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 10, Problem 10.11P
To determine
Find the coefficient of subgrade reaction for a 2 m wide and 0.4 m thick beam using Equations (10.45) and (10.46)
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Problem 266
At 20°C, a rigid slab having a mass of 55MG is placed upon
two bronze rods and one steel rod as shown. At what
temperature will the stress in the steel rod be zero? For the
steel rod, A=6,000 mm2, E=200 x 10' N/m2 and a=11.7
um/(m C). For each bronze rod, A=6,000 mm?. E=83 x 10
N/m2, and a=19.0 um/(m°C).
M
23Dmm
Bronze
Steel
Bronze
(b) Figure Q2 (b) shows the ring foundation to support a silo. Given R1 = 3 m while R2 =6 m. The total vertical load is 7500 kN.
(i) Calculate and plot the vertical stress increase with depth up to 7 m (use 1 minterval) under the centre of the ring (point O).(ii) Determine the maximum vertical stress increase and its location.
Chapter 10 Solutions
Principles of Foundation Engineering (MindTap Course List)
Ch. 10 - Refer to the rectangular combined footing in...Ch. 10 - Prob. 10.2PCh. 10 - Prob. 10.3PCh. 10 - Prob. 10.4PCh. 10 - Prob. 10.5PCh. 10 - Prob. 10.6PCh. 10 - Prob. 10.7PCh. 10 - Prob. 10.8PCh. 10 - A plate loading test was carried out on a medium...Ch. 10 - A 300 mm 450 mm plate was used in carrying out a...
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- A rectangular reinforced concrete beam has a width of 350 mm and an effective depth of 600 mm. The beam is reinforced with four 36 mm diameter tension bars and two 28 mm diameter compression bars with centroid of 60 mm from the extreme compression fiber, The compression strength of concrete is fc = 20.70 MPa and the steel yield strength is fy = 345 MPa. 4. Which of the following most nearly gives the depth of the rectangular compression stress block? a. 126.82 mm b. 138.91 mm c. 142.75 mm d. 159.10 mm 5. Which of the following most nearly gives the distance of the neutral axis form the extreme compression of the beam? a. 126.82 mm b. 138.91 mm c. 142.75 mm d. 159.10 mm 6. Which of the following most nearly gives the ultimate moment capacity of the beam? a. 624.72 KN-m b. 614.95 KN-m c. 665.43 KN-m d. 583.65 KN-marrow_forwardGiven the figure is the soil layer of a project site. The proposed building will exert a net stress of 12 Newtons per square cm. 4 m y=17.6 kN/m³ 11.2 m L'=10.4 kN/m³ w=40% LL=40% 8.2 m Xa=27.3 kN/m³ a) Determine the buoyant unit weight of the clay. [ Select ] b) Determine the vertical effective stress at the midheight of the clay layer. [ Select ] c) Determine the average settlement of the normally consolidated clay layer. [ Select ] Soft Clay Fine Sandarrow_forwardA vertical column load, P = 600 kN, is applied to a rigid square concrete foundation. The foundation rests at a depth Df= 0.75 m on a uniform dense sand with the following properties: average modulus of elasticity, Es = 20,600 kN/m², and Poisson's ratio, µs = 0.3. Calculate the required foundation dimensions if the allowable settlement under the center of the foundation is 25mm. 600 kN Foundation 0.75 m Вхв Soil Hs = 0.3 E, = 20, 600 kN/m² 5.0 m Rockarrow_forward
- The correct answer is already selected. Just provide the solutionarrow_forwardA rectangular concrete slab, 3mx4m, rests on the surface of a soil layer as shown in the figure. The saturated clay has over consolidation ratio of 2, w=38%, and Cr=0.05. Determine the primary consolidation settlement of the clay. The load on the foundation is 2000OKN. Assume that 20% of voids in sand is air and porosity of sand is 0.43. Cc=0.28 Gs=2.65 4 m Fine sand 5 m Clay 2 marrow_forward6 decimal places for the solutionarrow_forward
- 11.1 A vertical column load, P = 600 kN, is applied to a rigid concrete foundation with dimensions B = 1 m and L = 2 m, as shown in Figure 11.45. The founda- tion rests at a depth D₁ = 0.75 m on a uniform dense sand with the following properties: average modulus of elasticity, E¸ 20,600 kN/m², and Poisson's ratio, μ = 0.3. Estimate the elastic settlement due to the net applied pressure, Ao, on the foundation. Given: H = 5 m. Foundation BXL Figure 11.45 600 KN V 74 Ao Soil Ms = 0.3 Es = 20, 600 kN/m² Rock = 0.75 m 5.0 marrow_forwardSoil mechanicsarrow_forwardA rectangular concrete slab, 3 m X 4.5 m, rests on the surface of a soil mass. The load on the slab is 2025 kN. Determine the vertical stress increase at a depth of 3 m (a) under the center of the slab, point A (see Figure); (b) under point B (see Figure); and (c) at a distance of 1.5 m from a corner, point C (see Figure ). Compare your results with the Approximate Method and comment on the results.arrow_forward
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