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Image of Savvas Triantafyllou

Savvas Triantafyllou

Assistant Professor and First Year Senior Tutor, Faculty of Engineering

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Biography

Savvas is a Structural Engineer specializing in Computational Mechanics. Before coming to Nottingham, he was a Lecturer at Brunel University London (2013-2014) and previously a post-doctoral researcher at the Swiss Federal Institute of Technology (ETH) at Zurich (2012-2013). He holds a PhD in Civil Engineering (2011), an Msc in Structural Analysis and Design (2006) and a Diploma in Civil Engineering (2004) from the National Technical University of Athens, Greece.

Expertise Summary

Dr. Triantafyllou's primary research interest is in the nonlinear static and dynamic behaviour of structures and materials. He focuses on macro-modelling and micro-modelling computational methods to simulate the nonlinear response of large scale structures using smooth hysteretic models. Within this framework he has developed a family of hysteretic one-dimensional macro-elements and a generic method for the derivation of hysteretic finite elements.

Dr. Triantafyllou is currently developing a hysteretic multiscale finite element framework, capable of effectively simulating the nonlinear response of composite materials.

Teaching Summary

H22NAS - Nonlinear Analysis of Structures

H24SPS - Plates and Shells

Savvas is also running the B3 - Introduction to Matlab workshop for First year Civil Engineering students

Research Summary

Co-Ι: "MARQUESS: Multiscale Analysis of AiRframe Structures and Quantification of UncErtaintieS System", Clean-Sky 2 Framework, effective 01/06/2017-31/05/2020. Total Budget: £700.00 "SAFE-FLY:… read more

Selected Publications

Current Research

  • Co-Ι: "MARQUESS: Multiscale Analysis of AiRframe Structures and Quantification of UncErtaintieS System", Clean-Sky 2 Framework, effective 01/06/2017-31/05/2020. Total Budget: £700.00
  • "SAFE-FLY: Damage modelling and online detection in aerospace composite structures", Marie Skłodowska-Curie Innovative Training Network, effective 01/02/2017-31/01/2021. Total Budget: £800.000. Own share: £150.000.
  • "A multiscale computational framework for the prediction of hydraulic fracture induced vibrations", Dean of Engineering Award, Faculty of Engineering, The University of Nottingham, effective 01/11/2015-31/07/2017. Budget: £35000.
  • "Development of combined enriched elements and continuum damage mechanics models for composites", effective 01/10/2015-30/09/2018, in collaboration with NSIRC. Total Budget: £72000.
  • "Hybrid multiscale methods for nonlinear dynamic processes", University of Nottingham Start-up Grant, effective 01/03/15-28/02/18. Total Budget: £46000.
  • "Retrofitting of masonry arches with textile reinforced mortars", effective 01/08/2015-31/07/2018. University of Nottingham Dean of Engineering prize. Total Budget: £42000.
  • "Strengthening of structures with advanced composite materials" funded under the Since without Borders program, CNPq, The National Council of Scientific and Technological Development, effective 01/08/2015-31/07/2018. Total Budget: £51,340.
  • "Multiscale modelling for dynamic crack propagation in porous media: A Multiphysics approach", International Collaboration Fund, The University of Nottingham, effective 01/12/2015-30/11/2018. Budget: £5000.
  • "A Multiscale Hysteretic XFEM Scheme for the Analysis of Composite Structures", Swiss National Science Foundation (SNSF) Research Grant, Project # 200021_153379, effective 01/04/2014-31/03/2017, in collaboration with Prof. Eleni Chatzi, Chair of Structural Mechanics, ETH, Zurich.

Past Research

  • "Hysteretic Multi/Scale Modelling for the Reinforcing of Masonry Structures", Swiss National Science Foundation (SNSF) Research Grant, Project #200021_146996, effective 01/04/2013-31/03/2015, in collaboration with Prof. E. N. Chatzi, Chair of Structural Mechanics, ETH, Zurich.
  • CHATZIS, M., CHATZI, E. N. and TRIANTAFYLLOU, S. P., 2017. A Discontinuous Extended Kalman Filter for non-smooth dynamic problems Mechanical Systems and Signal Processing.
  • SOLDATOS, D. and TRIANTAFYLLOU, S. P., 2017. On the quasi-yield surface concept in plasticity theory: ZAMM Zeitschrift fur Angewandte Mathematik und Mechanik ZAMM Zeitschrift fur Angewandte Mathematik und Mechanik.
  • SOLDATOS, D., TRIANTAFYLLOU, S. P. and PANOSKALTSIS, V. P., 2017. Thermomechanical couplings in shape memory alloy materials: Continuum Mechanics and Thermodynamics Continuum Mechanics and Thermodynamics. 1-30
  • TRIANTAFYLLOU, S. P. and CHATZI, E. N., 2016. A hysteretic multiscale formulation for validating computational models of heterogeneous structures: Journal of Strain Analysis for Engineering Design Journal of Strain Analysis for Engineering Design. 51(1), 46-62
  • SOLDATOS, D. and TRIANTAFYLLOU, S. P., 2016. Logarithmic Spin, Logarithmic Rate and Material Frame-Indifferent Generalized Plasticity: International Journal of Applied Mechanics International Journal of Applied Mechanics. 8(5),
  • CHATZIS, MN, CHATZI, E and TRIANTAFYLLOU, SP, 2016. A discontinuous class of filtering methods for the identification of non-smooth dynamical systems. In: Life-Cycle of Engineering Systems: Emphasis on Sustainable Civil Infrastructure CRC Press. 60
  • A. G. EGGER, S. P. TRIANTAFYLLOU and E. N. CHATZI, 2016. The scaled boundary finite element method for the efficient modelling of linear elastic fracture In: Proc., 9th International Conference on Fracture Mechanics of Concrete and Concrete Structures.
  • M. N. CHATZIS, E. N. CHATZI and S. P. TRIANTAFYLLOU, 2016. Identification of non-smooth dynamics for assessing structural performance In: 11th HSTAM International Congress on Mechanics, May 27-30, 2016, Athens, Greece..
  • PANOSKALTSIS, V. P., SOLDATOS, D. and TRIANTAFYLLOU, S. P., 2015. Invariance in non-isothermal generalized plasticity Acta Mechanica.
  • TRIANTAFYLLOU, S.P. and CHATZI, E.N., 2015. Towards a multiscale scheme for nonlinear dynamic analysis of masonry structures with damage. In: PSYCHARIS, I. N., PANTAZOPOULOU, S. J. and PAPADRAKAKIS, M., eds., Seismic Assessment, Behavior and Retrofit of Heritage Buildings and Monuments 37. Springer, Berlin. 479
  • M. N. CHATZIS, E. N. CHATZI and S. P. TRIANTAFYLLOU, 2015. An adaptive online identification scheme for a phenomenological hysteretic law In: Proceedings of the Engineering Mechanics Institute Conference, June 16-19, Stanford, California.
  • S. P. TRIANTAFYLLOU, 2015. Implementing continuum damage-healing mechanics within a multiscale finite element setting In: XIII International Conference on Computational Plasticity, COMPLAS XIII.
  • S. P. TRIANTAFYLLOU and M. N. CHATZIS, 2015. A new damage-healing smooth hysteretic formulation for the modeling of self-healing materials In: 8th GRACM International Congress on Computational Mechanics.
  • D. SOLDATOS, S. P. TRIANTAFYLLOU and E. N. CHATZI, 2015. On the constitutive modeling of dual-phase steels at finite strains - a generalized plasticity based approach In: Forming Technology Forum 2015, June 29 & 30, 2015, Zurich, Switzerland.
  • PANOSKALTSIS, V. P., SOLDATOS, D. and TRIANTAFYLLOU, S. P., 2014. On phase transformations in shape memory alloy materials and large deformation generalized plasticity: Continuum Mechanics and Thermodynamics Continuum Mechanics and Thermodynamics. 1-21
  • TRIANTAFYLLOU, S. P. and KOUMOUSIS, V. K., 2014. Hysteretic Finite Elements for the Nonlinear Static and Dynamic Analysis of Structures: Journal of Engineering Mechanics Journal of Engineering Mechanics.
  • TRIANTAFYLLOU, S. P. and CHATZI, E. N., 2014. Risk Analysis of Composite Structures by Subset Estimation Using the Hysteretic Multiscale Finite Element Method In: Second International Conference on Vulnerability and Risk Analysis and Management (ICVRAM) and the Sixth International Symposium on Uncertainty, Modeling, and Analysis (ISUMA), Liverpool, UK, 13-16 July.
  • PANOSKALTSIS, V. P., SOLDATOS, D. and TRIANTAFYLLOU, S. P., 2014. Erratum to: Invariance in non-isothermal generalized plasticity: Acta Mechanica Acta Mechanica.
  • TRIANTAFYLLOU, S. P. and KOUMOUSIS, V. K., 2013. Micro and macroscale hysteretic modeling with nonlinear kinematic hardening In: 10th HSTAM International Congress on Mechanics, Chania, Crete, 25-27 May.
  • TRIANTAFYLLOU, S. P. and CHATZI, E. N., 2013. A three dimensional Multiscale formulation for the nonlinear dynamic analysis of masonry structures In: 4th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering, Kos Island Greece, 12-14 June.
  • TRIANTAFYLLOU, S. P. and CHATZI, E. N., 2013. A novel hysteretic multiscale finite element method for nonlinear dynamic analysis of heterogenous structures In: 11th International Conference on Structural Safety and Reliability, ICOSSAR 2013, New York, NY, United States, 16-20 June. 979-986
  • TRIANTAFYLLOU, S. P. and KOUMOUSIS, V. K., 2012. An hysteretic quadrilateral plane stress element: Archive of Applied Mechanics Archive of Applied Mechanics. 82(10-11), 1675-1687
  • TRIANTAFYLLOU, S. P. and KOUMOUSIS, V. K., 2012. Bouc-Wen Type Hysteretic Plane Stress Element: Journal of Engineering Mechanics Journal of Engineering Mechanics. 138(3), 235-246
  • PANOSKALTSIS, V. P., SOLDATOS, D. and TRIANTAFYLLOU, S. P., 2011. The concept of physical metric in rate-independent generalized plasticity: Acta Mechanica Acta Mechanica. 221(1-2), 49-64
  • PANOSKALTSIS, V. P., SOLDATOS, D. and TRIANTAFYLLOU, S. P., 2011. Generalized plasticity theory for phase transformations: Procedia Engineering Procedia Engineering. 10, 3104-3108
  • TRIANTAFYLLOU, S. and KOUMOUSIS, V., 2011. Small and large displacement dynamic analysis of frame structures based on hysteretic beam elements: Journal of Engineering Mechanics Journal of Engineering Mechanics. 138(1), 36-49
  • TRIANTAFYLLOU, S. P. and KOUMOUSIS, V. K., 2011. An inelastic Timoshenko beam element with axial-shear-flexural interaction: Computational Mechanics Computational Mechanics. 48(6), 713-727
  • TRIANTAFYLLOU, S. P. and KOUMOUSIS, V. K., 2011. A three-dimensional hysteretic Timoshenko beam element with torsional warping In: 7th Gracm International Congress on Computational Mechanics, Athens, Greece, 30 June - 2 July.
  • TRIANTAFYLLOU, S. P. and KOUMOUSIS, V. K., 2011. A hysteretic quadrilateral plane stress element In: 7th Gracm International Congress on Computational Mechanics, Athens, Greece, 30 June - 2 July.
  • PANOSKALTSIS, V. P., SOLDATOS, D. and TRIANTAFYLLOU, S. P., 2011. Generalized Plasticity Theory for Phase Transformations In: 11th International Conference on the Mechanical Behavior of Materials (ICM11), Milano, Italy 5-9 June.
  • PANOSKALTSIS, V. P., SOLDATOS, D. and TRIANTAFYLLOU, S. P., 2011. A New theory for shape memory alloy materials under general states of deformation and temperature conditions In: 7th Gracm International Congress on Computational Mechanics, Athens, Greece, 30 June - 2 July.
  • PANOSKALTSIS, V. P., SOLDATOS, D. and TRIANTAFYLLOU, S. P., 2011. A geometric theory of plasticity In: Proceedings of the 4th International Conference on Computational Methods for Coupled Problems in Science and Engineering, COUPLED PROBLEMS 2011, Kos Island, Greece, 20-22 June. 506-520
  • TRIANTAFYLLOU, S. P. and KOUMOUSIS, V. K., 2010. Incorporating Smooth Hysteretic models in Finite Elements In: 9th HSTAM International Congress on Mechanics, Limassol, Cyprus, July 12-14.
  • TRIANTAFYLLOU, S. P. and KOUMOUSIS, V. K., 2010. A locking free Timoshenko beam element for the nonlinear dynamic analysis of structures In: 9th HSTAM International Congress on Mechanics, Limassol, Cyprus, July 12-14.
  • CHATZIS, M. N., TRIANTAFYLLOU, S. P. and KOUMOUSIS, V. K., 2010. Using analytical sensitivity analysis in box girder design In: 9th HSTAM International Congress on Mechanics, Limassol, Cyprus, July 12-14.
  • TRIANTAFYLLOU, S. P. and KOUMOUSIS, V. K., 2009. A novel seismic isolation device for museum artifacts In: CF Nonlinear Dynamics, Stability, Identification and Control of Systems and Structures, Rome, Italy, September 21-25.
  • TRIANTAFYLLOU, S. P. and KOUMOUSIS, V. K., 2009. A Bouc-Wen Type Hysteretic Plane Stress Element In: International Conference on Structural Engineering Dynamics.
  • TRIANTAFYLLOU, S. P. and KOUMOUSIS, V. K., 2009. A new triangular element for the analysis of plane stress / plane strain plasticity problems In: Computational Plasticity X - Fundamentals and Applications.
  • PANOSKALTSIS, V. P., SOLDATOS, D. and TRIANTAFYLLOU, S. P., 2009. A Metric Theory of Large Deformation Generalized Plasticity In: The 2009 Joint ASCE-ASME-SES Conference on Mechanics and Materials, Blacksburg, Virginia,June 24-27.
  • PANOSKALTSIS, V. P., SOLDATOS, D. and TRIANTAFYLLOU, S. P., 2009. A new model of large deformation generalized plasticity In: 10th International Conference on Computational Plasticity, COMPLAS X, Barcelona, Spain, 2- 4 September.
  • TRIANTAFYLLOU, S. P. and KOUMOUSIS, V. K., 2008. Form Finding and Structural Optimization of Tension Structures Using MOGAs In: The 9th International Conference on Computational Structures Technology.
  • TRIANTAFYLLOU, S. P. and KOUMOUSIS, V. K., 2008. A Rod Element Formulation for the Nonlinear Dynamic Analysis of Trusses In: 6th National Conference on Steel Structures, Ioannina, Greece, 2-4 October.
  • TRIANTAFYLLOU, S. P. and KOUMOUSIS, V. K., 2008. A Beam Element Formulation for the Nonlinear Dynamic Analysis of Structures using the Bouc-Wen Hysteretic Rule In: 6th GRACM, International Congress on Computational Mechanics.
  • CHATZIS, E. N., TRIANTAFYLLOU, S. P. and KOUMOUSIS, V. K., 2008. A beam element formulation for the non-uniform Torsion and Distortion of thin walled closed sections In: 6th National Conference on Steel Structures, Ioannina, Greece, 2-4 October.
  • TRIANTAFYLLOU, S. P. and KOUMOUSIS, V. K., 2007. Form-Finding and Structural Optimization of cable networks using genetic algorithms In: 8th HSTAM, International Congress on Mechanics.
  • KOUMOUSIS, V. K., CHATZI, E. N. and TRIANTAFYLLOU, S. P., 2006. Plastique – A computer program for 3D inelastic analysis of Multi Storey Buildings In: Proceedings of an International Conference on Advances in Engineering Structures, Mechanics & Construction, Ontario, Canada, 14-17 May.
  • KOUMOUSIS, V. K., CHATZI, E. N. and TRIANTAFILLOU, S. P., 2006. ”Plastique“ — A Computer Program For 3D Inelastic Analysis Of Multi-Storey Buildings. In: PANDEY, M., XIE, WEI-CHAU and XU, LEI, eds., Advances in Engineering Structures, Mechanics & Construction 140. Springer Netherlands. 367-378
  • CHATZI, E. N., TRIANTAFYLLOU, S. P. and KOUMOUSIS, V. K., 2005. A computer program for 3D inelastic analysis of R/C structures In: 5th GRACM International Congress on Computational Mechanics, Limassol, Cyprus, 29 June - 1 July.
  • KOUMOUSIS, V. K., CHATZI, E. N. and TRIANTAFYLLOU, S. P., 2005. “Plastique” – a computer program for the inelastic analysis of semi – rigid steel structures In: EEME 5th National Conference on Steel Structures, Ksanthi, 29 September-2 October.
  • TRIANTAFYLLOU, S. P. and KOUMOUSIS, V. K., A Bouc-Wen type hysteretic model with nonlinear kinematic hardening In: EURODYN 2011 - The 8th International Conference on Structural Dynamics, Leuven, Belgium, 4-6 July. 3273-3280
  • E. G. KAKOURIS and S. P. TRIANTAFYLLOU, Phase-Field Material Point Method for Brittle Fracture In: 11th HSTAM International Congress on Mechanics, May 27-30, Athens, Greece.

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