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The following is based on the following AutoPIPE's help section:
Help > Contents> Contents Tab> Modeling Approaches> Modeling Approaches> Frames> Frames: Pipe Rack Modeling Examples
Frames: Pipe Rack Modeling Examples
Frame structures are commonly used to support piping systems. In most cases, the structure is assumed to be much stiffer than the piping itself and can be modeled simply as a rigid support. However, AutoPIPE also allows a supporting frame structure, such as a pipe rack, to be included in the system model.
The following models depict a system of parallel pipe runs (shown in the figure) which are supported by a pipe rack structure. The pipe-frame connection type varies with each model. The piping system is usually defined first as this simplifies the modeling of the frame that supports the pipes.
Three methods for modeling pipe racks are provided below:
Each piping point is connected to a corresponding beam point using a two-point support (tie/link).
A pre-defined directional support at each piping point can be connected to a single beam point. This model takes advantage of the fact that a V-stop always restricts the movement of a point in the vertical direction irrespective of the location of the Connected to point. This simplifies the modeling of the frame itself as definition of all connection points are not necessary. However, all of the support reactions are transferred to the one beam point rather than their actual locations (directly beneath each piping point).
Each piping point is connected directly to a corresponding beam point. This model represents a rigid connection between the pipe and beam member.