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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.

Dr. Triantafyllou is also a member of the Centre for Structural Engineering & Informatics Research Group.

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
  • KAKOURIS, E. G. and TRIANTAFYLLOU, S. P., 2017. Material point method for crack propagation in anisotropic media: a phase field approach: Archive of Applied Mechanics Archive of Applied Mechanics. 1-30
  • EGGER, A. W., CHATZI, E. N. and TRIANTAFYLLOU, S. P., 2017. An enhanced scaled boundary finite element method for linear elastic fracture: Archive of Applied Mechanics Archive of Applied Mechanics. 1-40
  • KAKOURIS, E. G. and TRIANTAFYLLOU, S. P., 2017. Phase-field material point method for brittle fracture International Journal for Numerical Methods in Engineering. n/a-n/a
  • EGGER, A. W., CHATZI, E. N. and TRIANTAFYLLOU, S. P., 2017. An enhanced scaled boundary finite element method for linear elastic fracture: Archive of Applied Mechanics Archive of Applied Mechanics. 87(10), 1667-1706
  • 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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