Specifies the system design factor. This value is multiplied by the occasional load factor (k) to generate the value of the part factor for loading (f2). If you do not define this value, the software uses the default value of 0.67.
The purpose of the system design factor is to define an acceptable margin of safety between the strength of the material and the operating stresses for the three load cases. These load cases are occasional, sustained including thermal loads, and sustained excluding thermal loads. The following table shows the relationship between the system design factor, the occasional load factor, and f2, along with their default values.
|
Load |
System Design |
Occasional Load |
Part Factor for |
---|---|---|---|---|
Occasional |
Short-term |
0.67 |
1.33 |
0.89 |
Sustained Including Thermal Loads |
Long-term |
0.67 |
1.24 |
0.83 |
Sustained Excluding Thermal Loads |
Long-term |
0.67 |
1.00 |
0.67 |
The part factor for loading f2 is equal to System Design Factor times the Occ Load Factor.