Civil Engineering Reference
In-Depth Information
The lateral earth pressures developed behind the rigid frames at the end of the
last expansion cycle are shown in Fig. 9.40. The magnitudes of said pressures are
found to vary between the lower bound pressure distribution determined in
accordance with Coulomb's active earth pressure theory, and the upper bound soil
pressure stipulated in ASCE 7-98.
Note here, that the results presented for the single and 3-bay frames on this
group of RFERS are based on a numerical analysis carried to the first expansion
cycle only, since failure of the soil mass occurs subsequently.
50
σ
hen1
σ
hen3
σ
hen6
σ
hen10
σ
hen15
σ
hen20
Coulomb
ASCE 7-98
BOCA, SBC, IBC
K0
40
30
L
b
= 10 ft
φ
20
= 30
o
10
S
c
/S
b
= 1
0
0
0.5
1
1.5
2
2.5
3
3.5
σ
h
, kips/ft
2
Fig. 9.40
Lateral Earth Pressure at Expansion Cycle (φ = 30º, All Bays, L
b
= 10 ft,
S
c
/S
b
= 1)
50
M
bn1
M
bn3
M
bn6
M
bn10
M
bn15
M
bn20
40
30
L
b
= 10 ft
φ
20
= 30
o
10
S
c
/S
b
= 1
0
-300
-240
-180
-120
-60
0
60
120
Retaining Wall Moment, M, kips-ft
Fig. 9.41
Retaining Wall Moment at Backfill Stage (φ = 30º, All Bays, L
b
=10 ft, S
c
/S
b
= 1)
