I modelled a 3d truss with one storey concrete structure attached to it as shown on the model. I know that the one storey concrete structure changes the rigidity and the flow of the forces on the truss, but my third bay truss ( encircled on the figure ) is taking excessive axial forces such that it requires insane angle bar sizes for the chords and webs to pass.
What is the explanation for this? any recommendation on how I can fix this ?
The purposes and space limitations are unclear under the trusses (which in the drawing are not "yet closed" and therefore improperly trusses, no matter if they are 3D structured). Likewise, the needs and usability of the passages between the pylons, which the project requires, are not known. But maybe you just need some bracing (see for example the added bars in red) where possible, if the design allows it. As an alternative, you can try to intervene on the single portal as per the drawing below (see the enclosed pdf document Agile.pdf).
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