Housner Intensity

The Housner intensity (also referred as spectral intensity) provides a measure of the intensity of the motion as a function of spectral velocity. It is plotted as a function of time. The Duhamel integral method is used in calculation of the acceleration response spectra for computational efficiency, and converted to velocity spectra by multiplying the spectra by the corresponding angular frequency. The Housner intensity is often reported as a single value, however, RSSeismic is able to provide the Housner intensity as a time-history by calculating the response spectrum at each point of an acceleration record. The Housner intensity is calculated using the following equation:

Eqn. 1

where T is the period and ξ is the damping ratio. In RSSeismic, the Housner intensity is calculated assuming a damping ratio of 5%.