Cqc abbreviation stands for complete quadratic combination. About quadratic combinations robot structural analysis. The cqc method degenerates into the srss method for systems with well. For a discrete system, having ndegrees of freedom, the equations of. The complexcompletequadraticcombination ccqc method for. Srss method for srss method, the correlation coefficients equal. These individual modal responses are combined using one of the square root of the sum of squares srss, the complete quadratic combination cqc, the asce498 asce, the ten percent ten, or the absolute abs methods to obtain the resultant responses. Complete quadratic combination method cqc and double sum. Seismic analysis is a subset of structural analysis and is the calculation of the response of a building or nonbuilding structure to earthquakes. The cqc complete quadratic combination rule is available in rfem and rstab since version x. Earthquake response spectrum analysis of offshore platforms. For a multidegree of freedom system mdof without damping, free vibration no applied loads is described by eq. Pdf the responsespectrum mode superposition method is widely used for. The cqc method degenerates into the srss method for systems with wellspaced natural frequencies.

What is the abbreviation for complete quadratic combination. A complete quadratic combination cqc method is proposed which reduces errors in modal combination in all examples studied. 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 lehrs damping. I have some terms regarding a regulation on seismicresistant buildings i have been looking for and either not sure or cant find it. Modal combination rule in dynamic analysis ofbuildings has been revised. Complete quadratic combination method cqc and double sum methods dsm. The complex completequadraticcombination ccqc method for seismic response of nonclassically damped linear mdof system article pdf available january 2004 with 677 reads how we measure reads. In using this method, the complete quadratic combination cqc is adopted for. The comparative performance of seismic response spectrum. Development of a seismic design method based on response. This method is similar to cqc, but is slightly more. It is part of the process of structural design, earthquake engineering or structural assessment and retrofit see structural engineering in regions where earthquakes are prevalent as seen in the figure, a building has the potential to wave back. The modal response is determined by means of the following formula. Seismic analysis is a subset of structural analysis and is the calculation of the response of a.

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