Answer:
Short answer: No.
Detail comment:
The "Distributed Load" as defined in the GR (Gravity) scenario is approached in a distinct manner. As per the documentation, distributed loads in AutoPIPE are inputs based on force that are applied across a segment of the model. These loads are intended to represent forces such as snow, ice, or other uniform pressures exerted on the pipe, and they are applied as static forces within the designated load case (for instance, GR for gravity).
A crucial aspect to note is that distributed loads are not regarded as mass during dynamic analysis. They are solely treated as static forces in static analysis scenarios. The documentation pertaining to the DIST (Distributed Load) command clearly indicates that distributed loads cannot be established in dynamic load cases (like R1, F1, H1, etc.) and are exclusively applicable to static load cases such as GR, T1-T100, E1-E30, W1-W10, P1-P100, and U1-U140.
This indicates that even if a distributed load is defined within the GR case, it will not be transformed into mass or factored into the mass matrix for dynamic analysis. Only the actual mass of the pipe, its contents, insulation, and any specified "Additional Weight" are taken into account for dynamic effects.