Daniel2010
Petroleum
Hy everyone!
I'm a beginner in using FEA, so please anyone help me with the following task: "to find the stresses in the roof plates on the supporting legs condition."
I'm trying to model a floating roof having a diameter of 22725 mm. It is also supported by 90 pieces of 4"OD pipes with reinforcing pads. The roof plates are 5 mm thickness.
I tried to model the roof with SHELL181 elements and the legs with pipe beams. When I run the aplication I receive the following message:
"The value of UY at node 5308 is 2.169...E+10. It is greater than the curent limit of 1000000.This generally indicates rigid body motion as a result of an unconstrained model. Verify that your model is properly constrained."
This node is somewhere in the middle of a plate.I modelled the whole roof.I anchored the legs at the base.
I don't know what to do next to solve the problem.
Any help will be very appreciated.
Dan
I'm a beginner in using FEA, so please anyone help me with the following task: "to find the stresses in the roof plates on the supporting legs condition."
I'm trying to model a floating roof having a diameter of 22725 mm. It is also supported by 90 pieces of 4"OD pipes with reinforcing pads. The roof plates are 5 mm thickness.
I tried to model the roof with SHELL181 elements and the legs with pipe beams. When I run the aplication I receive the following message:
"The value of UY at node 5308 is 2.169...E+10. It is greater than the curent limit of 1000000.This generally indicates rigid body motion as a result of an unconstrained model. Verify that your model is properly constrained."
This node is somewhere in the middle of a plate.I modelled the whole roof.I anchored the legs at the base.
I don't know what to do next to solve the problem.
Any help will be very appreciated.
Dan