EI 02C097
01 Jul 97
Table C-3 (Concluded)
Line
Input Parameters
Format Statement
6
NEGATIVE UPWARD
Load-displacement behavior for zero soil movement in upward direction for IJ points
7
Same as item 5
8
STRUC LOAD(LB)
Load applied on top of shaft, pounds
SOILP(PSF)
Pressure applied on top of adjacent soil, psf
ACTIVE DEPTH
Depth of soil beneath ground surface subject to soil heave, ft
9
BELL RESTRAINT
Restraining resistance of bell, pounds
10
FIRST ESTIMATE
Initial calculations of pullout resistance prior to iterations for structural loads less than zero,
pounds
11
LOAD-DISPLACE
Load-shaft movement distribution for given structural load
12
EFFECTS OF ADJ
Effects of soil movement considered in load-displacement behavior
13
INITIAL BASE
Initial calculation of force at bottom of shaft prior to iterations
14
DISPLACEMENT
Displacement at bottom of shaft after 100 iterations, inches
FORCE=
Force at bottom of shaft, pounds after 100 iterations, pounds
15
ITERATIONS
Total number of iterations to converge to solution
16
DEPTH(FT)
Depth, feet
LOAD(LB)
Load at given depth, pounds
SHAFT MVMT(IN.)
Shaft displacement, inches
SOIL MVMT(IN.)
Soil movement, inches
(Sheet 3 of 3)
(2) Load-transfer models. The Seed and Reese
is approximately 1.8 relative to total pile capacity. The
skin friction and Reese and Wright base load-transfer
program does not add the vertical plunging failure liens
models were selected (K = 2). Two points for the
to the curves in Figure C-3a, which leaves the calculated
elastic modulus of the shaft concrete were input into the
displacement load relationships nearly linear.
program.
(b) The distribution of load with depth (Figure C-
(3) Results. The results are plotted in Figure C-3
3b) is representative of downdrag indicated in Figure 3-
for a downward applied load of 150 kips. Results of the
21. The load on the shaft base is nearly 300 kips or
computation placed in file LTROUT.TXT are illustrated
double the applied load at the ground surface.
in Table C-7.
(c) The shaft will settle approximately 1 inch, while
(a) Total and base ultimate bearing capacity (Fig-
the soil settles about 2 inches at the ground surface (Fig-
ure C-3a) is about 550 and 880 kips, respectively. Base
ure C-3c). The soil is heaving near the ground surface,
and
total capacity is about 200 and 500 kips,
which counters the settlement from downdrag. Maximum
respectively, if settlement is limited to 0.5 inch. The FS
settlement is about 3.5 inches at 10 feet of depth.
C-8
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