Example 1
The static load cases are:
1 = W+P1+D1+T1+H (OPE)
2 = W+P1+H (SUS)
3 = L1 - L2 (EXP)
The dynamic load cases are:
1 = Operating Basis Earthquake
2 = 1/2 the Operating Basis Earthquake
Combine the operating basis earthquake stresses with the sustained static stresses:
Load Case |
Factor |
---|---|
STATIC2 |
1.0 |
DYNAMIC1 |
1.0 |
or
Load Case |
Factor |
---|---|
S2 |
1 |
D1 |
1 |
Example 2
The static load cases are:
1 = W + P1 (For hanger design)
2 = W + P1 + D1 + T1 (For hanger design)
3 = W + P1 + D1 + T1 + H (OPE)
4 = W + P1 + H (SUS)
5 = L3 - L4 (EXP)
There is one dynamic load case. Create an occasional case that is the sum of the sustained and the dynamic stresses using the SRSS combination method and the ABS combination method. Additionally, combine the expansion static case and the dynamic case using the SRSS combination method. This is a total of three combination load cases. The first two static hanger design load cases cannot be used in a combination case.
* COMBINATION CASE 1:
* SRSS COMBINATION OF SUSTAINED AND DYNAMIC CASES
STRESSTYPE (OCC), COMBINATION (SRSS)
Load Case |
Factor |
---|---|
STATIC4 |
1 |
DYNAMIC1 |
1 |
* COMBINATION CASE 2:
* ABS COMBINATION OF SUSTAINED AND DYNAMIC CASES
STRESSTYPE (OCC), COMBINATION (ABS)
Load Case |
Factor |
---|---|
STATIC4 |
1 |
DYNAMIC1 |
1 |
* COMBINATION CASE 3:
* SRSSCOMBINATION OF EXPANSION AND DYNAMIC CASES
STRESSTYPE (OCC), COMBINATION (SRSS)
Load Case |
Factor |
---|---|
STATIC5 |
1 |
DYNAMIC1 |
1 |
Stress type and combination are defined on the Directive Builder dialog box. For more information, see Directive Builder.
Example 3
The static load cases are:
1 = W+T1+P+D1+H (OPE)
2 = W+P+H (SUS)
3 = U1 (OCC) Static seismic simulation
4 = L1-L2 (EXP)
5 = L2+L3 (OCC) (SCALAR)
Create an SRSS combination of the static seismic case and both the sustained and operating static cases:
* COMBINATION CASE 1:
COMBINATION (SRSS), STRESSTYPE (OCC)
Load Case |
Factor |
---|---|
STATIC2 |
1 |
STATIC3 |
1 |
* COMBINATION CASES 2:
COMBINATION (SRSS), STRESSTYPE (OCC)
Load Case |
Factor |
---|---|
STATIC1 |
1 |
STATIC3 |
1 |
Example 4
The static load cases are:
1 = W+P1 (Hanger design restrained weight case)
2 = W+T1+P1+D1 (Hanger design load case #1)
3 = W+T2+P1+D1 (Hanger design load case #2)
4 = WNC+P1 (Hanger design actual cold loads)
5 = W+T1+H+P1+D1 (OPE)
6 = W+P1+H (SUS)
7 = L5-L6 (EXP)
Combine the static sustained stresses with 1/2 the shock case 1 results, 1/2 the shock case 2 results, and 1.333 times the shock case 3 results. The combination method is SRSS. For a second combination case, combine the static sustained stresses with 1/2 the shock case 4 results, 1/2 the shock case 5 results, and 1.333 times the shock case 6 results.
* COMBINATION CASE 1:
COMBINATION (SRSS)
Load Case |
Factor |
---|---|
STATIC6 |
1 |
DYNAMIC1 |
1/2 |
DYNAMIC2 |
1/2 |
DYNAMIC3 |
1.333 |
or
COMBINATION (SRSS)
Load Case |
Factor |
---|---|
S6 |
1 |
D1 |
0.5 |
D2 |
0.5 |
D3 |
1.333 |
* COMBINATION CASE 2:
COMBINATION (SRSS)
Load Case |
Factor |
---|---|
STATIC6 |
1 |
DYNAMIC4 |
0.5 |
DYNAMIC5 |
0.5 |
DYNAMIC6 |
1.333 |