Curriculum Vitae

Please find here a detailed C.V.

The quest for knowledge is an everlasting passion of mine.

Professional Experience

Jr. Project Manager

Responsible for the repair, maintenance, and licensing of all building infrastructure
Health Fund of NBG Personnel - Div. of Technical Services
Athens, Greece
Full-time, May 2018 - Today

Educator

Taught the following three (3) courses: Steel Structures, Prefabricated Structures (Α & Β)
Hellenic Airforce, School of Non-Commissioned Officers - Infrastructure Maintainers
Athens, Greece
Part-Time, Acad. Year 2017 - 2018

Employee

Computer and hand calculation of various models (structural and geotechnical), of concrete and steel elements and/or of structures/substructures:
- Bearing capacity certification of trapezoidal sections according to EC3
- Structural modelling and concrete reinforcement calculations of a sports centre, including earthquake resistance design
- Design of a shear flow connection pattern for the strengthening of a prestressed concrete slab using resin-fixable dowels
- Dimensioning of a special excavation support system (Berlin-type wall supported by retaining steel beams/girders and concrete wall elements functioning as buttresses; foundation improvement for frictional resistance using steel-core concrete micro-piles)
WMM Ingenieure A.G.
Basel, Switzerland
Full-time, Sep. 2015 - Mar. 2016

Teaching Assistant

Provided assistance for the following four (4) courses:
- Undergraduate :

  1. Statics I (Analysis of Statically Determinate Frames)
  2. Statics II (Analysis of Statically Indeterminate Frames)
  3. Statics V - Part I (Plastic Limit Analysis of Frames)
- Postgraduate :
  1. Course A2 (Advanced Plastic Analysis of Frames)
NTUA, School of Civil Engineering - Structural Department
Athens, Greece
Part-time, Oct. 2008 - May 2012

Civil Servant

Participation in the process of preparing and hosting auctions for public works
Ministry of Rural Development & Foods, Division of Design & Constructions
Athens, Greece
Full-time, Nov. 2006 - Jul. 2007

Freelancer

Services: Operation licenses for shops, architectural and topographical designs, site inspections, technical consulting and supervisor engineer services (small to medium projects)
Technical Office (sole-trader)
Athens, Greece
Part-time, May 2006 - Jun. 2015

Education

(2019) Ph.D., Institute for Structural Analysis & Antiseismic Research, School of Civil Engineering, N.T.U.A.

Thesis: Novel mathematical programming procedures for the force-based inelastic analysis of three-dimensional framed structures

(2008) M.Sc., "Analysis & Design of Earthquake Resistant Structures" (A.D.S./A.D.E.R.S.), N.T.U.A.

Dissertation: Implementation of the force method in the elastoplastic analysis of frames using mathematical (quadratic) programming

(2005) Diploma, School of Civil Engineering, N.T.U.A.

Thesis: A computer program for determining the collapse load of cable-tied frames, using the Simplex method

Affiliations & Memberships

Member of the Technical Chamber of Greece (T.E.E.), Member No.106636

Computer Skills

Operating Systems:
MS-DOS (v.6.22), Windows (v.9x,XP,7), Linux (SuSE v.7.2, Ubuntu v.9.10), MacOS (v.10.15)
Programming Languages:
- Strongly Typed: ForTran (77,90/95,2003/2008), C/C++ (C90,C11), Visual Basic (v.6.0 & V.B.A.)
- Weakly Typed: Mathematica (v.8), Matlab (R2010a)
- Web : HTML(v.4.01), XHTML (v.1.0) & CSS (v.2.1)
Office Suites
Microsoft Office (v.2003,2007,2019) - Word, Excel, PowerPoint, Outlook, OneNote
C.A.D.
AutoCAD (v.2002,2007,2011,2020), CAD Ware (v.8.5,9.5), Rhinoceros (v.6)
F.E.M.
ABAQUS CAE (v.6.14), Axis VM (v.12), SAP 2000 (v.14.2.3), LISA (v.6.2.3)
Structural
Cubus: Cedrus, Statik, Fagus, Pyrus (v.5/v.6)
PaTh: Dynamis (v.0.1A)
Geotechnical
Cubus: Larix (v.5)
Optimization
Mosek (v.7.1.0.49)
Image Editing
GIMP (v.2.6.8)

Languages

English - Cambridge Proficiency [C2]
German - Göethe Institut Zertifikat [B2]
Greek - Mother Language [C2]

Seminars

"High Performance Computing Academy" (in English)

Organizers : Centre for Scientific Computing, Univ. of Cambridge
Location : Centre for Mathematical Sciences, Cambridge, UK, Sep. 2-13, 2019

"Course on Earthquake - Training by Example (AxisVM)" (in German)

Organizers : Ingware AG Bau-Informatik
Location : Erlenbach, Zurich, Jan. 28, 2016

"From ΚΤΣ-97 to ΚΤΣ-2013" (From Old to New Greek Standards for Concrete Technology)

Organizers : I.E.K.E.M. T.E.E. (http://www.iekemtee.gr/)
Location : I.E.K.E.M. T.E.E. Building, Athens, Nov. 25 - Dec. 02, 2013

"Introduction to MATLΑB & Programming Techniques"

Organizers : N.O.C. N.T.U.A. & Mentor Hellas L.T.D.
Location : P.C. Lab B, Central Computer Building, NTUA, Zografou, Mar. 22-23, 2010

"Success Drivers in Construction Project Management"

Organizers : T.E.E. & A.S.C.E. (Hellenic Group) & P.M.I. (Greece Chapter)
Location : Athens Chamber of Commerce & Industry, Jan. 21, 2010

"Organic, Molecular and Nanostructured Electronics - Physics & Technology [6.17s]"

Organizer : M.I.T., Professional Institute
Location : M.I.T. Campus, Jun. 9-13, 2008

Conferences

"A Force-Based Formulation for the Analysis of 3 Dimensional Inelastic Structural Frames"

T.N. Patsios & K.V. Spiliopoulos Proc. ECCOMAS VII, (Crete, Greece, 5-10 Jun. 2016)

"A Force-Based Formulation for the Analysis of Frames with Non-Holonomic Hardening Plastic Hinges"

T.N. Patsios & K.V. Spiliopoulos, WCCM XI - ECCM V - ECFD VI, (Barcelona, Spain, 20-25 Jul. 2014)

"A Force-Based Formulation for the 2 nd Order Elastoplastic Analysis of Frames"

T.N. Patsios & K.V. Spiliopoulos, Proc. 2 nd ECCOMAS Young Investigators Conference, (Bordeaux, France, 26 Sep. 2013)

"Pushover Analysis By The Force Method"

K.V. Spiliopoulos & T.N. Patsios, Proc. 3 rd P.C.E.E.E.S., Paper No. 2104, (Athens, Greece, 5-8 Nov. 2008)

"Numerical Implementation of the Force Method in the Elastoplastic Analysis of Frames"

K.V. Spiliopoulos & T.N. Patsios, Proc. 8th WCCM & 5th IACM/ECCOMAS Conference, (Venice, Italy, 30 Jun. - 4 Jul. 2008)

"Limit Analysis of Cable Tied Structures"

K.V. Spiliopoulos & T.N. Patsios, Proc. 3 rd European Conference on Computational Mechanics, (Lisbon, Portugal, 5-8 Jun. 2006)

Refereed Journal Publications

"A Force-Based Mathematical Programming Method For The Incremental Analysis Of 3D Frames With Non-Holonomic Hardening Plastic Hinges”

T.N. Patsios & K.V. Spiliopoulos, Journal of Computers & Structures (Volume 208, October 2018, Pages 51-74)

"An Efficient Mathematical Programming Method for the Elastoplastic Analysis of Frames"

K.V. Spiliopoulos & T.N. Patsios, Journal of Engineering Structures, Elsevier (Volume 32, Issue 5, 2010, Pages 1199-1214)

"A Quick Estimate of the Strength of Uniaxially Tied Framed Structures"

K.V. Spiliopoulos & T.N. Patsios, Journal of Constructional Steel Research, Elsevier (Volume 65, Issues 8-9, 2009, Pages 1763-1775)

Book Chapters

"Numerical Analysis of Nonholonomic Elastoplastic Frames by Mathematical Programming"

K.V. Spiliopoulos & T.N. Patsios, Limit State of Materials and Structures, Direct Methods 2, 2013, Pages 129-144, Springer, Netherlands, ISBN (on-line): 978-94-007-5425-6

Scholarships

GAPSTI (Gianna Angelopoulos Programme for Science Technology and Innovation)
Scholarship for participation in a High Performance Computing Seminar
(Centre for Mathematical Studies, University of Cambridge, 2-13 September, 2019)
IACM (International Association of Computational Mechanics
Scholarship (1 out of 1 in total provided to Greek Scholars) for participation in the WCCMECCM-ECFD 2014 Conference
(Barcelona, Spain, 20-25 July, 2014, Participant No.3991)
ESKAS
Scholarship (1 out of 320 in total, 11 of which provided to Greek Scholars) from the Swiss Government for conducting research in cooperation with Assoc. Prof. Dr. E. Chatzi, Chair of Structural Mechanics
(IBK, ETH Zurich, 15/1 - 15/10 2013, Dossier No.2012.0509)
CIMNE-IACM/ECCOMAS
Scholarship (1 out of 39 in total) for participation in the 8 th WCCM - 5 th ECCOMAS
(Venice, Italy, 30/6-4/7 2008, Participant No.1941)

Research Projects

Support Program for Basic Research (Π.Ε.Β.Ε.)
- Project Title: "Development of a numerical procedure for inelastic analysis of framed structures with material softening and/or geometric nonlinearities, based on the force method; applications in civil engineering"
- Funding: N.T.U.A., Account for Utilization of Research Grants (Ε.Λ.Κ.Ε.)
- Coordinator: Assoc. Prof. K.V. Spiliopoulos, N.T.U.A.
- Job Position: Research Associate, Institute for Structural Analysis & Anti-Seismic Research, Department of Structural Engineering, School of Civil Engineering, N.T.U.A.
Research Program "AD.V.AN.C.E." (Advanced Virtual Analysis of Crash Environments)
Polymers Lab, Laboratory for Testing Materials, Sect. Mechanics, N.T.U.A.
- Funding: European Union (G3RD - CT - 2000 - 00276)
- In Cooperation with: MECALOG, Renault, Daimler Chrysler, Politecnico di Torino, TNO, TRW, CIDAUT, CADFEM, Warsaw University of Technology, Regienov
- Job Position: Research Assistant, under the supervision of Assistant Professor Vassilios Kefalas, in direct cooperation with MECALOG and Renault.
- Objective: Experimental work & material modeling on polypropylene foams, for improving the passive safety technology of cars.

Lecture Notes

Lecture Notes & Exercises on Steel Structures

Hellenic Airforce, School of Non-Commissioned Officers - Infrastructure Maintainers, Acad. Year 2017-2018

Lecture Notes & Exercises on Prefabricated Structures

Hellenic Airforce, School of Non-Commissioned Officers - Infrastructure Maintainers, Acad. Year 2017-2018

Lecture Notes & Exercises on Structural Analysis (Courses I,II,V)

National Technical University of Athens, School of Civil Engineering, Acad. Years 2008-2009, 2009-2010, 2010-2011, 2011-2012

Military Tenure

Rifleman & Civil Engineer - Corporate of Engineers (Michanikon) of the Hellenic Army (2012 Γ' Training Class, 14 May 2012 - 14 January 2013)

Portfolio

Below you will find a list of selected projects in which I have been invovled; either exclusively, or in collaboration with other colleagues, or as an employee. Please note that I have included only these projects for which I have consent from the clients/employers regarding their privacy. (To be uploaded soon!)

Publications

Please find here a selection of my publications and authorships; the list includes peer-reviewed journal articles, conference proceedings, and a book chapter.

A Force-Based Mathematical Programming Method For The Incremental Analysis Of 3D Frames With Non-Holonomic Hardening Plastic Hinges

In this work, a fully automated, step-by-step, 1st order matrix force method is developed for the analysis of planar (2D) and spatial (3D) structural frames made of elastic-hardening plastic material. Plasticity (ideal and hardening) is modelled using plastic hinges of zero-length. The proposed automation techniques utilize Lagrange multipliers to model all forms of discontinuities in a simple and efficient way, within the framework of mathematical programming: internal discontinuities (e.g. articulations) as well as element eccentricities are taken into account. The problem may be solved using any quadratic/non-linear optimization algorithm with linear constraints; the redundant forces/moments serve as the primary unknowns. A load-controlled numerical strategy that is suitable for any predefined loading scenario analysis is proposed; its efficiency is demonstrated via a set of examples which are compared with existing results from the literature or output from commercial software based on the equivalent direct stiffness method. Read More

Scientific Journal Article
by T.N.Patsios & K.V.Spiliopoulos

A Force-Based Formulation for the Analysis of 3-Dimensional Inelastic Structural Frames

A force-based formulation for the step-by-step non-linear (elastic-plastic) analysis of three-dimensional (3D) structural frames is presented. It uses the redundant force and moment components as primary unknowns, and approximates the non-linearity problem in an incremental pattern. Using a simple linear transformation, the equilibrium matrices are quickly formed via a partial multiplication of a subset of matrices with dimensions (3x3). The convex yield function that describes the static admissibility condition of each zero-length plastic hinge is approximated with a linear convex polyhedron (manifold), whose hyper plane equations are automatically defined with the help of De Bruijn sequences. In this way, a num- ber of complex force/moment interaction criteria may easily be defined that take into account shear and torsion. Discontinuities (e.g. articulations) are also accounted for. Out of the par- tial derivatives of these yield functions with respect to the stresses, the corresponding plastic deformations are computed, with the help of Lagrange multipliers. The formulation may be solved using any non-linear optimization algorithm that solves for linear constraints. Results are compared to those of the equivalent direct stiffness method and to those of the existing literature, proving the efficiency of the proposed formulation. Read More

Conference Paper
by T.N.Patsios & K.V.Spiliopoulos

A Force-Based Formulation for the 2nd Order Elastoplastic Analysis of Frames

A force-based formulation for a nonlinear optimization program that performs 2nd order analysis of plane frames is derived, under assumptions for elastic-perfectly plastic material and non-holonomic plastic hinges of zero length. The problem is solved in an incremental manner using sequential quadratic programming (SQP). Results are compared with existing literature and/or widely accepted commercial packages, proving the formulation efficient and much faster than the direct stiffness method. Read More

Conference Paper
by T.N.Patsios & K.V.Spiliopoulos

Numerical Analysis of Nonholonomic Elastoplastic Frames by Mathematical Programming

The strength as well as the ductility of a structure may be estimated by performing an elastoplastic analysis. In such an analysis structural loading is incrementally applied through a proportional loading factor in accordance to a predefined loading pattern. During this process we have continuous plasticizations of various parts of the structure. For a more accurate description of the physical process, possible deplasticizations should also be taken into account. Thus a nonholonomic material behavior should be followed. In this work such an analysis is performed in an efficient way. The basis of the approach is the formulation of the incremental problem as a convex parametric quadratic programming (PQP) problem between two successive plastic hinges. The solution of this problem is done by assuming a fictitious load factor which establishes a search direction for the next plasticization. The true load factor is established when the plastic hinge that is closest to open really opens. An example of application, which serves as benchmark, is also included. Read More

Edited Book Chapter
by K.V.Spiliopoulos & T.N.Patsios

An Efficient Mathematical Programming Method for the Elastoplastic Analysis of Frames

The elastoplastic nonholonomic analysis of frames is a nonlinear procedure in which the magnitude of the structural loading is incrementally modified using a proportional load factor, in accordance with a certain sequence of predefined loading patterns. It is an attempt by the structural engineering profession to estimate the strength as well as the deformations of framed structures under a given loading. In this work an analysis based on the force method and mathematical programming is presented. An elastic-perfectly plastic material is assumed and conventional plastic hinges of zero length are used to model the plasticity effects. The basis of the approach is the formulation of the incremental problem as a convex parametric quadratic programming (PQP) problem between two successive plastic hinges. A novel numerical strategy is proposed that uses a fictitious load factor to convert the PQP problem to a QP one. The solution of the QP problem, by an effective standard algorithm, establishes a feasible direction on which the true solution lies. The real solution is then found, simply on the demand of the formation of a new plastic hinge that is closest to open. Possible plastic unstressing is automatically accounted for. The approach is first developed for pure bending behaviour and is then extended to cater for moment/axial force interaction. Examples of application under monotonic, variable, and cyclic loading conditions are included. The whole procedure appears to be stable, robust, and computationally efficient as it requires much less time than the alternative displacement based direct stiffness method. Read More

Scientific Journal Article
by K.V.Spiliopoulos & T.N.Patsios

A Quick Estimate of the Strength of Uniaxially Tied Framed Structures

A quick direct limit analysis method to estimate the strength of structures consisting of beam and cable-type members is proposed. The method is based on the kinematic theorem of plasticity and uses equilibrium arguments only. The influence of tension members is accounted for separately, using a shortest path finding technique between the two ends of each such member. The same technique also handles the effect of the indeterminacy for the rest of the structure and the equilibrium with the applied loads. The efficiency of the method is shown through its application to three different structures of increased complexity. Read More

Journal of Constructional Steel Research
by K.V.Spiliopoulos & T.N.Patsios

The story of my life

Born in Marousi, Athens, in 1981. I spent the first one and a half year of my life as an internal immigrant, in the Greek Province of Ilia, in Western Peloponese. In 1983, my family moved permanently to Marousi, Athens.
I completed my primary and secondary education by attending public schools in the neighbouring suburbs of Marousi, Kifissia, and Pefki. In 1999, I was admitted to the School of Civil Engineering of the National Technical University of Athens (N.T.U.A.), via the Panhellenic Exams. In 2005, right after I earned my Diploma, I entered the interdisciplinary programme of postgraduate studies in the Analysis and Design of Earthquake Resistant Structures (A.D.E.R.S.) of N.T.U.A.. In 2008, a few months after earning my M.Sc. degree, I started a challenging doctoral work in the Institute for Structural Analysis and Antiseismic Research (I.S.A.A.R.) of N.T.U.A., under the supervision of Professor K.V.Spiliopoulos. Due to the lack of proper funding, I had to work in parallel; as a result, it took longer than usual to complete this course of studies: I successfully defended my Ph.D. Thesis in July 2019, and was awarded the Title of Doctor of Engineering (N.T.U.A.) in December of that year.
My professional career began ubruptly in 2006, due to my father`s unexpected death. I started a technical office as a sole-trader, doing small projects: My work included in situ measurements and production of architectural -and some topographic- drawings as well as cost estimations for projects, preparation of all necessary documents for issuing working licenses for shops and small businesses, as well as planning and supervision of some small-sized projects that included both restorations and new buildings. Due to the economic crisis and my stubborn refusal to turn to the legalization of structures that were constructed without a building permit, my sole-trading business failed miserably. (For the record: During past decades, it was a common practice among greek people to construct their houses with a few extra square meters than the ones declared in their building permit, mainly due to the increased housing needs which were in contrast with the high building costs; it was the chronic lack of systematic control by the state that gave rise to this. Funny as it may seem, due to the lack of money to pay the debt, the greek state opted to legitimize these structures, under the conditions that their owners would pay a certain fine. These structures would get inspected by a professional engineer for quantifying their undeclared additional square meters, compute the fine, and do the paperwork.). In 2015, when a capital control was imposed on the greek banks, I closed my business and fled the chaos and turmoil of the country, in order to work abroad. Since I had family and common acquaintances in Switzerland, I found a medium-sized engineering company there; I considered myself lucky enough to get hired at that time. Due to negative interpersonal relations with one of the deputies, I managed to endure in this job for 7 months only. At the end of 2016 I returned to Greece where I had been offered shelter in my mother's house and thus was able to focus on my doctoral studies, for which I am utterly grateful. In parallel, I found a part-time job as an educator for the School of the non-commisioned Officers of the Hellenic Airforce, which lasted for one academic year (2017-2018). Since May 2018, I am employed in the private sector as a Project Manager for the Health Fund for the Personnel of the National Bank of Greece (Τ.Υ.Π.Ε.Τ. - www.typet.gr), where I am responsible for the repair and maintainance of their infrastructure.
Apart from work and self-education, I enjoy computer coding, reading books & e-books, watching movies, and listening to music. I like brewing espresso and cappuccino, but usually I prefer a warm cup of tea, as it helps me stay calm during hard work throughout the day (and night, quite often as well).
I guess the reason why up to day I am not a "family guy" is because I am almost exclusively commited to my work. (Pun intended).

My Work Process.

Investigate.

Take a good grasp of the main idea for your project. Explore the possibilites. Think of options which are not obvious, even to the keen eye.

Design.

Organize your steps. Make a preiliminary design. Look up for possible problems as well as for flaws in your thought patterns, think of what could go wrong along the way; and find ways to amend all these, before they actually come up.

Develop.

Begin your adventure with all your positive energy and thoughts, but beware, you will face obstacles along your way. The road to success is open, but it is not paved with rose pedals.

Deliver.

This is the hardest part. Nobody is going to give you a tap on the shoulder, just because you tried; it’s not about trying, it’s about succeeding in delivering within the agreed time schedule and budget.

Meet the Craftsman and his Tools.

Theodoros Patsios
Civil Engineer (NTUA), M.Sc., Ph.D.
MacBook Pro
15.4" (2018)
Intel Core i7 8850H CPU @2.6GHz
32GB DDR4 RAM @2400MHz
ATI Radeon 560X Graphics with 4GB GDDR5 RAM
512GB PCI-E SSD
This is the most reliable computer I ever had; a true work beast.
Cloud Servers
For more computationally intense projects, dedicated cloud servers with 100% guaranteed uptime are available, with the following generic characterictics:
Xeon CPUs with 10 up to 24 Cores
48 up to 256GB RAM
1x256GB up to 2x1TB in Raid 1 SSD
1 up to 10TB Monthly Data Transfer
Windows or Linux
Rhinoceros v.6
Computer Aided Design
What can I say, I am a huge fan of the animal kingdom; apart from rhinos, I also like grasshopers. Oh, and pythons! (Pun intented).
AxisVM X5
Structural Analysis & Design
I consider serving the ideas of an Architect as my first priority: Throw in any architectural design, and I will make you a solid structural system for it; the laws of physics are our only limitations.
Dynamis v.0.1A
Structural Analysis
I wrote this program my self, so that I could have a complete control over my calculations.
Flux v.7.1.11
Web Design & Templates
I confess: I quit making hand-written webpages a long, long time ago; in a manner of speaking. (lol)

Map

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