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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RFEM Main Program
RFEM 5.xx

Main Program

Structural engineering software for finite element analysis (FEA) of planar and spatial structural systems consisting of plates, walls, shells, members (beams), solids and contact elements

RSTAB Main Program
RSTAB 8.xx

Main Program

The structural engineering software for design of frame, beam and truss structures, performing linear and nonlinear calculations of internal forces, deformations, and support reactions