COURSE | INSTRUCTORS | SCHOOL | SEMESTER | HOURS | ECTS | |
---|---|---|---|---|---|---|

CA1 | Applied Structural Analysis of Framed and Shell Structures
| E. Sapountzakis | CV | Winter | 3 | 6 |

CA3 | Non Linear Finite Element Analysis of Structures | K. Spiliopoulos, V. Papadopoulos | CV | Spring | 3 | 6 |

CA11 | Boundary Elements | M. Nerantzaki, I. Katsikadelis | CV | Spring | 3 | 6 |

CA12 | Theory of Shells | V. Koumousis | CV | Winter | 3 | 6 |

CA13 | Experimental Earthquake Engineering | Ch. Mouzakis | CV | Spring | 3 | 6 |

CA15 | Stochastic Finite Elements | V. Papadopoulos | CV | Spring | 3 | 6 |

CA16 | Plastic Analysis of Framed Structures | K. Spiliopoulos | CV | Winter | 3 | 6 |

CA17 | Structural Dynamics | M. Nerantzaki, I. Katsikadelis | CV | Winter | 3 | 6 |

CB1 | Recent Advances in RC Design Models | E. Vougioukas, M. Kotsovos | CV | Winter | 3 | 6 |

CB2 | Advanced Mechanics of Mansory | E. Vintzilaiou | CV | Spring | 3 | 6 |

CB13 | Geotechnical Engineering in Design of Structures | V. Georgiannou, G. Gazetas | CV | Winter | 3 | 6 |

CB18 | Seismic Design of Surface and Underground Geotechnical Structures | G. Bouckovalas, A. Papadimitriou | CV | Spring | 3 | 6 |

CB19 | Design of Steel Buildings | I.Vayas, D. Vamvatsikos | CV | Winter | 3 | 6 |

CB22 | Engineering Seismology | D. Vamvatsikos, I. Taflampas, O. Ktenidou | CV | Spring | 3 | 6 |

CB23 | Load-carrying Behavior and Design of Structural Systems | L. Stavridis | CV | Spring | 3 | 6 |

CB24 | Structural Optimization | N. Lagaros, S. Triantafyllou, V. Koumousis | CV | Spring | 3 | 6 |

CB25 | Special Topics in Earthquake Engineering | C. Spyrakos, I. Psycharis | CV | Spring | 3 | 6 |

CB26 | Signal Processing in Earthquake Engineering | Μ. Fragiadakis, I. Taflampas | CV | Winter | 3 | 6 |

CB27 | Pathology and Design of Structures under Seismic Actions | P. Carydis | CV | Spring | 3 | 6 |

CC8 | Engineering Materials | G. Fourlaris, P. Tsakiridis | CV | Spring | 3 | 6 |

CC9 | Information systems in Construction Managementnot available in academic year 2020-2021 | J-P. Pantouvakis | CV | Spring | 3 | 6 |

courses
(from the total of
courses)

The displacement vector of a particle of a body. Components of strain of a particle of a body. Implications of the assumption of small deformation. Traction and components of stress acting on a plane of a particle of a body. Proof of the tensorial property of the components of stress. Properties of the strain and stress tensors. Components of displacements for a general rigid body motion of a particle. The compatibility equations. Equations of equilibrium. Stress-strain relations. Formulation and solution of boundary value problems using the linear theory of elasticity. The principle of Saint-Venant. Prismatic bodies subjected to pure tension. Prismatic bodies subjected to pure bending. Plane stain and plane stress problems in elasticity. Fundamental assumptions of the theories of mechanics of materials for line members. Internal actions on a cross-section of line members. The boundary value problems in the theories of mechanics of materials for line members. The boundary value problem for computing the axial component of translation and the internal force in a member made from an isotropic linearly elastic material subjected to axial centroidal forces and to a uniform change in temperature. The boundary value problem for computing the angle of twist and the internal torsional moment in members made from an isotropic linearly elastic material subjected to torsional moments. Primary and secondary warping functions. Warping normal stresses. The classical theory of beams. Solution of the boundary value problem for computing the transverse components of translation and the internal actions in prismatic beams made from isotropic linearly elastic material. The Timoshenko theory of beams. A displacement and a stress function solution to transverse shear loading of beams. Computation of the shearing components of stress in beams subjected to bending without twisting. Shear center. Theory of plates. Buckling of elastic structures. Nonlinear theory of elasticity.

Assistant: A. Kampitsis

Basic principles of Continuum Mechanics. Nonlinear kinematic relations, Green-Lagrange strains. Cauchy and Piola-Kirchoff stresses. Principle of virtual work, nonlinear equilibrium equations. Total and updated incremental Lagrangian formulations. Linearization of equilibrium equations. Incremental-iterative solution methods for the static and dynamic nonlinear equilibrium equations. Newton-Raphson type methods and path-following strategies with line search and arc length techniques for overpassing limit points. Geometrically nonlinear isoparametric finite elements of 2D and 3D elasticity problems as well as of plates and shells. Tangent stiffness matrices. Material nonlinearity. Explicit and implicit integration of the incremental stresses. Tangent and consistent constitutive matrices. Elastoplastic stiffness matrices of isoparametric 2D and 3D continuum elements and isoparametric plates and shell structural elements. Applications of nonlinear FEA using commercial finite element codes.

Assistant: G. Soimiris

Introduction. Boundary Elements and Finite Elements. Historical development of the BEM. Preliminary Mathematical Concepts. The Gauss-Green theorem. The divergence theorem of Gauss. Green’s second identity. The Dirac delta function. The BEM for Potential Problems in Two Dimensions. Fundamental solution. The direct BEM for the Laplace and the Poisson equation. Transformation of the domain integrals to boundary integrals. The BEM for potential problems in anisotropic bodies. Numerical Implementation of the ΒΕΜ. The BEM with constant boundary elements. The Dual Reciprocity Method for Poisson’s equation. Computer program for solving the Laplace equation with constant boundary elements. Domains with multiple boundaries. The method of subdomains. Boundary Element Technology. Linear elements. Higher order elements. Near-singular integrals. Applications. Torsion of non-circular bars. Deflection of elastic membranes. Bending of simply supported plates. Heat transfer problems. Fluid flow problems. The BEM for Two-Dimensional Elastostatic Problems. Equations of plane elasticity. Betti’s reciprocal identity. Fundamental solution. Integral representation of the solution. Boundary integral equations. Numerical solution of the boundary integral equations. Body forces. Computer program for solving the plane elastostatic problem with constant boundary elements. Applications.

Assistant: N. Babouskos

Introduction to shell structures. An historical overview. Basic elements of differential geometry. Space curves, parametric representation. Surfaces as grid of families of space curves. First fundamental form. Applications. Assumptions of thin shell theories. Stress resultants per unit length. Equilibrium Equations. The general initial and boundary value problem of theory of shells. Statical indeterminacy of the general problem. Membrane theory assumptions. Cylindrical shells. General solution for the statically determinate problem. Strains and displacements. Applications. Use of symbolic language i.e. Maple or Mathematica for the solution of cylindrical shells for various loading cases and support conditions. Membrane theory of conical shells. Equilibrium equations. General solution. Applications. Use of symbolic language i.e. Maple or Mathematica for the solution of conical shells for various loading cases and support conditions. Membrane theory of Shells of revolution. Equilibrium equations. General solution for axisymmetric loading cases. Spherical Shell. Hyperbolic shells. Applications for open or closed spherical shells. Shells of revolution for arbitrary loading. Fourier series solution, symmetric and antisymmetric cases. Differential geometry notion of curvature. Second fundamental form. Gauss-Godazzi conditions. Bending theory of cylindrical shells. Axisymmetric loading. Beam on elastic foundation type of solution. Donnell theory. Applications for cylindrical shells with different boundary conditions. Comparison with numerical solutions with finite element method. Design provisions of Eurocode 3 for steel thin shell structures.

Assistant: K. L. Antoniadis

.

Scope: The course aims at the investigation of the effect of uncertain parameters (material and geometric properties, loading) on structural response variability.

Introduction: Random variables, cumulative distribution function, probability density function, statistical moments (mean value, variance, skewness and kurtosis), covariance. Stochastic processes and fields: Definition, stationary stochastic processes, ergodicity, analysis in the frequency domain-Fourier transform: autocorrelation and spectral density functions, Gaussian stochastic processes. Representation/discretization of stochastic processes and fields using (i) Point discretization methods: midpoint, integration and nodal point methods (ii) Average discretization methods: local average and weighted integral methods (iii) Spectral representation method: simulation of stationary Gaussian stochastic processes and fields. Formulation and solution of the stochastic problem: Stochastic virtual work principle, formulation of the stochastic stiffness matrix using the local average and weighted integral methods, solution by Taylor, Neumann series expansion and by Monte Carlo simulation. Applications: Computer applications on framed structures and 2D elasticity problems: investigation of the effect of several stochastic field parameters (probability distribution, correlation length and autocorrelation function) on structural response variability.

Assistant: S. Pirialakos

Introduction to the plastic design of structures. Redistribution of forces. Ductility. Relation with the Codes of Practice. Step-by-step 1st order elastoplastic analysis of frames. Principle of virtual work. Lower and upper bound theorems of plastic collapse. Safe moment distribution. Collapse mechanisms. Holonomic and non-holonomic behaviour. Mathematical programming. Kuhn-Tucker conditions. Linear programming. Simplex method. Mesh and nodal description. Static-kinematic duality. Flow rule. Stable materials. Rigid plastic behaviour. Alternative linear programs of limit analysis. Uniqueness of limit load. Automatic limit load evaluation. Optimal plastic design. Automatic optimal plastic design using linear programming. Variable loading. Alternating plasticity. Incremental collapse. Shakedown. Residual stress. Melan’s theorem. Mesh-unsafe shakedown linear program and automatic shakedown load evaluation. Relation between limit and shakedown load. Elastoplastic analysis with 2nd order effects. Large displacements. Geometric non-linear elasto-plastic stiffness matrix. Arc-length method. Comparison of limit loads with and without 2nd order effects. Merchant-Rankine formula. Inelastic dynamic analysis of MDOF systems. Seismic response of buildings. Ductility ratios. Pounding of buildings. Reference to approximate static methods (pushover, etc.). Practice with commercial packages (SAP, Abaqus, etc.).

Scope

The course aims to the in-depth understanding of the inelastic behaviour of framed structures since plasticity is the basis of all today’s Codes of Practice. Emphasis is also put on the mathematical framework and the computational techniques of plastic analysis. In this way the course addresses both the practicing engineer and the researcher.

Assistant: G. Bentour

Dynamic loads and dynamic models of structures. Methods of derivation of equations of motions for structural systems (Equilibrium of forces, principle of virtual displacements, Hamilton’s, principle, Langrage equations). Damping (viscous, Coulomb, structural). Discretization of continuous systems. Free and forced vibrations of SDOF systems. The finite element method for beam structures. (plane and space trusses and frames). Rigid bodies in elastic structures. Axial constraints. Free vibrations of MDOF systems. Modal damping, proportional damping. Numerical evaluation of eigenfrequencies and mode shapes. Partially restrained structures. Forced vibrations of MDOF systems. The method of modal superposition. Modal participation, static correction method. Reduction of degrees of freedom (kinematic constraints, Ritz vectors). Support excitation. Response spectrum analysis (ABSSUM, CQC, SRSS). Nonlinear response of structures Numerical solution of the equations of motion in time domain. Dynamic analysis of multi-storey buildings. Base isolation. Applications to civil engineering structures.

Assistants: N. Babouskos

Concrete behaviour: Strength, stress-strain behaviour under short-term loading, cracking, failure mechanism.

Behaviour of structural concrete elements: Modes of failure, causes of failure, physical model of element behaviour.

Design of structural concrete elements: Compressive force path method, earthquake-resistant design, application of the method for the design of beams, columns, structural walls, slabs, frames, etc.

Technology of old and modern masonry.

Behaviour of masonry in compression, in tension, in shear

(Out-of-plane) Buckling and bending of plain, confined and reinforced masonry

The Mechanics of tie-beams (timber or RC)

Behaviour of interfaces within masonry. Mechanisms of load transfer (friction between mortar and stone or brick, pullout/push-in, dowel action)

Methods of analysis of masonry structures

In situ assessment of mechanical properties of historic masonry

Pathology of masonry structures

Assessment of residual properties of masonry

Intervention materials and techniques

Design and redesign models for masonry

The topics of seepage, compression and consolidation are examined briefly and are related to engineering practice and to current research work. By using an extended case study of the Tower of Pisa as a theme, the concepts can be applied to different soils and the long-term settlement of soil can be assessed. The major challenges facing designers of multi-propped deep excavations, particularly in crowded urban areas are examined. Embedded retaining walls such as secant bored pile walls and diaphragm walls used in the construction of deep sections of retained cuttings and cut-and-cover tunnels in road schemes and excavations in urban cities are studied with emphasis on the stress transfer and deformation mechanisms around diaphragm walls. The study of retaining systems is extended to include reinforced soil retaining walls and/or steepened embankments, as a relatively new cost effective method of construction which reduces embankment width and land-take and is environmentally acceptable. The classic preliminary design methods, including Eurocode 7, are presented both for retaining walls and reinforced soil. By using case studies (e.g. Egnatia Motorway) the Codes of practice are applied through analytical programs. The earthquake loading is assessed for conventional retaining walls, reinforced soil walls and bridge abutments.

Assistant: E. Pavlopoulou

This post-graduate course has the following themes:

1. Introduction to Geotechnical Earthquake Engineering. Basic elements of engineering seismology, with emphasis on strong ground motion.

2. Single degree of freedom structural vibration with base excitation, elastic response spectra.

3. Seismic wave (P, S, Rayleigh, Love) propagation in homogeneous and inhomogeneous soil.

4. Seismic design of underground tunnels and pipelines against seismic waves and permanent ground displacements.

5. Soil amplification (or de-amplification) of seismic ground motion with analytical and numerical methods. Practice with dedicated software.

6. Seismic design of retaining walls with the Mononobe-Okabe method (pseudo-static design) and with Richards-Elms (allowable displacements),

7. Topography effects and seismic design of soil and rock slopes.

8. Liquefaction, with emphasis on assessment methods and on its effects on Civil Engineering works. Description of ground improvement methods and methods for mitigating the effects of liquefaction.

Assistants: J. Tsiapas, K. Mpazaios, L. Tsantilas

Assistants: G. Dougka, D. Giannopoulos

The lesson of Engineering Seismology presents the following subjects dealing with the estimation of earthquake hazard and loss assessment.

Presentation of regional seismicity, fault description and earthquake source mechanism.

Characteristics and effects of near field ground motions.

New generation attenuation relationships.

Evaluation of seismic hazard.

Site effects on ground motion.

Artificial accelerograms and simulation of near field pulses.

Selection of seismic records for design.

Review of earthquake loss assessment methods.

Presentation of loss assessment HAZUS methodology.

Displacement based loss assessment methods.

Assistants: A. Chatzidaki, K. Mastrodimou

Structural behavior and design of steel and reinforced concrete beams

Structural behavior and design of prestressed concrete beams.The treatment of prestressing

Structural behavior of one-story and multistory frames. Gravity loads, Horizontal loads, Lateral stiffness. Juxtaposition of shearing and bending behavior.

The influence of deformations on the structural behavior of beams (Second order theory)

The influence of deformations on the structural behavior of frames (Second order theory)

Structural behavior and design of arches and arch-beam systems

Load-carrying behavior and design of cable prestressed structures

Main characteristics of the structural behavior of grids

Specific topics on the structural action, behavior and design of reinforced and prestressed concrete slabs

Basic concepts. Design variables, objectives and constraints. Optimal sizing, shape and topology design problems for skeletal and 2D structures. Continuous and discrete optimal design problems. Methods of mathematical programming. Linear programming problem, simplex method and interior point methods. Nonlinear programming. Approximate methods of solution. Duality principle. Optimality criteria methods, fully stresses design and redesign formulas. Applications with Excel, Fortran and Matlab. Sensitivity analysis, approximate methods. Accuracy and reliability of sensitivity analysis methods. Sensitivity analysis of skeletal and 2D structures analyzed with the finite element method. Direct method of sensitivity analysis. Adjoint method. Applications by using the finite element method computer program NASTRAN. Discrete optimization problems. Some basic problems of integer programming. Dynamic programming, simple applications. Genetic algorithms- evolutionary optimization algorithms. Applications to structural design problems.

Assistant: G. Kazakis

Principles of seismic design of special structures (e.g. bridges, tanks, dams).

Criteria for the selection of the appropriate structural model.

Displacement based seismic design.

Dynamic soil-structure interaction / methods of analysis and applications.

Dynamic structure-water interaction / methods of analysis and applications to representative systems (dams, tanks).

Principles of seismic design of structures with base isolation / applications.

Seismic assessment of existing structures.

Retrofit and strengthening of structures / methods of analysis and applications.

The course consists of three parts.

1) Introduction to signal analysis. Autocorrelation and crosscorrelation. Analysis in the frequency domain, Fourier transform and power spectra. Wavelet theory and applications. Transfer functions.

2) Ground motion time histories, analysis, correction and filtering. Intensity measures, energy and pulse-like content. Signal rotation for the extraction of mean values and directivity azimuth. Synthetic and semisynthetic accelerograms.

3) Characteristics of structural dynamic response time histories. Elastic and inelastic response of single degree of freedom systems. Deterministic methods for the evaluation of structural dynamic characteristics and their transformation. Application of wavelets. Design based evaluation. Probabilistic methods based on fragility curves.

Homework problems including a small project based on the analysis of structural response time histories under severe ground motion are used to cover all topics.

Assistants: K. Mastrodimou, Z. Achmet

.

Classes of materials: Metals and alloys, ceramics, polymers and composite materials. Technological evolution and trends, properties and cost comparison, main applications.

Structure-properties relationships: Nature of chemical bonding, crystal structure and imperfections, dislocations. Solidification of metals. Mechanical properties and their dependence on the microstructure. Hardness, tensile strength, ductility, toughness, strain hardening, recovery and recrystallization. Fracture mechanisms, elements of fractography. Impact strength, transition from ductile to brittle fracture.

Other properties: Fatigue and fretting fatigue. Creep. Wear resistance. Corrosion and high temperature oxidation. Protection against corrosion (coatings, anodic and cathodic protection).

Study of some common alloys: Iron and steel, cast iron, aluminium and light alloys, copper alloys.

Production and processing methods and their relation to mechanical properties: Casting, hot and cold forming, powder metallurgy. Defects, inclusions, texture and anisotropy.

Welding: Welding methods, welding joints, welding defects and non destructive methods.

Construction steels: Plain carbon and low-alloy steels. High elastic limit steels, dual phase steels, controlled rolling and microalloyed steels. Stainless steels. Steels for low temperature applications.

Reinforced concrete steels: Types and relevant mechanical properties. Resistance to high temperatures. Weldability and welding techniques.

Overview of information systems in construction management. Review of construction management as an information processing system (techniques, procedures, Books of Knowledge (BoKs), Contract types). Review of time scheduling methodologies (MPM, linear methods, simulation, critical chain, monte carlo), Use of commercial systems (Primavera, MS-Project, Excel, 4D systems). Information Systems Analysis and Design Techniques (Data bases, Systems Analysis, Systems Design). IT & telecommunications applications in construction management (PDA's, wearable computers, wireless & satellite networks, project websites, e-site, e-construction, document control systems).