Posted by: Goodsalt
Alternate Sustained Load Cases/Occasional - 02/11/16 09:02 AM
Following are load cases I've defined for a model.
CASE 1 (HGR) W
CASE 2 (HGR) W+T1+P1
CASE 3 (OPE) W+T1+P1+H
CASE 4 (Alt-SUS) W+P1+H
CASE 5 (OPE) W+T1+P1+H+WIN1
CASE 6 (OPE) W+T1+P1+H+WIN2
CASE 7 (OPE) W+T1+P1+H+WIN3
CASE 8 (OPE) W+T1+P1+H+WIN4
CASE 9 (SUS) W+P1+H
CASE 10 (SUS) L10=L4,L9 MAX
CASE 11 (OCC) L11=L5-L3 ALG
CASE 12 (OCC) L12=L6-L3 ALG
CASE 13 (OCC) L13=L7-L3 ALG
CASE 14 (OCC) L14=L8-L3 ALG
CASE 15 (OCC) L15=L10+L11 SCALAR
CASE 16 (OCC) L16=L10+L12 SCALAR
CASE 17 (OCC) L17=L10+L13 SCALAR
CASE 18 (OCC) L18=L10+L14 SCALAR
CASE 19 (EXP) L19=L3-L9 ALG
There are three (3) cases defined as SUS stress type - a "normal" sustained case L9, an alternate sustained case L4, and a case that takes the maximum of the previous two, L10, which is then used to determine the OCC stresses for wind cases. CAESAR throws a warning worded as follows: "One of more load cases contain an Alternate SUS/OCC load case". I suspect it is in reference to one or more of the load cases L10 - L18. What if any load cases need to be corrected? Should I even be defining L10, or just using L9 to develop the occasional stresses?
CASE 1 (HGR) W
CASE 2 (HGR) W+T1+P1
CASE 3 (OPE) W+T1+P1+H
CASE 4 (Alt-SUS) W+P1+H
CASE 5 (OPE) W+T1+P1+H+WIN1
CASE 6 (OPE) W+T1+P1+H+WIN2
CASE 7 (OPE) W+T1+P1+H+WIN3
CASE 8 (OPE) W+T1+P1+H+WIN4
CASE 9 (SUS) W+P1+H
CASE 10 (SUS) L10=L4,L9 MAX
CASE 11 (OCC) L11=L5-L3 ALG
CASE 12 (OCC) L12=L6-L3 ALG
CASE 13 (OCC) L13=L7-L3 ALG
CASE 14 (OCC) L14=L8-L3 ALG
CASE 15 (OCC) L15=L10+L11 SCALAR
CASE 16 (OCC) L16=L10+L12 SCALAR
CASE 17 (OCC) L17=L10+L13 SCALAR
CASE 18 (OCC) L18=L10+L14 SCALAR
CASE 19 (EXP) L19=L3-L9 ALG
There are three (3) cases defined as SUS stress type - a "normal" sustained case L9, an alternate sustained case L4, and a case that takes the maximum of the previous two, L10, which is then used to determine the OCC stresses for wind cases. CAESAR throws a warning worded as follows: "One of more load cases contain an Alternate SUS/OCC load case". I suspect it is in reference to one or more of the load cases L10 - L18. What if any load cases need to be corrected? Should I even be defining L10, or just using L9 to develop the occasional stresses?