Complete Quadratic Combination (CQC) Rule

Tips & Tricks

The CQC (Complete Quadratic Combination) rule is available in RFEM and RSTAB since version X.06.3039. In the General Data of the model you can activate the CQC rule and for Load Cases of type ‘Earthquake’ there are two new properties available, the ‘Angular frequency’ and the ‘Lehr's damping’.

In the calculation parameters of Result Combinations you can then select the CQC rule. The formulas and additional information how to apply this rule are illustrated in the figure.

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