The default setting is to use the Peak Harmonic SRSS Combination (faster) calculation option for the resonant response. This is generally the fastest combination to get reasonable results calculated for the entire floor. This method is appropriate for most concrete floors and is recommended for daily design use.

The default setting for the for Maximum distance from excitation node to calculate response property is 10 ft (3.5m), which should be suitable for most models. Increasing the distance will increase the calculation time.

For structures that are vibrationally sensitive or if a higher degree of accuracy is desired, the Complete Harmonic Superposition (slower) calculation option is recommended. Because this method is computationally expensive, the total calculations time is significantly longer than run times using the Peak Harmonic SRSS Combination (faster) method. Drawing excitation areas to take advantage of known areas of excitation, like corridors and hallways, is one way to reduce calculation time. Since the lateral and angular components are rarely critical for floor vibrations, using the option to include those degrees of freedom is not normally recommended.