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I am running a code for a 3D bridge and my transverse force-displacement plot is not starting from zero, but my longitudinal force-displacement plot is. If I turn off the gravity loading and just apply the masses to each node, the plots look fine, but the transverse direction starts at 6.1 kips when...

I am trying to develop a simple stick model for a bridge deck with a concrete slab and steel girders. Is it possible to define two different elements between two nodes? I want to define one element with the concrete section and one with the girder section properties. If this is possible, are there a...