Question dear mr babak esmailzadeh thank you for past guidance.
what is difference between this two words?
flexibility and ductility .
Answer Dear Behzad
Flexibility is usually interpreted as inverse of stiffness which is a elastic linear concept in our engineering view. It is calculated as the deflection under static loading. For an example you can say : a tender tree is more flexible than a thick one. But ductility has a non linear plastic concept inherent in it. You can say : steel is more ductile than concrete , but you know that a steel beam is not more flexible than a concrete beam of the same size , you can check their deflection under a definite loading to see.
I can answer questions in Structural Engineering, Earthquake Engineering, Project Management and Project Control topics!
I am experienced in the area of earthquake engineering in electrical power industry, i.e. Lifeline Earthquake Engineering. My focus has been on structural seismic design of power installations. Recently I have got involved in project management in the category of constructional engineering.
Organizations Sinam Consulting Engineers Co.
Education/Credentials Bs degree in Civil Engineering from Ferdowsi University ,1988, Mashhad Iran, Ms degree in Earthquake Engineering, Sharif University of Technology, 1993, Tehran, Iran