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Hello!
I try to analyse a composite beam, that symbolise a real bridge, with concrete slab(panel) and steel girder(bar). The Underlying steel girder has no mechanical connection to the slab, so thers is not full interaction. From in situ measure data shows that there is some interaction, problery due to friction between concrete and steel. I try to model this effect with compatible nodes acting as springs.
The issue is that when I compare the distribution of membrane force in the slab of a modell with beam offset whitout compatible nodes (full interaction) and a modell with beam offset and compatible nodes where the compatible nodes are fixed in all degrees of freedom (full interaction), it get different distribution!
I don't understand why the result differ!
Regards Ludwig!
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