Civil Engineering Reference
In-Depth Information
7.2.7 The Case of Frames Braced against Lateral Sway
For all practical purposes, the lateral displacement undergone by shear wall or
braced frame structures is generally significantly smaller than rigidly framed
structures. Consequently, the preceding results presented from the analysis of
rigidly framed earth retaining structures could not be extended to represent the
lateral earth pressure loads developed in the backfill soil retained behind structures
braced against lateral sway.
Thus, for comparison and completeness purposes, two cases of rigid frames
with bay length of 10 feet were modified to include a 12 inch thick concrete shear
wall spanning a single bay to assess the effects of bracing the frames on the
development of lateral earth pressure in the backfill soil.
10
U
hRF
U
hSW
8
6 bays
6
L
b
= 10 ft
φ
4
= 30
o
2
S
c
/S
b
= 1
0
0
0.002
0.004
0.006
0.008
0.01
Horizontal Retaining Wall Movement, U
h
, ft
10
σ
aRF
σ
aSW
Coulomb
ASCE 7-98
K
0
6 bays
8
L
b
= 10 ft
φ
= 30
o
6
S
c
/S
b
= 1
4
2
0
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
'
h
, kips/ft
2
σ
Fig. 7.23
Displacement and Lateral Earth Pressure behind a 6-Bay Shear Wall Structure
