A square footing with a width of 4 ft is subjected to a concentric load of 200 kips. The bottom of the footing is located 6 ft below the ground surface. The ground water table is located at a depth of 8 ft below the ground surface. The given soil properties are γt of 115 pcf, γsat of 122 pcf, ϕ' of 25°, c' of 800 psf, Gs of 2.68 and wn of 15%. Determine the allowable bearing capacity using Terzaghi’s equations for a FS of 4.5.
Nc = 25.13, Nq = 12.72, NY =8.34
A square footing with a width of 4 ft is subjected to a concentric load of...
2. A 5-ft square, 2-ft deep spread footing is subjected to a concentric vertical load of 60 k and an overturning moment of 30 ft-k. The overturning moment acts parallel to one of the sides of the footing, the top of the footing is flush with the ground surface, and the ground water table is at a depth of 20 ft below the ground surface. Compute the minimum and maximum bearing pressures, d show the distribution of bearing pressure in...
Geotechnical square foundation design
1. A square footing is subjected to a vertical load of 50,000 lbs and a moment of 25,000 lb-ft. The depth of the foundation is 4 ft. The water table is at the base of the footing. The soil above the base of the footing has y-100 pcf and a friction angle of 30°. The soil below the base of the footing has a Ysat 120 pcf, a friction angle of 20° and c-100 psf. Find...
A 100,000 lb load has to be carried by a concrete square foundation placed 3 ft below the surface of a saturated sandy soil having the following properties: γt = 120 pcf E = 2x105 psf φ' = 30deg ν = 0.25 c' = 0 What footing width will be required for a factor of safety with respect to the ultimate bearing capacity of 3.0, and for a maximum settlement of 1". The water table is at the ground surface.
An eccentrically loaded (one-way eccentricity) square foundation, given: B = 5 ft, L = 5 ft, Df = 4 ft, e = 0.5 ft, γt = 110 pcf, c’=0 and ϕ’ = 30°. Note the ground water table is at great depth below the footing. Calculate the general bearing capacity to determine the maximum allowable load that the foundation can carry using Meyerhof’s effective area method for a FS of 3.
1. Design a wall footing for the following conditions. Service dead load is 6 kips/ft, service live load is 8 kips/ft. Soil unit weight is 120 lb/ft?. Allowable soil pressure, qa is 4000 psf. The base of the footing is placed 3 ft below the ground surface. Wall is 12 in, thick. Geotechnical analyses have determined the width to be 4 ft. fe' = 3500 psi normal weight concrete, and fy = 60 ksi. Note: you don't need to design...
2. Design a square spread footing for the following conditions. Service dead load is 350 kips, service live load is 275 kips. Soil density is 130 lb/ftº. Allowable soil pressure is 4500 psf. Column is 18 in. square. Geotechnical analyses have determined the width to be 13 ft. fe' = 3500 psi normal weight concrete, and fy= 60 ksi. The base of the footing is placed 5 ft below the ground surface. Note: you don't need to design the bar...
a 39 in wide ,24 inch deep continuous footing supports a wall load of 12 kips/ft. this footing underlain by pure medium dense sand with D' = 31° and γ = 122 Lb/ft3. The ground water table is at a depth of 4 ft below the ground surface. Determine the allowable bearing capacity of this foundation using a factor of safety FS=2.5
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A square footing is founded at 3-ft depth below ground surface as shown in Fig1, The factored axial load acting on the square footing is 140 kips, Determine the size of the footing (B x B) if the Factor of Safety (F.S.) is 3.0. Ground surface ЗА B-? Silty Sand Fig.1 A 68-ft long pre-stressed concrete pile with square cross section (14 inch) is driven into the soil profile shown in Fig. 2. Compute the ultimate compressive load...
3. The bearing capacity of shallow foundations (i.e. footings) depends on the soil shear strength (ie. ф and c). The ultimate bearing capacity (qultnei) of the soil is calculated using the following equation: Dr qult.net bearing capacity failure surface i. Frictional resistance along failure surface due to self-weight of soil below footing level footing level. Ny. No, and Ng are dimensionless bearing capacity factors that depend on the ii. Cohesive resistance along failure surface below footing level. iii. Frictional resistance...
S. Al-Martini, PhD, P. Eng. Question No. 5 (35minutes) 19 marks) As shown in the figure, a 9-ft 6-in square footing supporting an 18-in. -square tied concrete column and it is subjected to service dead load 225 kips, and service live load 175 kips. column is a typical interior column in a building. Assume normal-weight concrete.. soil pressure (ga) 5000 psf (5 ksf), f'e for column 4000 psi, f's for the footing lsteel 60, 000 psi. The density of the...