Civil Engineering Reference
In-Depth Information
The results for frames with bay length of 20 feet are shown in Fig.7.18. The
lateral earth pressure developed behind the majority of the frames in the figure
was reasonably comparable to Coulomb's active earth pressure, and to the soil
load prescribed by SBC, BOCA an IBC.
40
σ
hn1
σ
hn3
σ
hn10
Coulomb
ASCE 7-98
BOCA, SBC, IBC
K
0
35
30
25
20
L
b
= 20 ft
φ
15
= 30
o
10
S
c
/S
b
= 1
5
0
0
0
1
1
2
2
3
40
σ
hn1
σ
hn3
σ
hn10
Coulomb
ASCE 7-98
BOCA, SBC, IBC
K
0
35
30
25
20
L
b
= 20 ft
φ
15
= 30
o
10
S
c
/S
b
= 4
5
0
0
0.5
1
1.5
2
2.5
3
σ
h
, kips/ft
2
Fig. 7.18
Lateral Earth Pressure behind Four Story Frames (
L
b
= 20 ft,
φ
= 30º)
7.2.5.2 Backfill Soil with 40º Internal Friction Angle
The analysis results for frames retaining the backfill soil with 40º internal friction
angle are shown in Fig.7.19. The relative magnitude and distribution of the lateral
earth pressure developed behind the four-story frames are similar to their
counterparts presented earlier for the same group of three-story frames.
Said results are also generally in-line with the remainder of the analysis
presented.
