ABSTRACT
The modal force Fi(¢) is estimated from Fi¢(X)¢(Y); Fi may be estimated as being (3000x the number of people) newtons of force; f is calculated from equation (4.27); and m is the modal mass, which may be estimated by
Table 4.3 Effective modal influence function I( cfJ) for floors Lowest Below Between 5 Between 10 Non-resonance frequency 5 Hz and 10 Hz and 20 Hz condition of resonance 0.1% 1.0 0.30 0.10 0.04 1.0% 1.0 0.44 0.17 0.09 4.0% 1.0 0.60 0.26 0.26
calculating the total mass of the floor and dividing by 9. The value of' is difficult to assess in the absence of measurement - under such a circumstance, it is suggested that a value of 0.01 is used.
