Tek-Tips is the largest IT community on the Internet today!

Members share and learn making Tek-Tips Forums the best source of peer-reviewed technical information on the Internet!

Register Log in
  • Congratulations MintJulep on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!

UG-36(a)(1): Twisting moment of elliptical opening 1

Status
Not open for further replies.
InspectorByDay

InspectorByDay

Mechanical
Joined
Mar 30, 2010
Messages
15
Location
US
Question:

Per UG-36(a)(1):

"When the long dimension of an elliptical or obround opening exceeds twice the short dimensions, the reinforcement across the short dimensions shall be increased as necessary to provide against excessive distortion due to twisting moment."

What is the twisting moment being referred to in this?

How/does Compress account for this twisting moment?

Any info would be greatly appreciated. Not sure if this problem is to be approached as a torsional moment from external loads or if it is referring to moments from internal pressure.


 
Sort by date Sort by votes
The twisting moment occurs due to the action of the shell under internal pressure (this is somewhat resisted simply by the presence of the nozzle neck and its moment of inertia). The Code gives no direction on how to analyze this. COMPRESS will report a Deficiency message "UG-36(a)(1): More analysis is required. Additional reinforcement may be necessary as the long opening dimension exceeds twice the short dimension."

For such cases you may wish to use the FEA function built-into COMPRESS to analyze the nozzle and shell.

"Although this forum is monitored by Codeware it is not intended as a venue for technical support and should not be used as the primary means of technical support."

Tom Barsh
Codeware Technical Support
 
Upvote 0 Downvote
Status
Not open for further replies.

Similar threads

C
  • Locked
  • Question Question
UG-34 ASMEVIII
Replies
3
Views
1K
Maslov
Maslov
chaulklate
  • Locked
  • Question Question
Code Case 2901-1
Replies
1
Views
1K
Cobra17
Cobra17
JoshRanch
  • Question Question
Overlapping limits of reinforcement between nozzles N1 and N2 detected - user intervention may be required
Replies
0
Views
3K
JoshRanch
JoshRanch
txcadman
  • Locked
  • Question Question
Compress and UG-45 on old vessels
Replies
1
Views
930
Cobra17
Cobra17
AK8824
  • Locked
  • Question Question
Seismic Design of Columns using NBC 2015
Replies
0
Views
715
AK8824
AK8824

Part and Inventory Search

Sponsor

Back
Top