34. DSHD (Di l d d S iDSHD (Displace dependent Semi-
active Hydraylic Damper)y y p )
• A. Hydraulic Jack,
• B. Directional Valve,
B
B
• C. Check Valve,
• D. Relief Valve
• E. Connected to Structure
CC
CC E. Connected to Structure
• F. Connected to Bracing1 2 4 3
A
E F
A
E F
D D
E F
34
D D
37. S l l h dDSHD control algorithm and
typical hysteretic loopsyp y p
R i t t F
Detect relative movement
direction of damper connectors
Resistant Force
max. (overflow) force
Movement, RIGHT?Movement, RIGHT?
Displ
Resistant force
RIGHT
Resistant force
LEFT
Displ.
YES NO
39. The reduction percentages of theThe reduction percentages of the
displacement for the different relief pressures
and Kobe earthquake with various PGAand Kobe earthquake with various PGA
Displacement Reduction Percentage, Kobesp ace e t educt o e ce tage, obe
95
100
80
85
90
rcentage,%
60
65
70
75
eductionPer
5KN Relief
50
55
60
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7
Re
10KN Relief
15KN Relief
39
Peak Ground Acceleration, G
40. Th d ti t f th l tiThe reduction percentages of the acceleration
for the different relief pressures and Kobe
earthquake with various PGAearthquake with various PGA
Acceleratio n R ed u ctio n P ercen tag e, K o b eg
8 0
1 0 0
%
6 0
8 0
rcentage,%
2 0
4 0
ductionPer
5K N Relief
-2 0
0
0 0 1 0 2 0 3 0 4 0 5 0 6 0 7
Re
5K N Relief
10K N Relief
15K N Relief
40
0 0 .1 0 .2 0 .3 0 .4 0 .5 0 .6 0 .7
P eak Ground Ac c eleration, G
41. ASHD (Accumulated Semi-activeASHD (Accumulated Semi-active
Hydraylic Damper)
I it ibl t lIs it possible to recyccle
the dissipated energy?
41
42. 2. ASHD (Accumulated Semi-active2. ASHD (Accumulated Semi active
Hydraylic Damper)
• A. Hydraulic Jack,
• B. Directional Valve,
B
B
• C. Check Valve,
• D. Relief Valve
• E. Connected to Structure
CC
CC E. Connected to Structure
• F. Connected to Bracing1 2 4 3
A
E F
A
E F
D D
E F
42
D D
43. AS l l h dASHD control algorithm and
typical hysteretic loopsyp y p
Resistant Force
Detect relative movement direction of damper
connectors
Resistant Force
max. (overflow) force
Movement, RIGHT?Movement, RIGHT?
Displ.
Resistant force
RIGHT
Resistant force
LEFT
YES NO
44. Element test results
• ASHD-15mm-0 2Hz-38KN-Fix• ASHD 15mm 0.2Hz 38KN Fix
40
60
20
40
KN
-20
0
-20 -10 0 10 20
Force,K
-40
-60
Displacement, mm
45. SDOF Shaking table testSDOF Shaking table test
Brace
Sensors
ASHD
Sh ki t blShaking table