CIV-E4100 - Stability of Structures D, 01.03.2021-18.04.2021

Osion kuvaus

• Course content and litterature
  Stabilty of Structures
  

   This course name is the stability of elastic structures.
  

  The following fundamental two questions are addressed:
  

    1)  Is the equilibrium stable or not?

  
  

  
  

  
  

  and

  
  

  2)  What type of post-buckling behaviour?
  

  
  

  The Figure bellow represent a post-buckling FE-analysis of an I-Beam loaded with a centric transversal tip-load        (Computation D. Baroudi, 2019)
  

  
  

  Content

         0.     Basic concepts
  

                Equilibrium, Stability
  

                The energy criterion of stability

  
  

  1.    Flexural buckling (nurjahdus)
  2.    Lateral-torsional buckling (kiepahdus)
  3.   Torsional buckling (vääntönurjahdus)
  4.   Buckling of thin plates
  5.   Buckling of shells (lommahdus)
     

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  List of the six homework and assignments to be done during this course:

  1.       week 1:- Fundaments of Elastic Stability

  2.       week 2: - Flexural stability loss

  3.       week 3:  Lateral torsional, pure torsional and combined flexural-torsional buckling

  4.       week 4 - Computational Stability Analysis. Application example: Lateral torsional buckling & post-buckling

  5.       week 5 - Buckling of plates
  

  6.       week 6  - Buckling of shells (only one exercise)

  
  

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  Literature

  • CHAI H. YOO &  SUNG C. LE .    STABILITY OF STRUCTURES - Principles and Applications, 2011 Elsevier e-textbook (our course main textbook)

  
  

  Additinal reading: (not compulsory)
  

  • S.P. Timoshenko & J.M. Gere.   Theory of Elastic Stability.  2nd Ed., 1985.  (Classical textbook)
  • Juha Paavola. Structural Stability.   Lecture note - 2018 (pdf in MyCourses) .       This is a must-read for those interrested in general and systematic energetic approach for elastic stability.
  • Structural Stability (Lecture notes by Prof Markku Tuomala, in Finish). This is a complete textbook with plenty of solved exercises.

  • Lecturer weekly provided additional material

  • Some article fron NATURE for curious people
    

  1) - surface instabilities induced by growth:    https://mycourses.aalto.fi/pluginfile.php/1260824/course/section/158919/1_art_STABILITY__A%20three-dimensional%20phase%20diagram%20ofgrowth-induced%20surface%20instabilities.pdf

  2)- surface instability idem.   https://mycourses.aalto.fi/pluginfile.php/1260824/course/section/158919/Surface_wrinkling.pdf
  

  
  

  Passing the course  
  

  • Having obtained from HW-assignements  >= 40% of compulsory points  togather with passing successfully the written exam.

  
  

  • when the written exam is successfully passed, then the homework points rise the examination grade (arvosana) at most by 1 grade if homework  points >= 2/3 of homework compulsory maximum points.

  • There will be organised only two examinations
  • 
    

  Assignments

  • readings from textbook and the additional lecturer's pdf-material

  • doing weekly homework (probably five topics) student delivery: solutions

  • one computer analysis: linear buckling and post-buckling analysis: student delivery: solutions and report

   

  The purpose of assignments is to train and deepen active learning. All the cession of exercises are guided.

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  Lecturer

  Djebar BAROUDI,  Dr.

  Lecturer

  Allto University