Concept explainers
A proposed column has the following design loads:
Axial load:
Shear load:
Compute the design axial and shear loads for foundation design using ASD.
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- Repeat Problem 20.2 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 20.2 A continuous foundation is required in a soil where c = 10 kN/m2, =26 and = 19.0 kN/m3. The depth of the foundation 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. (16.3) and Table 16.1.arrow_forwardDetermine the maximum column load that can be applied on a 1.5 m × 1.5 m square foundation placed at a depth of 1.0 m within a soil, where γ = 19.0 kN/m3, c′ = 10 kN/m2, and ф′ = 24°. Allow a factor of safety of 3.0.arrow_forwardFor the mat in Problem 16.15, what will be the depth, Df, of the mat for FS = 3 against bearing capacity failure? 16.15 Consider a mat foundation with dimensions of 18 m 12 m. The combined dead and live load on the mat is 44.5 MN. The mat is to be placed on a clay with cu = 40.7 kN/m2 and = 17.6 kN/m3. Find the depth, Df, of the mat for a fully compensated foundation.arrow_forward
- 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 , , and . 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.arrow_forwardA square column footing is to support a 500 mm square tied column that carries a dead load 1000 KN and a live load of 810 KN, the column is reinforced with 8 – 25 mm bars. The base of the footing is 1.50 m below the natural grade where the allowable soil pressure is 235 Kpa. The soil above the footing has a weight of 15.6 kn / cu.m. Assume fy = 27.5 Mpa, fc = 27.5 Mpa, and unit weight of concrete as 23.50 kn/cu.m, design the footing. Use 25 mm main bars.arrow_forwardThe four columns shown below have the following loads and dimensions (in the directions shown): Columns 1 and 2: DL=150 kN; LL=150 kN; 40 cm x 30 cm Columns 3 and 4: DL=300 kN; LL=250 kN; 50 cm x 40 cm Estimate the design safety factor for bearing capacity failure if the footing is placed at a depth of 2 m below the surface of a sandly-silty soil with c = 25 kPa, φ = 15° and γ = 17 kN/m3. Given the allowable bearing capacity of the soil qa = 125 kPa. Calculate the minimum concrete thickness, d', of the footing based on punching shear under column 4 (only). Use fc’ = 24 MPa, fy = 345 MParrow_forward
- a 300 mm thick footing slab supports a 300 mm thick concrete wall carrying uniform service dead load of 214.31 kN/m and service live load of 145.94 kN/m. the base of the wall footing slab is 1.2 m from the ground surface. design parameters are as follows: ysoil = 16 kN/m^3, yconci = 24 kN/m^3. qa = 215.46 kPa. f'c = 27 MPa and fy = 420 MPa. 1. calculate the net allowble bearing capacity of soil in kPa. a. 192.17 b. 189.06 c. 117.32 d. 176.26 2. calculate the minimum required width of the wall footing slab. a. 1.9 m b. 2 m c. 1.8 m d. 1.7 m 3. calculate the maxium ultimate moment (kN.m) in the slab if the width of the footing slab is 2.1 m. a. 82.64 b. 94.63 c. 128.80 d. 111.32arrow_forward300 mm thick footing slab supports a 300 mm thick wall carrying uniform service dead load of 214.31 kN/m and service live load of 145.9 kN/m. The base of the wall footing slab is 1.2 m from the ground surface.Design parameters are as follows: γsoil = 16 kN/m3, γconc = 24 kN/m3, qa = 215.46 kPa, f’c = 27 MPa and fy = 420MPa. 1.Calculate the net allowable bearing capacity of soil in kPa. 2.Calculate the minimum required width of the wall footing slab. 3 Calculate the maximum ultimate moment (kNm) in the slab if the width of footing slab is 2.1 m 4 Calculate the required center to center spacing of 16 mm bars for flexure if the maximum factored moment in thr slab is 75 kN-m 5 Calculate the ultimate beam shear stress on the footing slab if the footing slab is 2.1 m wide.arrow_forwardAssume unit weight of concrete to be 23.5 kN/m°. Hydrostatic uplift varies from 10% of the hydrostatic pressure at the heel and zero at the toe. Calculate the vertical component of the soil reaction on the dam. What is the factor of safety against overturning? What is the factor of safety against sliding? What is the maximum foundation pressure?arrow_forward
- Determine the maximum column load that can be applied on a 1.5 m × 1.5 m square foundation placed at a depth of 1.0 m within a soil, where γ = 19.0 kN/m, c' = 10 kN/m2, and ' 24°. Allow a factor of safety of 3arrow_forwardA 3.5 m square footing is proposed to be used to support a 328 mm x 328 mm RC column loaded with 815 kN dead load and 770 kN live load. The bottom of the footing is 2 m below the ground. Assume soil weighs 19 kN/m3 and the allowable soil bearing pressure is 314 kPa. The thickness of the footing is 553 mm. f'c = 21 MPa and fy = 420 MPa. It is to be reinforced with 20 mm diameter. Use 24 kN/m3 as the unit weight of concrete. Use an effective depth measured from the top of the footing until the center of the bottom-most bar (d1) Calculate the number of bars required in one direction.arrow_forwardA 300 mm thick footing slab supports a 300 mm thick concrete wall carrying uniform service dead load of 215 kN/m and service live load of 145 kN/m. The base of the wall footing slab is 1.0 m from the ground surface. Design parameters are as follows: γsoil = 16 kN/m3, γconc = 24 kN/m3, qa = 200 kPa, f’c = 28 MPa and fy = 420 MPa. alculate the effective net soil bearing capacity of the soil. = kPa (one decimal place)arrow_forward
- Principles of Foundation Engineering (MindTap Cou...Civil EngineeringISBN:9781337705028Author:Braja M. Das, Nagaratnam SivakuganPublisher:Cengage LearningFundamentals of Geotechnical Engineering (MindTap...Civil EngineeringISBN:9781305635180Author:Braja M. Das, Nagaratnam SivakuganPublisher:Cengage Learning