Applies To Product(s): AutoPIPE, Version(s): 2004, XM, & V8i Environment: N/A Area: Modeling Subarea: Original Author: Bentley Technical Support Group 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: Different Type of supports in AutoPIPE Item #2: Available AutoPIPE online Help Example Methods for Modeling Supports with related FAQ's. Item #3: Building Structures First, add structural steel cross-sections properties into a model: Use the Beam Section Properties dialog... Enter a Section Id and configure the dialog as needed. Press Apply and then OK button to complete the process. Create a new Beam Section Id with different properties as needed for modeling. To insert a new beam into the model: Use the Insert > Beam Dialog... Select the correct Section ID from the drop down list of configured Beam Section Properties added above. NOTE : Beam assemblies can be copy/pasted into the model (connected or unconnected). 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. Item #16: Questions about AutoPIPE Support type = V-STOP: Q1. Do we have any control to adjust V-Stop support stiffness (or) always it takes (default) rigid value. Answer: No, an AutoPIPE V-stop has rigid stiffness setting. If you wish to consider a V-stop with support stiffness, select Support type = Incline. Q2. If I want to arrest all the three directions then I have to add two more Incline supports perpendicular along the horizontal directions with 0mm Gap. Is it right way to add an anchor to avoid these three supports..? Answer: .Open any support dialog screen and press the Help button. The Help information for supports will appear, showing a grid listing each support used in AutoPIPE with a description and respective bearing directions. A support may be added at any point in the piping (or framing) system, and more than one support is allowed at a point. Knowing this, combine supports as needed to mimic your piping support in AutoPIPE. To answer the specific question above, an incline support bearing direction is user specified. One solution would be to add an incline support for each global axis direction, and yes, another solution would be to insert a single anchor with Trans. Stiff. set as needs and Rot. Stiff. set = 0.00 in all 3 directions. Or insert Rot. Stiff. values if it was decided to also control rotating resistance.
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