Fundamentals of Geotechnical Engineering (MindTap Course List)
5th Edition
ISBN: 9781305635180
Author: Braja M. Das, Nagaratnam Sivakugan
Publisher: Cengage Learning
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Chapter 8, Problem 8.13P
To determine
Find the upward seepage force per unit volume of soil.
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a. Determine the effective area for the case shown in the figure below. Suppose that l = 4 in.
For L5 x 5 x 5/8: Ay = 5.90 in.², = 1.47 in.
L5 × 5 × 58
Weld
(Express your answer to three significant figures.)
A₂ = 6.25
in.2
b. Determine the effective area for the case shown in the figure below. Suppose that = 4 in.
PL38 x 4
Weld
(Express your answer to three significant figures.)
A₁ =
in.2
c. Determine the effective area for the case shown in the figure below.
PL³/8 x 5
Weld
(Express your answer to three significant figures.)
in, 2
A₁ =
d. Determine the effective area for the case shown in the figure below.
PL/2 × 51/2
оо
3/4-in.-diam. bolts
(Express your answer to three significant figures.)
A₂ =
in.2
e. Determine the effective area for the case shown in figure below.
PL³½ x 6
7/8-in.-diam. bolts
(Express your answer to three significant figures.)
Ae
in.2
An American Standard Channel shape must resist a factored tensile load. The length is 15 ft, and there will be two lines of
7/8-in. diameter bolts in the web, as shown in the figure below. Estimate the shear lag factor U to be 0.85. (In a practical
design, once the member and bolt layout are selected, the value of U could be computed and the member design could be
revised if necessary.) Use A36 steel. For the steel Fy = 36 ksi and F₁ = 58 ksi. Try the tension members given in the
table below.
Tension member A, (in.²) tw (in.) ry (in.)
C10 x 20
5.87
0.379 0.690
C3 × 6
1.76
0.356 0.413
C6 × 8.2
2.39
0.200
0.536
C5 × 9
2.64
0.325
0.486
Bolt lines
Select an American Standard Channel shape to resist a factored tensile load of 120 kips.
A) C10 × 20
B) C3 × 6
C) C6 x 8.2
D) C5 x 9
-Select- V
What is the required gross area?
(Express your answer to three significant figures.)
Ag
=
in.2
What is the required effective area?
(Express your answer to three significant figures.)
Ae
=
in.2
What is…
It proposed to provide pile foundation for a heavy column; the pile group consisting of 4 piles,
placed at 2.0 m centre to centre, forming a square pattern. The under-ground soil is clay, having
Cu at surface as 60 kN/m², and at depth 10 m, as 100 kN/m². Compute the allowable column
load on the pile cap with factor of safety of 3.0, if the piles are circular having diameters 0.5 m
each and length as 10 m.
Chapter 8 Solutions
Fundamentals of Geotechnical Engineering (MindTap Course List)
Ch. 8 - Prob. 8.1PCh. 8 - Prob. 8.2PCh. 8 - Prob. 8.3PCh. 8 - Prob. 8.4PCh. 8 - Prob. 8.5PCh. 8 - Prob. 8.6PCh. 8 - Prob. 8.7PCh. 8 - Prob. 8.8PCh. 8 - Prob. 8.9PCh. 8 - The soil profile at a site consists of 10 m of...
Ch. 8 - Prob. 8.11PCh. 8 - Prob. 8.12PCh. 8 - Prob. 8.13PCh. 8 - Prob. 8.14PCh. 8 - A sand has Gs = 2.66. Calculate the hydraulic...Ch. 8 - Prob. 8.16PCh. 8 - A point load of 1000 kN is applied at the ground...Ch. 8 - Point loads of magnitude 9, 18, and 27 kN act at...Ch. 8 - Refer to Figure 8.13. The magnitude of the line...Ch. 8 - Refer to Figure 8.24. Determine the vertical...Ch. 8 - Consider a circularly loaded flexible area on the...Ch. 8 - A flexible circular footing of radius R carries a...Ch. 8 - The plan of a flexible rectangular loaded area is...Ch. 8 - Refer to Figure 8.26. The circular flexible area...Ch. 8 - Refer to Figure 8.27. The flexible area is...Ch. 8 - Prob. 8.26CTPCh. 8 - Prob. 8.27CTP
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