Earthquake Engineering Research - HKU Libraries - The University ...

409
s
e a ooo
j| soo
y
0
c
l83Hz
,530Hz
V.. Jv JL 7WHI
Acceleration
i 1 i
Roof
Frequency (Hz) 2nd Floor Frequency (Hz)
I
1500
1 i
s s.
^ * 500
5
J
u
3rd Floor
.1 X 1
3
" 80
« a
II 60
II 40
S 20
5 r~*iw^^
2 4 6 8 10 0 2 4 6 3 1
FreqaencvlHz) Shaking T-ible Frequency (H.)
Figure 5: Founer spectra of acceleration response of test frame
Table 1 shows the characteristics of test frame.
TABLE 1.1 TABLE 1.2
MASSES CHARACTERISTICS OF FRAME
TABLE 1.3
CHARACTERISTIS
OF BASE ISOLATION
Roof
SrdFbor
2nd F bor
IstFbor
Total
467
478
478
6 DO
2023
3F
2F
1F
Stiffness(kN/cni)
276
284
354
EfestcOBpfetcementfcni )
174
3 DO
227
Stiffness(kN/cm)
Frctbn Force (kN)
DamphgCoeffbBntWs/cra)
DamphgRatb
NaturalPerbdfeec)
101
0692
OD333
OD37
284
DEVELOPMENT OF MR FLUID
Trial product of MR fluid "#230", which was made on an experimental basis by fourth author of
Bando Chemical Co. LTD., was used for the MR damper. The "#230" is an oil-based fluid and has
good stability. Properties of "#230" are shown in TABLE 2.
TABLE 2
PROPERTIES OF MR FLUID "#230"
Properties
Base fluid
Density
Stability (%)=V(t) / V(0) *100
V(t):sedimental volume after t min :V(0): original sedimental volume
#230
Oil
3.3*10 3 kg/m 3
Approximately 98%
(by volume) after 2*10 4 min.