Working example 10.2: Design a strip footing A 300 mm thick concrete wall carries a service dead load of 140 kN/m and a service live load of 225 kN/m. The allowable soil pressure is 240 kPa at the level of the bottom of the footing which is 1500 mm below the ground surface. Design a strip footing using f.' = 20 MPa and fy = 400 MPa. The density of the soil is 2040 kg/m³. %3D

Working example 10.2: Design a strip footing A 300 mm thick concrete wall carries a service dead load of 140 kN/m and a service live load of 225 kN/m. The allowable soil pressure is 240 kPa at the level of the bottom of the footing which is 1500 mm below the ground surface. Design a strip footing using f.' = 20 MPa and fy = 400 MPa. The density of the soil is 2040 kg/m³. %3D

Principles of Foundation Engineering (MindTap Course List)

9th Edition

ISBN:9781337705028

Author:Braja M. Das, Nagaratnam Sivakugan

Publisher:Braja M. Das, Nagaratnam Sivakugan

Chapter10: Mat Foundations

Section: Chapter Questions

Problem 10.1P: Refer to the rectangular combined footing in Figure 10.1, with Q1 = 100 kip and Q2 = 150 kip. The...

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A 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.
(c) Serviceability limit state is the critical criterion for the design of a square footing on the soil profile shown in Figure Q-c. The groundwater level is 3 m below the ground surface, but is expected to seasonally rise to the surface. The applied loading will cause a vertical stress increase at the center of the clay layer of 15 kPa. Calculate the consolidation settlement of theclay.
Refer 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.
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, cu = 60 kN/m2 (=0 condition). Determine the maximum possible value for Q, considering short-term and long-term stability of the footing.
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.
Rectangular footing (4m x 5m) was supported by a saturated clay layer with a thickness of 5m. If the second layer (below the clay) was a saturated sand. The settlement that could be occurred in this site: a. Is only consolidation settlement b. None of the given answers are correct c. Is a short term settlement d. Is only long term settlement
12- Calculate the net allowable soil stress of a soll with allowable stress 300 kN/m2 in the depth of 2.50 m from the soil surface under the footing of which height is 0.50 m. Unit weight of concrete is 25 kN/m3 and unit weight of the soil is 18 kN/m3. a) b) 3 d) e) 251.5 kN/m 351.5 kN/m2 251.5 kN/m3 None. 251.5 kN/m2 Boş birak
Q2/ Design the footing shown the figure below, using fc = 24 Mpa and fy = 415 Mpa N M M=800 KN-m DL= 800 KN LL=800 KN w=0.5 m 2.25 m 60 kPa Love (L-w) 2 2.25 m 3 m 239 kPa
Based on the figure shown below determine the width of the ?footing (B) in (meter) F2 F1 3.5 m 0.8 m Use: F1= 1,725 N; F2= 1,028 N; and allawable stress for soil = 173 N/m2
2 m 3m 75 EV 1 m A The footing plan is shown loaded uniformly in a rectangular area. What is the value of the increase of stress of the second or loaded area (Aσ₂) to be subtracted?
Show your solution and diagram. Design a square spread footing to support an edge column 460mm x 460mm in dimension. The allowable soil pressure is 478.5 KPa, unit weight of soil is 20.4 KN/m³, unit weight of concrete is 23.5 KN/m³, fć = 21 MPa, fy = 414 MPa, 75mm clear cover and 25mm diameter rebars both ways.
Problem 2. A rectangular footing supports a square column concentrically. Given: Footing Dimensions: 3.0m wide x 4.5m long and 0.75m depth Column Dimensions: 0.40m x 0.40m Concrete, fc’ = 21MPa Steel, fy = 275MPa Concrete cover to the centroid of steel reinforcements = 110mm Unit weight of concrete = 23.5kN/m3 Unit weight of soil = 16kN/m3 Determine the concentrated load that the footing can carry based on beam action. Calculate the concentrated load that the footing can carry based on two-way action. If the allowable soil pressure at service loads is 200kPa, what column axial load (unfactored) in kN can the footing carry if depth of earth fill is 2.0m above the footing?