Topic Options
#74029 - 10/27/19 11:07 PM Error with Max Combination Case
vik Offline
Member

Registered: 04/08/09
Posts: 33
Loc: Bangalore
Hi All,

My CII model has a skewed piping, with a floating anchor in between (say at node 20).

In output, when I extract and compare "local element forces" with "Local Restraints" from a "MAX" combination case. I see that "Axial force" components at this node 20 do not match.

When I compare results of all cases individually(instead of max case), the results match.

Please let me know if there is a bug.. or am i missing something?

Thank you.


Edited by vik (10/27/19 11:13 PM)

Top
#74031 - 10/28/19 06:15 AM Re: Error with Max Combination Case [Re: vik]
Dorin Daniel Popescu Offline
Member

Registered: 06/05/00
Posts: 124
Loc: Middle East
Hi,

This error occurs even for orthogonal restraints (e.g. along main coordinate axes), not only for skewed directions. There are cases when MAX combinations gives different maximum restraints' loads than those found by listing ALL operating cases and identifying maximum absolute values (e.g. Extended Restraint Summary Report).

When such error occurs? I am not aware about a clear template/typical case, but the errors occur in general for those restraints where friction factor is defined not only for vertical restraints, but also for horizontal guiding/stopping restraints.

There were in the past similar inquiries about this issue, Intergraph offered some explanations, but, honestly, till now I am not aware why such errors occur.
It is really frustrating MAX Load Case to be unable to offer reliable restraint summary results...

Regards,
_________________________
Dorin Daniel Popescu

Lead Piping Stress Engineer

Top
#74032 - 10/28/19 08:00 AM Re: Error with Max Combination Case [Re: vik]
vik Offline
Member

Registered: 04/08/09
Posts: 33
Loc: Bangalore
Thanks a lot Sir.


Edited by vik (10/28/19 08:00 AM)

Top



Moderator:  Dave Diehl, Richard Ay 
Who's Online
0 registered (), 49 Guests and 2 Spiders online.
Key: Admin, Global Mod, Mod
December
Su M Tu W Th F Sa
1 2 3 4 5 6 7
8 9 10 11 12 13 14
15 16 17 18 19 20 21
22 23 24 25 26 27 28
29 30 31
Forum Stats
11721 Members
14 Forums
16092 Topics
72137 Posts

Max Online: 191 @ 11/16/19 10:39 AM
Top Posters (30 Days)
Michael_Fletcher 12
vermaccio 8
Chill-N 7
Vanman 7
joeseagle 5