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Hi experts here, im calculating the moment of the central beam (simply supported) for superimposed dead load case, my max moment based on my calculation is (2.7*14^2)/8=66.15kNm, i dont know the how the additional 90.85kNm from the tie beam were calculated in the model. Thank you.
It seems your center beam (with the help of the SHSH 200x200 secondary beams) is stiff enough to carry some of the load coming from the upper slab through the SHSH columms. This becomes clear when you see the deformation mode and the moment diagrams on the SHSH beams.
Other than that ,
1- you should exclude the "cables" from receiving the load
2- Matrix is not positive definite warning appears because your "cable" bars( truss tension only) are crossing each other ,and for RSA they are intersecting statically and this cannot be as they only support axial forces . Use releases instead if you want to get rid of the warnings. Results will be almost identical
Rafael Medeiros
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Hi@efyjw7
Usually, this kinds of truss without vertical diagonals are modelized as the picture below:
Upper chords not splitted and no releases on posts.
You'll not get warnigs about "matrix is not positive definite..."
M. Agayr
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No critical warnings in your model.
After splittings columns, redefine stories.
Check if you didn't forget to apply loads on these claddings.
M. Agayr
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