isakovic, L. Lowes, K. Orakcal, J Vasquez, and J. W. Wallace (2018), “Comparative Study on State-of-the-art Macroscopic Models for Planar Reinforced Concrete Walls”, ACI Structural Journal, 115 (6): 1637-1657, DOI.

K. Kolozvari, V. Terzic, R. Miller, D. Saldana (2018), “Assessment of Dynamic Behavior and Seismic Performance of a High-rise RC Coupled Wall Building”, Engineering Structures, 176: 606-620, DOI.

K. Kolozvari, K. Orakcal, J. W. Wallace (2018), “New OpenSees Models for Simulation of Flexural and  Shear-Flexural Interaction Behavior of Reinforced Concrete Walls and Columns”, Computers and Structures Journal, 196: 246-262, DOI.

Q. Zhang, L. Yaozhuang, K. Kolozvari (2018), “Numerical Modelling of Steel-Concrete Composite Structures”, Structural Concrete, 1-13, DOI.

K. Kolozvari and J. W. Wallace (2016), “Practical Nonlinear Modeling of Reinforced Concrete Structural Walls ”, Special Issue of ASCE Journal of Structural Engineering, 142 (12), DOI.

K. Kolozvari, K. Orakcal, J. W. Wallace (2015), “Modeling of Cyclic Shear-Flexure Interaction in Reinforced Concrete Structural Walls - Pert I: Theory", ASCE Journal of Structural Engineering, 141(5), DOI.

K. Kolozvari, T. A. Tran, K. Orakcal, J. W. Wallace (2015), “Modeling of Cyclic Shear-Flexure Interaction in Reinforced Concrete Structural Walls - Pert II: Experimental Validation", ASCE Journal of Structural Engineering, 141(5), DOI.

Conference Proceedings

M. Rojas-Leon, J.W. Wallace, S.A. Abdullah, K. Kolozvari (2023). Seismic Shear Design of RC Structural Walls. In: Ilki, A., Çavunt, D., Çavunt, Y.S. (eds) Building for the Future: Durable, Sustainable, Resilient. fib Symposium 2023. Lecture Notes in Civil Engineering, vol 350. Springer, Cham, DOI. 

L. M. Massone, C. Lopez, K. Kolozvari (2022). “An Efficient Shear-Flexure Model for RC Walls”, Proceedings of the 3rd European Conference on Earthquake Engineering, No. C001555.

V. Terzic and K. Kolozvari (2022). “Novel Framework for Resilience Assessment of Tall Buildings”, ASCE Lifeline Conference.

McFarlane, J. Piotrowski, K. Aswegan, J. D. Pozo, K. Kolozvari, J. Hooper (2021). “Phenomenological Nonlinear Modeling for Performance Based Design of High-Rise Shear Wall Buildings”, Proceedings of 2021 Los Angeles Tall Buildings Structural Design Council Annual Conference.

L. M. Massone, C. Lopez, K. Kolozvari (2021). “Efficient Shear-Flexure Interaction Model for Reinforced Concrete Walls”, Proceedings of the 17th World Conference in Earthquake Engineering, No. C001555.

C. Arteta, G. Araujo, J Piedrahita, C. Segura, K. Kolozvari, A. Ortiz (2021). “Quantifying the Uncertainty in Modeling of RC Walls”, Proceedings of the 17th World Conference in Earthquake Engineering, No. C002755.

T. Isakovic, M. Gams, Z. Rakicevic, A. Bogdanovic, G. Jekic, K. Kolozvari, J. Wallace, M. Fischinger (2021). “Large Scale Shake Table Test of Slab-Piers Interaction in RC Coupled Walls”, Proceedings of the 17th World Conference in Earthquake Engineering, No. C001500.

V. Terzic and K. Kolozvari (2021). “Novel Framework for Resilience Assessment of Tall Buildings”, ASCE Lifeline Conference.

V. Terzic, K. Kolozvari, and F. Naeim (2021). “Towards Resilient Seismic Design of Structures”, 9th Turkish Conference on Earthquake Engineering, Turkey, Keynote Paper.

N. Bilgin, M. F. Güllü, K. Kolozvari, K. Orakçal (2021). “Behavior and Modeling Reinforced Concrete Structural Walls”, 9th Turkish Conference on Earthquake Engineering, Turkey.

V. Terzic and K. Kolozvari (2020). ”Evaluation of Post-Earthquake Functional Recovery for a 42-Story Building Located in Los Angeles”, Proceedings of 2020 Los Angeles Tall Buildings Structural Design Council Annual Conference.

K. Kolozvari, D. Naish, M. Mehrain, F. Naeim (2019). “WrapAround Frame for Seismic Retrofit of Soft Story Buildings”, 2019 SEAOC Convention Proceedings, Squaw Creek, CA, ID 35.

K. Kalbasi, G. Hange, D. Zepeda, K. Kolozvari, M. Mehrain, F. Naeim (2019). “Optimum Strength and Stiffness of Frames used for Retrofit of Wood “Soft Story” Buildings in the Los Angeles Area”, 2019 SEAOC Convention Proceedings, Squaw Creek, CA, ID 43.

V. Terzic, K. Kolozvari, D. Saldana (2018), “Performance Assessment of Low- and Mid-Rise Office and Hospital RC Shear Wall Buildings", 2018 SEAOSC Convention, Palm Springs, CA, ID 004.

K. Kolozvari, N. Rea, F. Gullu, K. Orakcal (2018), “Three-Dimensional Nonlinear Modeling of RC Walls under Uniaxial and Biaxial Loading", Proceedings of 11th National Conference in Earthquake Engineering, Los Angeles, CA, ID 811.

K. Kolozvavri, V. Terzic, R. Miller, D. Saldana (2018), “Seismic Performance of Code- and Performance-Based High-Rise Coupled Wall Buildings", Proceedings of 11th National Conference in Earthquake Engineering, Los Angeles, CA, ID 749.

V. Terzic, K. Kolozvari, D. Saldana (2018), “The Effect of Increased Strength and Stiffness on Seismic Performance of RC Shear Wall Buildings", Proceedings of 11th National Conference in Earthquake Engineering, Los Angeles, CA, ID 752.

N. Tauberg, J. W. Wallace, K. Kolozvari (2018), “Collapse Assessment of Ductile Coupled Wall Prototypes", Proceedings of 11th National Conference in Earthquake Engineering, Los Angeles, CA, ID 1169.

K. Orakcal, F. Gullu, K. Kolozvari (2018), “Nonlinear Finite Element Modeling of Low-Rise Shear-Controlled Structural Walls", Proceedings of 16th European Conference in Earthquake Engineering, Thessaloniki, Greece, ID 11145.

K. Kolozvari, R. Miller, K. Orakcal (2017), “Finite Element Modeling of Reinforced Concrete Structural Walls for Performance-Based Seismic Design", Proceedings of 11th International Conference on Earthquake Resistant Structures, Alicante, Spain, WIT Transactions on the Built Environment 172: 35-46.

K. Kolozvari, V. Terzic, D. Saldana (2017), “Implications of Modeling Assumptions on the Loss Estimation for Shear Wall Buildings", Proceedings of 2017 ASCE Structures Congress, DOI.

K. Kolozvari, K. Orakcal, J. W. Wallace (2017), “New OpenSees Models for Simulation of Nonlinear Flexural and Shear-Flexural Interaction Behavior of Reinforced Concrete Walls and Columns", Proceedings of 16th World Conference in Earthquake Engineering, Santiago, Chile.

K. Kolozvari, G. Piatos, K. Beyer (2017), “Practical Nonlinear Modeling of U-shaped Reinforced Concrete Walls under Bi-direction Loading", Proceedings of 16th World Conference in Earthquake Engineering, Santiago, Chile.

K. Kolozvari, K. Orakcal, J. W. Wallace (2014), “Cyclic Shear-Flexure Interaction in Reinforced Concrete Structural Walls - Modeling and Validation", Proceedings of 10th National Conference on Earthquake Engineering, Anchorage, AK, USA.

K. Kolozvari, T. A. Tran, K. Orakcal, J. W. Wallace (2012), “Modeling of Cyclic Shear-Flexure Interaction in Reinforced Concrete Structural Walls", Proceedings of 15th World Conference on Earthquake Engineering, Lisbon, Portugal.

Technical Reports

Federal Emergency Management Administration (working group member) (2022), “Benchmarking Evaluation Methodologies for Existing Reinforced Concrete Buildings”, Report #: NIST GCR 22-917-50, DOI.

N. A. Tauberg, K. Kolozvari, J. W. Wallace (2019), “Ductile Reinforced Concrete Coupled Walls: FEMA P695 Study”, UCLA SEELR 2019/01, University of California, Los Angeles, Sponsors: Charles Pankow Foundation & ACI Foundation.

Federal Emergency Management Administration (working group member) (2018), “Assessing Seismic Performance of Buildings with Configurational Irregularities”, FEMA P-2012.

K. Kolozvari and D. Naish (2018), “Cyclic Laboratory Tests of WrapAround Frame”, California State University, Fullerton, Sponsor: Mehrain Naeim International, Inc.

K. Kolozvari, K. Orakcal, J. W. Wallace (2015), “Shear-Flexure Interaction Modeling for Reinforced Concrete Structural Walls and Columns under Reversed Cyclic Loading", Pacific Earthquake Engineering Research Center, PEER Report No. 2015/12, DOI.

Recognition

S.B. Barnes Research Award (2019), Structural Engineering Association of Southern California Outstanding Reviewer (2017), Engineering Structures Journal