Hello everyone,
I'm simulating the axial compressive behavior of both circular and rectangular CFSST stub columns. Things went fine with the circular section but the opposite applied to the rectangular section as the solution didn't converge and not even reach at least my desired applied load (displacement control)
I used both C3D8R element for both steel tube and core concrete with contact property as follows:
Tangential direction: Penalty method with 0.6 coefficient
Normal direction: Hard contact (allows for separation after in contact)
The effect of corner region of the steel tube is also considered by partitioning the steel tube into multiple parts (See figures below). I tried both static general and static riks but none of them converge with the step time increment of:
initial increment: 0.001, minimum: 1E-20, max: 0.05 (or even smaller such as 0.025)
Please help me out guys. I'm really desperate for this problem.
Dear Samy Elhadi Oussadou
,Thank you for your details explanation and the possible procedure that could solve my problem.
The thing is, I'm also working on the simulation of circular CFSST columns and it converges fine and very quick to solve as well. But when I applied the setting of the circular section to the rectangular section, this problem arises as I stated earlier.
I try changing the initial time step, but I don't want to modify the contact properties as it was what many researchers employed in their research work which I cited. Plus, I don't think the contact properties could be what causing this problem, but I'll try adjusting them to see if it helps in anyway.
I could send you my CAE file too if you want to investigate in details about my boundary or loading conditions as well as other material properties.
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