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Riks analysis gives Negative Time/LPF Inc.

Riks analysis gives Negative Time/LPF Inc.

Riks analysis gives Negative Time/LPF Inc.

(OP)
Hi everyone,

I am running post-buckling analysis to investigate the stability response of an isolated column. There are two "step": Static,General(Step 1) with axial force on top and Static, RIKS (Step 2) with horizontal displacement on top of column. Once the column starts to buckle in RIKS analysis, Time/LPF Inc. is changing to negative value (Arc Length is almost constant) and horizontal displacement is reversed!!! As I need to look at the column response in post-buckling range, top displacement should reach to the target displacement that I specified but this does not happen?

I do not really understand the issue regarding the RIKS analysis.

Anyone can give me some suggestion?

Thanks in advance.

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