Hi guys

As I know,
in "Max" combination method with 6 "exp" load cases
allowable stress is from one of 5 load cases...

but I found some strange like below
LC51 : 78.7% (code stress/allowable stress, 198.1Mpa/251.8Mpa)
LC52 : 83.8% (209.7/251.8)
LC53 : 80.1% (201.7/251.8)
LC54 : 82.4% (207.3/251.8)
LC55 : 89.3% (211.2/236.5)
LC56 : 84.5% (199.8/236.5)
LC59 : 122.2% (211.2/172.8)

in this case, I think allowable stress of LC59 should be 236.5Mpa
not 172.8.....as I know, max case's allowable is from the load case which have max ratio(code/allowable)

Please let me know... why 172.8 can be specified as allowable of max load case...

below data is from CII
==============================================================
CAESAR II 2019 Ver.11.00.00.4800, (Build 190424) Date: FEB 13, 2020 Time: 17:31
Job Name: AS BUILD OPERTING CASE 10
Licensed To: Licensed To: Edit name in \company.txt
STRESS SUMMARY (LEGACY) REPORT: Highest Stresses Mini Statement
Various Load Cases

LOAD CASE DEFINITION KEY

CASE 51 (EXP) L51=L19-L27
CASE 52 (EXP) L52=L20-L27
CASE 53 (EXP) L53=L21-L28
CASE 54 (EXP) L54=L22-L28
CASE 55 (EXP) L55=L23-L29
CASE 56 (EXP) L56=L24-L29
CASE 59 (EXP) L59=L51,L52,L53,L54,L55,L56

Note: This report indicates generic stresses summary. Currently, CAESAR II does not have summary for code-defined stresses.
Piping Code: B31.3 = B31.3 -2016, Jan 31, 2017


CODE STRESS CHECK PASSED : LOADCASE 51 (EXP) L51=L19-L27

Highest Stresses: (N./sq.mm. ) LOADCASE 51 (EXP) L51=L19-L27
Ratio (%): 78.7 @Node 5811
Code Stress: 198.1 Allowable Stress: 251.8
Axial Stress: 3.4 @Node 169
Bending Stress: 195.7 @Node 5811
Torsion Stress: 20.9 @Node 100
Hoop Stress: 0.0 @Node 18
Max Stress Intensity: 229.7 @Node 5811

CODE STRESS CHECK PASSED : LOADCASE 52 (EXP) L52=L20-L27

Highest Stresses: (N./sq.mm. ) LOADCASE 52 (EXP) L52=L20-L27
Ratio (%): 83.3 @Node 5811
Code Stress: 209.7 Allowable Stress: 251.8
Axial Stress: 3.2 @Node 169
Bending Stress: 207.4 @Node 5811
Torsion Stress: 20.4 @Node 100
Hoop Stress: 0.0 @Node 18
Max Stress Intensity: 243.2 @Node 5811

CODE STRESS CHECK PASSED : LOADCASE 53 (EXP) L53=L21-L28

Highest Stresses: (N./sq.mm. ) LOADCASE 53 (EXP) L53=L21-L28
Ratio (%): 80.1 @Node 5811
Code Stress: 201.7 Allowable Stress: 251.8
Axial Stress: 3.3 @Node 169
Bending Stress: 199.3 @Node 5811
Torsion Stress: 37.8 @Node 6269
Hoop Stress: 0.0 @Node 18
Max Stress Intensity: 233.8 @Node 5811

CODE STRESS CHECK PASSED : LOADCASE 54 (EXP) L54=L22-L28

Highest Stresses: (N./sq.mm. ) LOADCASE 54 (EXP) L54=L22-L28
Ratio (%): 82.4 @Node 5811
Code Stress: 207.3 Allowable Stress: 251.8
Axial Stress: 3.0 @Node 179
Bending Stress: 205.0 @Node 5811
Torsion Stress: 37.1 @Node 6269
Hoop Stress: 0.0 @Node 18
Max Stress Intensity: 240.4 @Node 5811

CODE STRESS CHECK PASSED : LOADCASE 55 (EXP) L55=L23-L29

Highest Stresses: (N./sq.mm. ) LOADCASE 55 (EXP) L55=L23-L29
Ratio (%): 89.3 @Node 5080
Code Stress: 211.2 Allowable Stress: 236.5
Axial Stress: 4.2 @Node 5789
Bending Stress: 210.3 @Node 5080
Torsion Stress: 37.6 @Node 6269
Hoop Stress: 0.0 @Node 18
Max Stress Intensity: 244.9 @Node 5080

CODE STRESS CHECK PASSED : LOADCASE 56 (EXP) L56=L24-L29

Highest Stresses: (N./sq.mm. ) LOADCASE 56 (EXP) L56=L24-L29
Ratio (%): 84.5 @Node 5080
Code Stress: 199.8 Allowable Stress: 236.5
Axial Stress: 4.0 @Node 5789
Bending Stress: 198.9 @Node 5080
Torsion Stress: 36.3 @Node 6269
Hoop Stress: 0.0 @Node 18
Max Stress Intensity: 231.6 @Node 5080

CODE STRESS CHECK FAILED : LOADCASE 59 (EXP) L59=L51,L52,L53,L54,L55,L56

Highest Stresses: (N./sq.mm. ) LOADCASE 59 (EXP) L59=L51,L52,L53,L54,L55,L56
Ratio (%): 122.2 @Node 5080
Code Stress: 211.2 Allowable Stress: 172.8
Axial Stress: 4.2 @Node 5789
Bending Stress: 210.3 @Node 5080
Torsion Stress: 37.8 @Node 6269
Hoop Stress: 0.0 @Node 18
Max Stress Intensity: 244.9 @Node 5080
==============================================================

I need to correct..as below

As I know,
in "Max" combination method with 6 "exp" load cases
allowable stress is from one of 6 load cases...

Be careful, the MAX cases for stress reports may not offer realistic results. The failure criteria for different load cases may be different, leading to stress components (bending, axial, etc) from cases that did not contribute to the maximum code stress. There are further complications (including circular dependencies) with attempting to perform a MAX summary of combination load cases.

We are currently developing a set of guideline/suggestions for using the MAX load case option. Please open an SR on Smart Support so a detailed explanation can be sent when it is available.

thank you Richard