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A bearing wall carries a total unfactored load 220 kN/m. It is to be supported on a 400 mm deep continuous footing. The underlying soils are medium sands with
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- A 2.0 m 2.0 m square pad footing will be placed in a normally consolidated clay soil to carry a column load Q. The depth of the footing is 1.0 m. The soil parameters are: c = 0, = 26, = 19 kN/m3, and cu = 60 kN/m2. Determine the maximum possible value for Q, considering short-term and long-term stability of the footing.arrow_forwardRefer to the rectangular combined footing in Figure 10.1, with Q1 = 100 kip and Q2 = 150 kip. The distance between the two column loads L3 = 13.5 ft. The proximity of the property line at the left edge requires that L2 = 3.0 ft. The net allowable soil pressure is 2500 lb/ft2. Determine the breadth and length of a rectangular combined footing.arrow_forward(5) There is a strip footing with a width of 2 m and a buried depth of 1.5 m. The foundation soil is silt with a unit weight of 19 kN/m', a saturated unit weight of 20 kN/m², cohesion of 10 kPa, and an internal friction angle of 20°. The groundwater level is I m below the ground surface. Please determine the ultimate bearing capacity of the foundation. (arrow_forward
- 1. A 4ft by 4ft spread footing is proposed where the bottom of footing is set 2ft below grade. The column bearing on this footing will impose a load of 180kips. Assuming the subsurface conditions shown below with groundwater 5ft below grade, Use Schmertman's method to calculate the elastic settlement of the system 6 years after construction is completed, provide a clear sketch and show units and state assumptions. Oft Sand Ymoist = 120 pcf Phi = 30deg Es = 52 ksf 4ft Loose Sand 5ft Ymoist = 125 pcf Yat = 145 pcf Phi = 22deg Es (above GW) = 30 ksf Es (below GW) = 20 ksf 8ft Dense Sand Ysat = 155 pcf Phi = 35deg Es = 60 ksf 20ft 2. The foundation above is limited to a 1.5" settlement after 10 years, speak to whether the design is adequate and if not how can you adjust the project to meet this criteria.arrow_forwarda square footing with a size of 10 ft by 10 ft is located 8ft below the ground surface. the subsoil consists of a thick deposit of stiff cohesive soil with an unconfined compressive strength equal to 3600lb/ft2. The soils units weight is 128lb/ft3. calculate the ultimate bearing capacity.arrow_forwardA column load of 72 kips is applied to the 6 ft by 8 ft rectangular concrete footing shown below. The groundwater table is 2 ft deep. The soil profile and properties are shown below. The required minimum factor of safety against bearing capacity failure is 2.5. Is the current foundation design acceptable? Use Vesic’s bearing capacity formula 1a. Intermediate calculation: compute the ultimate bearing capacity, qult, in units of psf. 1b. Intermediate calculation: compute the applied bearing pressure, q, in units of psf. 1c. Final calculation: compute the factor of safety (FS) against bearing capacity failure.arrow_forward
- A square footing is to be constructed on a sitly sand soil, as shown in the figure below. The groundwater table is at depth 15 m below the ground surface. Compute the ultimate bearing capacity and the column load required to produce a bearing capacity failure. ć= 8 kPa Solution: $ = 30 ý = 19 1 m. kN m³ 0.6 m-arrow_forwardA proposed office building will include a 10 ft x10 ft square, 3 ft deep (the footing height is also 3 feet) spread footing. The normally consolidated clay has the following engineering properties: Ydry = 115.0 pcf $'=24° c'=90.0 psf Cc/(1+eo) = 0.15 The soil stratum extends to a great depth, and the ground water table is 50 ft below the ground surface. Using the classical piece-wise log-linear method, estimate the total settlement of this footing considering only the allowable bearing pressures using ASD approach. The unit weight of concrete is 150 pcf. State any assumptions made.arrow_forward4. A subsurface exploration is conducted and it is discovered that the subsurface soils are primarily stiff sandy clays. Given the spacing of some of the columns it is decided that strip footings would best support them. The proposed footing configuration is shown below. Detemine the ultimate loads that can be supported by the footing shown if it is founded at a depth of 3.5 feet below the ground surface. The groundwater was found to be at a depth of 10 ft below the ground surface. Assume the rectangular foundation is rigid and that the loads from both columns are uniformly supported by the footing. Use a factor of safety of 4. 15 ft 2.5 ft 2.5 ft 5 ft 10 ft PLAN Qult Qult ELEVATION 3.5 ft 14 in C = 300 lb/ft? 10 ft y = 118.6 lb/ft³ Ø = 15° c = 300 lb/ft² Ysat = 126.6 lb/ft³ Ø = 15°arrow_forward
- A 10 foot diameter circular footing is to be constructed and will have a net bearing pressure of 2,000 psf. Determine the increase in vertical stress at a depth of 20 feet below the center of the footing the edge of the footingarrow_forwardAn 18 in square concrete column carries a factored ultimate compressive load of 640 k. It isto be supported on a 8 ft wide 12 ft long rectangular spread footing. Select appropriate valuesfor f′c and fy, then determine the required footing thickness and design the flexural reinforcingsteel. Show the results of your design in a sketch.arrow_forward1) A footing whose one side spans 4.2m carries a 520 kN dead load and 640kN live load from a reinforced concrete column. The column measures 500mm parallel to the long side of the foundation, and 800mm on the other side. Assume effective soil bearing capacity of 80kPa, concrete compressive strength of 21 MPa, and steel yield strength of 280 MPa. Determine the following: • Dimensions of the footing (use 100mm increments) • The thickness of the footing (use 10mm increments) • Number of 20mm reinforcements along each dimensionarrow_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