The results of a load test on a 0.45-m-diameter, 50-m-deep concrete pile are shown in the table below. The pile has a st
Posted: Thu May 05, 2022 12:32 pm
The results of a load test on a 0.45-m-diameter, 50-m-deep
concrete pile are shown in the table below. The pile has a steel
ratio of 0.02, and the 28-day compressive strength of the concrete
is 3 × 104 kPa. The displacements were measured at the
pile head.
a. use Davisson method to calculate the ultimate pile load
capacity and indicate it on the curve.
b. use Brinch-Hansen 90% criteria to calculate the ultimate pile
load capacity
c. A strain gauge was also instrumented at the bottom of the
test pile. At the average ultimate pile load capacity, a strain of
1.5 ×10−4 was measured. Compute the average unit side
friction resistance 𝑓𝑠 and the unit toe bearing
resistance 𝑓'n
Load (kN)
Displacement (mm)
0
0.0
200
1.3
350
2.5
670
5.1
870
7.6
1070
10.2
1250
12.7
1400
15.2
1500
17.8
1600
20.3
1700
22.9
1750
25.4
1780
27.9
1810
30.5
1830
33.0
1860
35.6
1870
38.1
1880
40.6
1890
43.2
1900
45.7
1905
47.0
concrete pile are shown in the table below. The pile has a steel
ratio of 0.02, and the 28-day compressive strength of the concrete
is 3 × 104 kPa. The displacements were measured at the
pile head.
a. use Davisson method to calculate the ultimate pile load
capacity and indicate it on the curve.
b. use Brinch-Hansen 90% criteria to calculate the ultimate pile
load capacity
c. A strain gauge was also instrumented at the bottom of the
test pile. At the average ultimate pile load capacity, a strain of
1.5 ×10−4 was measured. Compute the average unit side
friction resistance 𝑓𝑠 and the unit toe bearing
resistance 𝑓'n
Load (kN)
Displacement (mm)
0
0.0
200
1.3
350
2.5
670
5.1
870
7.6
1070
10.2
1250
12.7
1400
15.2
1500
17.8
1600
20.3
1700
22.9
1750
25.4
1780
27.9
1810
30.5
1830
33.0
1860
35.6
1870
38.1
1880
40.6
1890
43.2
1900
45.7
1905
47.0