Structural Analysis, Si Edition
5th Edition
ISBN: 9781285051505
Author: Aslam Kassimali
Publisher: Cengage Learning
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Chapter 12, Problem 9P
To determine
Find the approximate axial forces, shears, and moments for all members of the frame using portal method.
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1. For the foundation shown below:
Qapp = 60 kips
(Load obtained from
structural engineer)
1.5 ft
G.W.T.
3 ft
Poorly Graded Sand (SP):
Ym
115 pcf (above G.W.T.)
Ysat 125 pcf (below G.W.T.)
c' = 0, ' = 35°
K
Square footing, 4' x 4'
Foundation Dimension Information:
1-ft x 1-ft square concrete column.
1-ft thick "foot" flanges.
Yconc=150 pcf
*Assume weight of reinforcing steel
included in unit weight of concrete.
*Assume compacted backfill
weighs the same as in-situ soil.
Assume this foundation is being designed for a warehouse that had a thorough preliminary soil
exploration. Using the general bearing capacity equation:
a. Calculate the gross applied bearing pressure, the gross ultimate bearing pressure, and
determine if the foundation system is safe using a gross bearing capacity ASD
approach. Please include the weight of the foundation, the weight of the backfill soil,
and the effect of the uplift pressure caused by the presence of the water table in your
bearing capacity…
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Refer to the figure below. Given: L = 7 m, y = 16.7 kN/m², and ø' = 30°.
L
L3
ση
Sand
γ
$'
D
T
LA
L
σε
σε
IN
P
Sand
1. Calculate the theoretical depth of penetration, D.
(Enter your answer to three significant figures.)
D=
m
2. Calculate the maximum moment.
(Enter your answer to three significant figures.)
Mmax
kN-m/m
Chapter 12 Solutions
Structural Analysis, Si Edition
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