Design of Steel Structures by Finite Elements

Year
0
Academic year
2018-2019
Code
02005225
Subject Area
Computation
Language of Instruction
Portuguese
Mode of Delivery
Face-to-face
ECTS Credits
6.0
Type
Elective
Level
2nd Cycle Studies - Mestrado

Recommended Prerequisites

The pre-requisites of this course are those corresponding to the application for the MSc course CMM.

Teaching Methods

Teaching is given in classes including numerical examples worked out using the computers available in the classroom. Two compulsory assignments are given at the beginning of the course which should be submitted within three weeks after the course is finished.

Learning Outcomes

The aim of this course is to introduce the methodologies of design using FEM and  give students an understanding of the behaviour of steel tubular towers for wind turbines, using analytical and numerical methods and to practice design calculations.

The course is conceived in order to give students following skills:

-  Understanding of the instability phenomena and a basic background theory.

-  Understanding and knowledge on how to calculate design resistance of a tower according to Eurocodes.

-  Understanding basics of manufacturing and maintenance of different tower types.

-  Understanding of behaviour and basic elements of design of best-practice details of bolted joints.

-   Knowledge in how to performed FE analysis and interpret obtained results.

Work Placement(s)

No

Syllabus

1. Introduction wind power potential

2. Actions and tower design criteria

Turbine. Tower structural concepts. Steel, hybrid, concrete, lattice. Costs, preferences. Comparison between different tower concepts. Rules, standards, recommendations, guidelines. Safety and reliability. Structural safety, structural reliability, code calibration. Load types. Applying design loads on FE models.

3. Tower connection

Design checks. Failure modes. Flange connection. Friction connection. Structural detailing, loss of the pre-tension force.

4. Stability of shells

Concept of elastic stability. Instability phenomena; Basic concepts and models; Single and coupled instability modes; Imperfection sensitivity; methods of analysis. Circular cylindrical shells: buckling of circular cylindrical shells, Finite Element Modeling. Design approach.

5. Foundation

General about possible solutions.

6. Fabrication, assembling and maintenance

Description of the production process. Transport and erection. Size limits.

Assessment Methods

Evaluation
Two compulsory assignments are given at the beginning of the course which should be submitted within three weeks after the course is finished: 100.0%

Bibliography

1.    EN 1990 (2002). "Eurocode - Basis of structural design", CEN, European Committee for standardization, Brussels, Belgium.
2.    Eurocode 3 - Design of steel structures - 2005, Fatigue, European Committee for Standardization (CEN), Technical Committee 250, Subcommittee 3, Brussels.
3.    GL Wind Guideline, 2004, Guideline for the Certification of Wind Turbines, Germanischer Lloyd WindEnergie GmbH, Hamburg, Germany.
4.    International Electrotechnical Commission – INTERNATIONAL STANDARD IEC61400-1: Wind turbines, design requirements, Geneve, 2005.
5.    Burton T, Sharpe D, Jenkins N and Bossanyi E. – Wind energy handbook (Chichester: Wiley), 2001
6.    Hansen, M.O.L. – Aerodynamics of Wind Turbines, 2nd edition, Earthscan, UK, 2008.
7.    Hau, E. – Wind Turbines – Fundamentals, technologies, application, economics, Springer, Berlin, 2006