8A. ANALYSIS Part 1: NEW BUILDINGS

CHAPTER 8A 'ANALYSIS' 31 Define the number of Eigenvalues and the Accuracy, and you are also given the choice of how to superimpose the eigenmodal responses according to either the CQC and CQC(10%) (3.4.3. & C.3.4.3 of the NAC), or by the SRSS Simple Quadratic Parallelism rule. To modify the coefficients for the eccentricities, select the corresponding checkbox and enter the new value on the right. In the same way, the designer can modify the spectra by X, Y and Z by entering his own values in the corresponding fields, as well as the Response Spectrum Participation Coefficients Finally, to update the spectrum for the new parameters, either select the command , or click on the "Response Spectrum" command and within the dialog box, click on "Default". After you have selected the parameters select "OK". to store the parameters and close the dialog box. Finally, within the run window, select the "Automatic Process" command. If there is an error in your study then the analysis process will be interrupted and the corresponding message will be displayed. When the program completes the automatic process green n's will appear next to each stage of the analysis as shown in the figure below.