How are truss joist members stress transfered?

[SeizeTheMoment]

As I understand, truss sytems transfer loading axially unless there are attachments to the chords mid-span. In order for this to happen, all of the loads must apply to the panel points. My question is for the top chord in particular. Wouldn't a roofing system be idealized as a line load, causing the top chord to bend? Or is there a specific way that the roof attachment to joists only apply at the top panel points?

 

[Tomfh]

Yes top and bottom chords bend between nodes, and there is some incidental bending of web members too.

 

[HTURKAK]

Wouldn't a roofing system be idealized as a line load, causing the top chord to bend?

If the roofing system supported on purlins , the answer is typically no. If the roofing is supported directly on top chord , in this case you are expected to design top chords for axial load+ bending .
The connections are modelled as pin connection however all the truss members will subject to bending due to displacements of welded rigid connections but still the members designed for axial loads if there is no any span loadings.