Civil Engineering Reference
In-Depth Information
E
G
=
(
)
2
1
+
ν
30
A
=
0
3
1
l
+
c
I
I
(
)
n
+
1
n
c
b
l
l
b
b
c
b
The lateral stiffness of the single story frames analyzed are calculated based on
Eq. 7.3 and presented in Table 7.2 below.
Table 7.2
Lateral Stiffness of Single Story Frames (per foot of width of structure)
Frame Mark
Number of Bays
Bay Length (ft)
S
c
/S
b
K
L
(kip/ft/ft)
F1
1
10
1
405
F2
3
10
1
914
F3
6
10
1
1455
F4
10
10
1
2061
F5
15
10
1
2761
F6
20
10
1
3436
F7
1
10
4
1718
F8
3
10
4
4705
F9
6
10
4
9135
F10
10
10
4
15031
F11
15
10
4
22395
F12
20
10
4
29759
F13
1
20
1
227
F14
3
20
1
574
F15
10
20
1
1472
F16
1
20
4
1031
F17
3
20
4
2925
F18
10
20
4
9439
As shown in Table 7.2, the lateral stiffness (per foot of structure) of frames F9
through F12, and F18, are substantially larger than the rest of the structures. Those
frames have also shown the largest earth pressure developed in the backfill soil as
illustrated in Fig.7.5. In fact, the lateral earth pressure developed behind said
frames is slightly larger than the soil load prescribed by ASCE 7-98, for at least
half the height of the structure.
