linear and nolinear analysis, the main points are:
use appropriate contact between concrete and steel tube
use confined concrete relations to model nonlinear compresion behavior of concrete
to can help you, please define your problem exactly, and send me the cae file to check it
@ali Khalil Can you suggest me some good models for confined concrete? Furthermore, Please suggest some good and simple models for modelling the contact
@Ibrahim First Analysis. I want to study the response of Concrete filled steel tubes to flexural and compressive forces. I will send you the cae file soon
for confined concrete use mander's model. to define contact it is better to use penalty approch with friction coefficent and hard contact.
for loading plate with coomposite column use tie and shell to solid constraints interactions
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