Civil Engineering Reference
In-Depth Information
3000
-500
2500
-1000
2000
1500
-1500
1000
-2000
500
-2500
0
0
0.02
0.04
0.06
0.08
0.1
0
0.01
0.02
0.03
0.04
Displacement (m)
Figure 8.18
Base shear of modal SDOF systems: (a) 2
nd
model; (b) 3
rd
model.
Displacement (m)
(a)
(b)
150
0.8
Y
1
(
t
)
Y
1
(
t
)
0.6
100
0.4
50
0.2
0
0
-0.2
-50
-0.4
-100
-0.6
-150
-0.8
0
10
20
30
0
10
20
30
Time (s)
Time (s)
(c)
(d)
8
0.3
Y
2
(
t
)
Y
2
(
t
)
6
0.2
4
0.1
2
0
0
-2
-0.1
-4
-0.2
-6
-8
-0.3
0
10
20
30
0
10
20
30
Time (s)
Time (s)
Figure 8.19
Displacement and acceleration responses of the first three modal SDOF systems: (a) 1
st
modal displacement; (b) 1
st
modal acceleration; (c) 2nd modal displacement; (d) 2nd modal acceleration;
