Select Support from the Insert or Modify menu to display the Support dialog. A support may be added at any point in the piping (or framing) system, and more than one support is allowed at a point. Once the "Support Type" is specified, the dialog is updated to provide additional fields which are unique to the type of support requested. With an AutoPIPE model loaded, open a the support dialog screen and press the " Help " button. The table will provide detailed information about the 9 different support typs including bearing direction, and support options for each type of support. From the online help, only when the first support is entered into a model does the dialog have any default values. Each successive support inserted afterwards, the dialog recalls the previous settings. Item #1: Methods for modeling supports Be sure to review, AutoPIPE help section: Help Contents Contents Tab Modeling Approaches Modeling Approaches Support a. Model 1: Saddle Support b. Model 2: Trunnion Support c. Model 3: Rod Support 1. Model Vertical Rod support 2. Model pendulum swing of a pipe on a rod support d. Model 4: Pedestal with Rigid Strap e. Model 5: Rigidly Guided Pipe Slide Assembly f. Model 6: Sway Strut g. Model 7: Spring Can with Friction Item #2: Base Supported Elbows Be sure to review, AutoPIPE help section: Help Contents Contents Tab Modeling Approaches Modeling Approaches Bends Base Supported Elbow a. Model 1: Supported at a tangent point (simple vstop support for fig 1.2.6 a) b. Model 2: Supported at a point along the bend (simple vstop support for fig 1.2.6 b) c. Model 3: Alternate method for defining a support at a midpoint d. Model 4: Modeling a "dummy leg" as a structural member (fig 1.2.6 b & c) e. Model 5: Modeling a "dummy leg" as a pipe (Recommended fig 1.2.6 b Item #3: Building Structures To add structural steel cross-sections to the model: Select Insert Beam Section Properties... Select the steel sections from the libraries to be used in the model; called Section ID's. To insert a new beam into the model: Select Insert Frame... NOTE : Beam assemblies can be copy/pasted into the model (connected or unconnected). This is useful for independent pipe rack portal frames. Item #4: Pipe Rack Modeling Examples Be sure to review, AutoPIPE help section: Help Contents Contents Tab Modeling Approaches Modeling Approaches Frames there are 3 examples of pipe rack modeling Item #5: Support type that is not active for static seismic and dynamic load cases Item #6: Model Wind Sway On A Pipe Rack Item #7: Modeling Pipe-Structure Interaction in AutoPIPE Item #8: Modeling Guide Supports A guide support in AutoPIPE is different than Caesar's guide element - it's equal to Caesar's 2 supports (guide and Y stop). In AutoPIPE, a guide supports the pipe in the vertical and lateral directions but not axial. You can input gaps to remove vertical support or other directions if required. A guide support in AutoPIPE is always normal to the local pipe axis, so if the pipe is rotated the guide stays normal to the pipe which is very useful also when guides on skewed pipe. NOTE: Large gap will not display the support symbol in that direction for convenience. Item #9: Model a U-bolt in AutoPIPE Item #10: Working on Combined Structural & Piping models Item #11: Define a Displacement at a Support In AutoPIPE simply assign a displacement at the support for any load case, GR, T1, T2, E1, etc during modelling. Caesar has limitation of defining only 9 displacements which have to be combined in post processing to specific load cases. Select Insert Xtra data Imposed Support Displacement... The Imposed Support Displacement dialog opens. Enter in values and click OK . These can be applied also to anchors but only act in the direction of the restraint. Item #12: Model equipment supported by spring Item #13: Can you provide me a reference for where to use flexible anchor and where to use rigid anchor. In addition, Can you guide me for the use of supports as rigid or flexible. Does Bentley provide some literature for modeling of standard pipe supports in AutoPIPE? Answer: Modeling of typical pipe supports can be found in the following online help location: Help Contents Contents Tab Modeling Approaches Modeling Approaches Supports. Some additional elbow supports can be found under: Help Contents Contents Tab Modeling Approaches Modeling Approaches Bend Base supported elbow. Otherwise, having a clear understanding of the 9 different supports in AutoPIPE, how each support behaves and their limitations, a person could model most of the typical pipe support designs used in industry with one or more of the 9 supports at the same node point. With regards to using a flexible or rigid support / anchor, use a flexible support / anchor when you know the flexibility and movement at a support node point. If you do not know the flexibility of a support / anchor, you have 2 choices: 1. model with rigid support / anchor or 2. make an engineering judgement and enter a flexibility value. Due to liability law suits, Bentley cannot not provide design decisions in a given scenario, but will be able to help you understand the difference and how the application functions. For a references about flexible / rigid anchors, see the following online help: Help Contents Contents Tab Modeling Approaches Modeling Approaches Anchor Item #14: When entering Beam Section Properties, the dialog will automatically calculate the "Section Properties" for Shapes = Pipe or Solid pipe based on "Section Dimensions" entered, but will not do that for any other shape selected. Why? Answer: Pipe is a round geometrical shape that is easy to calculate the area for solid circle or hollow circle shape and thus section properties. However other Beam shapes (i.e. M-shape, Channel, Tube, etc..) are more complex shapes with to many unknowns (i.e inside radius, chamfers, etc..) to easily calculate the area and thus section properties. Therefore, only Solid pipe and Pipe shape have their section properties automatically calculated. All other shapes the user must enter in user defined values. Item #15: How to define horizontal spring in AutoPIPE, that is to be added in horizontal direction, to apply the loading necessary to reduce some unwanted displacements. Also the question is how to define/calculate preload (factory setting) in cold conditions, and get final loading in hot conditions... Answer: With of AutoPIPE V8i 09.06.00.19 and lower, according to the online help a spring bearing direction is Vertical only. Therefore a horizontal spring cannot be modeled. A new enhancement has been logged, CAE-CR- 10654: Enable spring support bearing direction to be user-specified. This will be added to a future version of the program. Workaround: None.
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