Figure 5.16 shows a foundation of 6.25 ft x 10ft resting on a sand deposit. The net load per unit area at the level of the foundation, qo, is 3000 lb/ft. For the sand, u, 0.3, E, = 3200 lb/in', Dr= 2.5 ft and H 32 ft. Assume that the foundation is rigid, and determine the elastic settlement the foundation would undergo. Use Eqs. (5.33) and (5.41); note that these equations are in the class note posted on the Blackboard. Eq (5.33) = Se =2, Ca B').- Es Is If Foundation B XL Lo= net applied pressure on fandadien Ms = Poisson's ratio of soil Es = averaye modulus of elastisity. B= B½ fer centr of feundatien Rigid foundation settlement Flexible foundation settlement H Poisson's ratio E, - Modulus of elasticity Is = shape facter %3D Eq (5.41) = Secrigid)0.93 Secflek: ble, center) Soil Rock Figure 5.16

Figure 5.16 shows a foundation of 6.25 ft x 10ft resting on a sand deposit. The net load per unit area at the level of the foundation, qo, is 3000 lb/ft. For the sand, u, 0.3, E, = 3200 lb/in', Dr= 2.5 ft and H 32 ft. Assume that the foundation is rigid, and determine the elastic settlement the foundation would undergo. Use Eqs. (5.33) and (5.41); note that these equations are in the class note posted on the Blackboard. Eq (5.33) = Se =2, Ca B').- Es Is If Foundation B XL Lo= net applied pressure on fandadien Ms = Poisson's ratio of soil Es = averaye modulus of elastisity. B= B½ fer centr of feundatien Rigid foundation settlement Flexible foundation settlement H Poisson's ratio E, - Modulus of elasticity Is = shape facter %3D Eq (5.41) = Secrigid)0.93 Secflek: ble, center) Soil Rock Figure 5.16

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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Q1:
It has been determined that the stress increase occurring at a depth of 6 m below the center of the foundation with a diameter of 6 m is equal to the increase in stress at 6 m depth under the center of the square foundation of 6 m X 6 m. Since the load carried by the circular foundation is 1000kN, how much load does the square foundation carry?
Please solve part 2 and Part 3 only
2. Please find the possible solutions for this question! A foundation 4 m x 5 m transfers a total load of 5 MN to stiff overconsolidated clay with an OCR=4 and ysar=19 kN/m (given figure below). Groundwater level is at 1 m below the ground surface. A CU test was conducted on a soil sample taken at a depth 5 m below the center of the foundation. The results obtained are (cu.)p = 40 kPa, o', = 28, and 'es= 24. Determine if the soil will reach the failure state for short- term and long-term loading conditions. If the soil does not reach the failure state, what are the factors of safety for short-term and long-term loading conditions? Assume the soil above the groundwater level is saturated. Please discuss the details of your findings! 5 MN Foundation: 4 m x 5 m 21 =1m Stiff clay 22 = 4 m Sample
Example 12.6 A square foundation is shown in Figure 12.9. Assume that the load eccentricity e 0.5 ft. Determine the ultimate load, Qut Sand y = 115 lb/ft d' = 30° 5ft X5ft c' 0 Figure 12.9
Question 1) For a shallow foundation measuring (1.7 m x 2.2 m) as shown below: , A. Estimate the elastic settlement proposed by Mayerhof. Then, B. Estimate the elastic settlement proposed by Bowles, if the water table rises 1.5 m. Then, Use yw=10 kN/m³ qnet= 1.2 MN/m2 G.S 1.5 m Sand Yd=16 kN/m³ Ysat= 17 kN/m3 %3D 2.5 m N60=52 V W.T. Silty Sand Ya=18 kN/m³ Ysat = 18.5 kN/m? N60=52 3.5 m Sand Ya=19 kN/m3 Ysat = 22 kN/m³ e, = 0.4, Ae=0.04 , o'= 194 kN/m2 5 m Cc= 0.3, Cs= 0.2 , Ca= 0.05 N60=60 CS Scanned with CamScanner
X=30
4. A flexible foundation is shown below, determine the immediate settlement below the center of the foundation. Assume the thickness of the soil below the foundation is 20 meters. Following is the variation of the modulus of the soil below the foundation. Es (kN/m²) Depth below the foundation(m) 0-4 4-8 8-20 >20 1.2m 10000 8000 12000 8 90 = 150kPa BXL = 2m x 2m Ug = 0.3
4. A flexible foundation is shown below, determine the immediate settlement below the center of the foundation. Assume the thickness of the soil below the foundation is 20 meters. Following is the variation of the modulus of the soil below the foundation. Es (kN/m²) Depth below the foundation(m) 0-4 4-8 8-20 >20 1.2m 10000 8000 12000 ∞ 90 = BXL = 2m x 2m Us = 0.3 150kPa
i5:) For the continuous foundation show below, determine the amount of ultimate load for each meter length of the foundation. Consider the one-dimension eccentricity. : -) = 105 Ib/ft: Groundwater table 2 ft 4 ft Ysat = I18 lb/ft c' = 400 lb/ft? +2 ft - 25° 5 ft