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I’m researching the progressive collapse. In summary, I want to see what happens if I apply un displacement controlled de 1200 mm under a reinforced concrete frame to simulate the loss of one central column. i.e I want to redo one model of this paper (usefi et al, 2016). Specifically this model: Figure 1.

I already have my model, but it doesn’t give me the correct results as in the paper. this is the model I made: figures 2 and 3

as you can see, the results are not logical. I apply a downward load but it gives me┬ápositive displacement. and it seems that there is some problem with the analytical surfaces I think I’m making basic mistakes because I’m not sure if I’m applying the loading speed correctly.

Any suggestions, please?

Figure 1

Figure 2

Figure 3

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Hi,

Your nonlogical results could have some reasons. From basic such as units of your inputs to how you modeled a quasi-static analysis. Refer to the link below. In this article, you will understand the quasi-static analysis and how to deal with it.

https://caeassistant.com/blog/speed-up-quasi-static-in-explicit-1/

https://caeassistant.com/questions/question/locally-unstable-problems-automated-stabilization

Also, it is worth it to check this link:

https://caeassistant.com/product/abaqus-for-beginners-structural-engineers-in-the-field-of-civil-engineering/

this will help you with your current problem and your future problems as well.

Best regards.

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