2. The column load of a square foundation (Figure 1) is given. If the depth of foundation D= 4 ft, 0=30°, and c = 0. UsingTerzaghi's bearing capacity equation and FS = 2.5, determine the proper size of the footing.D.L. = 80 kipL.L. = 60 kipqult = 1.3 c N. + qN, + 0.4 y B N,Figure 1TABLE 2.1 Terzaghi's Bearing Capacity Factors-Eqs. (2.32), (2.33), and (2.34)N. N,N.N.N,N.N,N,Ysoil = 118 pcf2 ftW.T1.00 0.00 17 14.600.01 18 15.121.22 0.04 19 | 16.576.62 1.35 0.06 20 | 17.691.49 0.10 21 | 18.92|1.64 0.14 22 20.271.81 0.20 23 21.752.00 0.27 24 23.362.21 0.35 25 25.132.44 0.44 26 27.099.61 2.69 0.56 27 29.245.705.452.18342.59 353652.6457.7536.5038.04D; = 4m6.001.16.0441.4445.416.306.703.0763.5347.1654.363.644.31385.093970.0177.5085.9795.66106.8165.2778.6195.0337.443753.808.269.1961.5570.6146.9757.343m x2m6.7.7310.236.004081.27115.3111.4012.72| 8.348.157.084193.85140.51171.99211.5688.6042119.67108.759.0914.219.8443134.58126.5015.90 11.604417.81 13.7o4510151.95147.74261.6011 10.16 2.98 0.69 28 31.6110.76 3.29 |0.85 29 34.24 | 19.98 |16.18 46 196.22172.28173.28325.341213 11.4114 12.1115 12.86204.193.63 1.04 30 37.164.02 1.26 31 | 40.414.45 1.52 32 44.04 | 28,52 26.874.92 |1.82 33 | 48.0922.46 19.13 47 | 224.5525.28 22.65407.11512.84650.87241.8048 | 258.28 287.85344.63415.14 | 1072.8049298.71831.991613.6832.23 31.9450347.50

Given data: DL= 80 kip LL = 60 kip Total load = 1.4(80)+1.7(60) = 214 kip Cohesion of soil, c = 0…

2. The column load of a square foundation (Figure 1) is given. If the depth of foundation D= 4 ft, 0=30°, and c = 0. Using Terzaghi's bearing capacity equation and FS = 2.5, determine the proper size of the footing. D.L. = 80 kip L.L. = 60 kip qult = 1.3 c N. + qN, + 0.4 y B N, Figure 1 TABLE 2.1 Terzaghi's Bearing Capacity Factors-Eqs. (2.32), (2.33), and (2.34) N. N. N, N. N. N, N. N. N, Ysoil = 118 pcf 2 ft ф W.T 5.70 1.00 0.00 17 14.60 2.18 34 2.59 35 3.07 36 3.64 37 5.45 52.64 36,50 38.04 D, = 4m 6.00 1.1 0.01 18 15.12 19 | 16.57 6.04 57.75 63.53 1 41.44 45.41 6.30 |1.22 |0.04 6.62 1.35 0.06 20 | 17.69 2 6.70 47.16 54.36 3 7.44 70.01 53.80 65.27 1.49 0.10 |21 |18.92 38 77.50 61.55 4 6.97 7.34 1.64 0.14 22 20.27 8.26 9.19 4.31 78.61 3m x2m 5.09 39 40 7.08 41 8.34 42 5 85.97 70.61 95.03 7.73 1.81 0.20 23 21.75 10.23 95.66 115.31 140.51 171.99 6 6.00 81.27 8.15 2.00 0.27 24 23.36 11.40 106.81 119.67 93.85 8 8.60 2.21 0.35 25 25.13 | 12.72 108.75 9 9.09 244l044 26 27.09 14.21l 9.84 43 134. 58 126.50 211.56

2. The column load of a square foundation (Figure 1) is given. If the depth of foundation D= 4 ft, 0=30°, and c = 0. Using Terzaghi's bearing capacity equation and FS = 2.5, determine the proper size of the footing. D.L. = 80 kip L.L. = 60 kip qult = 1.3 c N. + qN, + 0.4 y B N, Figure 1 TABLE 2.1 Terzaghi's Bearing Capacity Factors-Eqs. (2.32), (2.33), and (2.34) N. N. N, N. N. N, N. N. N, Ysoil = 118 pcf 2 ft ф W.T 5.70 1.00 0.00 17 14.60 2.18 34 2.59 35 3.07 36 3.64 37 5.45 52.64 36,50 38.04 D, = 4m 6.00 1.1 0.01 18 15.12 19 | 16.57 6.04 57.75 63.53 1 41.44 45.41 6.30 |1.22 |0.04 6.62 1.35 0.06 20 | 17.69 2 6.70 47.16 54.36 3 7.44 70.01 53.80 65.27 1.49 0.10 |21 |18.92 38 77.50 61.55 4 6.97 7.34 1.64 0.14 22 20.27 8.26 9.19 4.31 78.61 3m x2m 5.09 39 40 7.08 41 8.34 42 5 85.97 70.61 95.03 7.73 1.81 0.20 23 21.75 10.23 95.66 115.31 140.51 171.99 6 6.00 81.27 8.15 2.00 0.27 24 23.36 11.40 106.81 119.67 93.85 8 8.60 2.21 0.35 25 25.13 | 12.72 108.75 9 9.09 244l044 26 27.09 14.21l 9.84 43 134. 58 126.50 211.56

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Concept explainers

Load and resistance factor design

Load and resistance factors design (LRFD), also known as Limit state design (LSD), refers to the design method used in building engineering. A boundary condition is a condition of a structure where it can no longer meet the relevant design requirements. The condition may refer to the load level or other actions on the structure, while the terms refer to the integrity of the structure, suitability for use, durability, or other design requirements. A structure designed for LRFD is limited to keeping track of all possible actions during its design time and is always ready for use, with the appropriate level of reliability in each boundary condition. LRFD-based construction codes clearly define the appropriate levels of reliability in their instructions.

Question

2. The column load of a square foundation (Figure 1) is given. If the depth of foundation D= 4 ft, 0=30°, and c = 0. Using
Terzaghi's bearing capacity equation and FS = 2.5, determine the proper size of the footing.
D.L. = 80 kip
L.L. = 60 kip
qult = 1.3 c N. + qN, + 0.4 y B N,
Figure 1
TABLE 2.1 Terzaghi's Bearing Capacity Factors-Eqs. (2.32), (2.33), and (2.34)
N. N,
N.
N.
N,
N.
N,
N,
Ysoil = 118 pcf
2 ft
W.T
1.00 0.00 17 14.60
0.01 18 15.12
1.22 0.04 19 | 16.57
6.62 1.35 0.06 20 | 17.69
1.49 0.10 21 | 18.92
|1.64 0.14 22 20.27
1.81 0.20 23 21.75
2.00 0.27 24 23.36
2.21 0.35 25 25.13
2.44 0.44 26 27.09
9.61 2.69 0.56 27 29.24
5.70
5.45
2.18
34
2.59 35
36
52.64
57.75
36.50
38.04
D; = 4m
6.00
1.1
6.04
41.44
45.41
6.30
6.70
3.07
63.53
47.16
54.36
3.64
4.31
38
5.09
39
70.01
77.50
85.97
95.66
106.81
65.27
78.61
95.03
3
7.44
37
53.80
8.26
9.19
61.55
70.61
4
6.97
5
7.34
3m x2m
6.
7.73
10.23
6.00
40
81.27
115.31
11.40
12.72| 8.34
8.15
7.08
41
93.85
140.51
171.99
211.56
8
8.60
42
119.67
108.75
9.09
14.21
9.84
43
134.58
126.50
15.90 11.60
44
17.81 13.7o
45
10
151.95
147.74
261.60
11 10.16 2.98 0.69 28 31.61
10.76 3.29 |0.85 29 34.24 | 19.98 |16.18 46 196.22
172.28
173.28
325.34
12
13 11.41
14 12.11
15 12.86
204.19
3.63 1.04 30 37.16
4.02 1.26 31 | 40.41
4.45 1.52 32 44.04 | 28,52 26.87
4.92 |1.82 33 | 48.09
22.46 19.13 47 | 224.55
25.28 22.65
407.11
512.84
650.87
241.80
48 | 258.28 287.85
344.63
415.14 | 1072.80
49
298.71
831.99
16
13.68
32.23 31.94
50
347.50

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