The 1st image shows the structure, the steel bars are colored in yellow, and the cables are colored in green. And the 2nd one shows the error.
Can you post same more information. However you better launch the analysis by parts till completing all the model, so you can localize the error.
There are two load cases. The first one includes the own weight and the pre-stressing forces in the cables. While the following one includes the imposed live load. Both cases are nonlinear static considering the "P-Delta plus Large Displacements" effect.
I am doing a parametric study on this structure by changing the number of modules in each direction, the span/depth ratio and other parameters. The imposed live load is 0.75 KN/m^2. I think it's a bit large but not very large since this structure (with the same dimensions) is safe under the same live load with different parameters. In addition, I increased the sizes of both steel bars and cables many times than the first assumed ones and it still doesn't work.
No, i didn't try. I need first to know the significance of this error, and then I will try to fix it.
in such a complex structure the error can be due to many issues. ..also bad modelling,... discretization, loss of stiffness, etc. .. I think that the best solution could be to increase complexity in geometry step by step.. and then include effects such as P-delta, etc..
another way to understand if the error arises from stiffness problems you can add more restraints and see if it works and then delete them till you locate the error.
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