Please advice how to actually model Drag Anchors in Underground Pipelines in CAESAR-II.

After you have buried the model, open the input file created by Caesar II during the conversion. Then find the node where you want to add the underground anchor, delete all the soil restraints at that node (the easy way is to double-click on Restraints), then add your anchor in on that node.

Loren,

As per Civil the U/g anchors displaces by say 25 mm then only the soil behind the anchor gets compressed & acts as a Anchor. I had modeled the same way as u have mentioned and also tried giving displacement (25 mm) to the Anchor with CNODE concept so that it functions as a displaced anchor.

By doing this the report sections does not show that the anchor is displaced by 25 mm.

By doing the traditional way of deleting the soil restraints at that node and adding an anchor at that node it becomes a FULL THRUST ANCHOR.

So please advice about DRAG ANCHOR (Anchor getting displaced by 25mm) so that the loads on the anchor are reduced. This effect of displaced anchor is good for civil as it reduces the trust force but bad for pipeline as it increases the stress at bends.

Please advice.

Dear sandeep,

Maybe restraints with gap(linear restraint 25 mm) might help you

I am not sure, pardon me if i am wrong

Did you forget to use D1 in your OPE load case? Your anchor should displace by 25 mm if you input that displacement on the Cnode. Be sure to enter zeroes for all 5 of the other displacements on the Cnode.