Expansion Joint & Concentric Mass

Sorry for submitted in Poll( I didn't Noted ur previous Message )

1. For the diameter 1246mm & 8mm thickness in Expansion Joint CAESAR showing CAESAR showing CHECK DIAMETER whether CAESAR have database for this diameter or not.Plz Explain

Probably not. You can check this by reviewing the file \(data directory)\expjt.hed. This is a text file, so open it with NotePad.

In this file, after the text and phone numbers, the 4th numeric line contains the number of diameters addressed, and the 5th line lists the nominal diameters addressed. This data varies based on which vendor database you selected.

All of the expansion joint data was provided by vendors. So if the joint you desire isn't in the database, then it isn't "standard". Call the vendor and ask for the data directly, so you can build the model.

Thanks for ur continuous support sir,

I asked the vendor for the details. The details given by them are

Axial - Rigid
Bending - Rigid
Torsional - Rigid
Lateral - 118.13 kg/mm
Weight - 2000 kg

I gave all the datas by selected Expansion joint Option but when selected rigid option for to give weight CAESAR SHOWING Inconsistent Element defenition attempt. I do no how to give the weight now. Plz help

For a finite length expansion joint, the bending and lateral stiffnesses are releated. So in CAESAR II you can only specify one of them, not both. I'm a little surprised the vendor would give you "rigid" for bending, but then 118.13 kg/mm for lateral. I suggest you use the lateral value and let CAESAR II compute the bending (which will not be rigid).

For the "rigid" stiffnesses, enter 1E12.

You can not call the expansion joint a "rigid element", this is why you are getting the message about "inconsistent element definitions". In CAESAR II, a rigid element is (typically) a valve or a flange.

To include the 2000kg weight, put a rigid end piece on each side of the bellows, and set each weight to 1000kg.

Whether we can give forces at the ends like from intial node of bellow FY1=-1000 kg and the end node of the bellow FY1=-1000 kg instead of rigids.

Yes you can specify the weight as forces, but ...

1) You then need to insure that you put "F1" in every load case that also includes "W" or "WNC".

2) If the model is ever analyzed dynamically, the forces won't be considered, because they will be assumed to be "loads". Therefore this weight will have to be accounted for using the "Lumped Mass" option.

In my opinion, it is much safer and easier to include the weight as "rigid elements".