8A. ANALYSIS Part 1: NEW BUILDINGS

CHAPTER 8A 'ANALYSIS' 23 and "importance category" to automatically fill in importance factor "y". In the "Coefficients" field you can modify the default values related to the seismic spectrum by typing in the corresponding fields. The seismic coefficients "qx" and "qz" are filled in by the designer after taking into account all the necessary requirements of the NAC. In the field "Levels HZ" you select the lower and the upper level for application of seismic actions (for buildings with basement and/or staircase termination, etc.). For the fictitious elastic axis and the altitude at 0.8*H, the option is not necessary. The program automatically finds the closest to the building's z0=0,8*H diaphragm level. 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. Finally, the designer has the possibility to enter a value for the angle of the main bending planes, always by activating the corresponding checkbox first. The sign defines the direction of the angle.