Table 5: Dependence of modal frequencies on PRA.

ModeDirectionModel typeModal frequency (y)–PRA (x) relationship(*)

Building A

1stXP/flexible base(**) 0.80
Flexible base 0.59
YP/flexible base 0.53
Flexible base 0.40
2ndXP/flexible base 0.59
Flexible base 0.34
YP/flexible base 0.47
Flexible base 0.33
3rdXP/flexible base 0.63
Flexible base 0.65
YP/flexible base 0.51
Flexible base 0.52

Building B

1stXP/flexible base 0.57
Flexible base 0.55
YP/flexible base 0.60
Flexible base 0.59
2ndXP/flexible base 0.69
Flexible base 0.43
YP/flexible base 0.69
Flexible base 0.43
3rdXP/flexible base 0.51
Flexible base 0.58
YP/flexible base 0.51
Flexible base 0.56

(*)Modal frequency in units of Hz, PRA in units of g.
(**)P/flexible base = pseudoflexible base.