Principles of Foundation Engineering (MindTap Course List)
9th Edition
ISBN: 9781337705028
Author: Braja M. Das, Nagaratnam Sivakugan
Publisher: Cengage Learning
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Chapter 11, Problem 11.3P
Repeat Problem 11.1 based on LRFD using the following factors:
load factor for dead load = 1.25
load factor for live load = 1.75
strength reduction factor on the ultimate bearing capacity = 0.50
11.1 A continuous foundation is required in a soil where
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A strip footing is to be designed to support a dead load of 500 kN/m and an imposed load of 300 kN/m at a depth of 0.7 m in a gravelly sand. Characteristic values of the shear strength parameters are c' = 0 and ϕ' =40˚.
(a) Determine the required width of the footing if a factor of safety of 3.0 and assuming that the water table may rise to foundation level.
(b) Would a foundation of that width satisfy the bearing resistance limit state?
The unit weight of the sand above the water table is 17 kN/m3 and below the water table the saturated unit weight is 20 kN/m3.
Repeat Problem 11.1 based on LRFD using the following factors:
load factor for dead load = 1.25
load factor for live load = 1.75
strength reduction factor on the ultimate bearing capacity = 0.50
11.1 A continuous foundation is required in a soil where
d = 10 kN/m², = 26°, and y = 19.0 kN/m³. The depth of the
footing will be 1.0 m. The dead load and the live load are 600 kN/m
and 400 kN/m, respectively. Determine the required width for the
foundation based on allowable stress design with FS = 3, using Eq.
(6.10) and Table 6.1.
The square footing shown below must be designed to carry a 2400 KN load.
Use Terzaghi's bearing capacity formula and factor of safety = 3.
Determine the foundation dimension B in the following two cases:
1. The water table is at Im below the foundation (as shown).
2. The water table rises to the ground surface.
2400 kN
O = 32°
C = 50 kN/m?
Yd = 17.25 kN/m³
2 m
3m
B
Ys = 19.5 kN/m³
Chapter 11 Solutions
Principles of Foundation Engineering (MindTap Course List)
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CE 414 Lecture 02: LRFD Load Combinations (2021.01.22); Author: Gregory Michaelson;https://www.youtube.com/watch?v=6npEyQ-2T5w;License: Standard Youtube License