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9. What is the difference between load groups (LG) and load combinations (CO)?
The philosophy of RSTAB and RFEM is to define Load Cases (LC) and then to combine them in either Load Groups (LG) or Load Combinations (CO). The origin of this idea was in RSTAB:

LGs are usually calculated according to 2nd order theory (i.e. a completely new calculation with a matrix from all loads of this LG). COs only read the results of LCs or LGs that have already been calculated and then superpose them according to the criteria and factors. So the difference is that LGs involve a new calculation, COs only process existing results.

RFEM enables an extended approach to the calculation of LCs or LGs, though. One can define the way of analysis for LGs separately via Calculation Parameters. The default setting is Second-Order Analysis, but one can also set the calculation to Linear Analysis there. COs are identical to those of RSTAB, i.e. they only process the results of LCs or LGs that have already been calculated.
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STATISTICS

Person in charge KabrtL
Date 02/24/2006
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Last visit 09/08/2010