Pipe Shoe Modelling

RE: Pipe Shoe Modelling

Teck Wong — Tue, 20 Sep 2022 12:50:15 GMT

Thanks.

The attached below is what I'm trying to achieve and to check the pipe shoe is within the manufacturer allowable load limit.

For Pipe Shoe as Guide:

For Pipe Shoe as Clamp/Stop, I will weld the pipe shoe to the support.

Hope these makes more sense on what I am trying to achieve. Thanks.

RE: Pipe Shoe Modelling

Teck Wong — Tue, 20 Sep 2022 12:18:58 GMT

Thanks.

I'm a bit unsure how to model the point(4)to(7),but I would definitely love to learn to find the combined load.

Attached are what I've done to what I know, I've connected the each guides to each end point. However, there is an error analyze the study. Could you please have a look and point me to the correct direction?

/cfs-file/__key/communityserver-discussions-components-files/275801/TRIAL.dat

RE: Pipe Shoe Modelling

Maciej Rydlewicz - CS Softdesk — Mon, 19 Sep 2022 17:52:40 GMT

Some remarks:

1. You added two line stops and element which expands - so forces must be big;

2. In my suggested approach:

2.1 two Guides assembly take over lateral movement, bending along vertical and lateral axes, while

2.2 line stop only takes over axial force.

RE: Pipe Shoe Modelling

Maciej Rydlewicz - CS Softdesk — Mon, 19 Sep 2022 17:48:03 GMT

Hi,

I like the direction you go with modelling.

1. No need to set rigid pipe - Mike described why.

2. If clamps are tight no movement is possible, so the friction factor does not matter unless you know the force acting on the pipe from the clamp... so I advise to...

3. Add a stiff line stop instead.

All three supports combined reflect the expected behaviour of this type of support. We should be able to build support assemblies in AutoPIPE to reflect in the model realistically what we have in piping systems. However, this option is not available in the program. So far we have to 'sculpt'.

4. Add steel member below - make it stiff.

5. Connect all 3 AP supports to one end of this member

6. Another end should anchored. If you want to let it move horizontally - modify anchor data.

7. If you need to take into account - add a short pipe (stiff, zero weight) instead of an anchor. Then Add V-stop to the second end of the pipe with a friction factor appropriate (e.g. 0.3?). Or another AutoPIPE support.

Remember that details are essential and the method mentioned above may or may not be appropriate to your case and requires testing.

You may have a combined structure loading/support reaction ready to use as a result of summing up force in V-stop.

If you are to fix the foot to the secondary support - instead of V-stop insert an Anchor. I believe you know what to do next... :-)

RE: Pipe Shoe Modelling

Mike Dattilio — Mon, 19 Sep 2022 14:59:13 GMT

Greetings,

At this time, you are not modeling in the structure steel. Therefore, your current approach appears to somewhat valid:

A set of guide supports, yes
Suggest to confirm guide support settings (gaps , friction factor, etc..)
Not sure that rigid pipe properties are needed as it is the carrier pipe between the supports. The only reason to model rigid properties is if you assume the pipe between the clamps to have a material where the elastic modulus will be increased by a rigid stiffness factor (typically 1000). The rigid stiffness factor can be modified by selecting Tools > Model Options > Edit Options. Otherwise, model as regular pipe.
If the clamps are so tight that they will resist any movement of the pipe through the support, then model with a higher fiction factor or model a single line stop.

Regards,
Mike Dattilio
Design Analysis Engineering Group
Senior Analyst Bentley Systems Inc
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