The structure under study is a steel-concrete composite box girder. Below is the figure for load-displacement curve I obtained from experiment and FE analysis using ABAQUS. The curves as well as the failure mode at ultimate load agree well with each other. However from numerical simulation, the specimen seems to have post-buckling behavior. The only reason I came up at the moment is that the difference between curve is caused as the loading procedure in experiment wasn't continued for much further step after the load dipped. By saying this, I mean that my FE simulation is right. Am I correct or missing something?
Dear Rajan Khadka
The Post Buckling behaviour is a non-linear behaviour which takes place in a very short amount of time. Also the amount of deformation is high at which during the buckling, self-contact can occur. The first initiation of buckling is often related to modeshapes obtained from a modal frequency analysis.
I think you have remove your non linear property of your model,Then you run the simulation.
I hope this help for you.
Regards ,
BALASARAVANAN K
May be you should have a check on the constitutive relationship of steel that you selected for this FE simulation.
Also，FE model is idealized，while the real stricture is always accompanied with defects，faults，like poor welding...
in addition，it's better for you to post your FE model here.
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