A strip footing (6 m wide) is designed for a total settlement of 40 mm. The safe bearingcapacity (shear) was 180 kN/m2 and safe allowable soil pressure was 150 kN/m2. Due tosome reason, now the footing is to be redesigned for total settlement of 25 mm. The newwidth of the footing will be

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A strip footing (6 m wide) is designed for a total settlement of 40 mm. The safe bearing capacity (shear) was 180 kN/m² and safe allowable soil pressure was 150 kN/m². Due to some reason, now the footing is to be redesigned for total settlement of 25 mm. The new width of the footing will be

A strip footing (6 m wide) is designed for a total settlement of 40 mm. The safe bearing capacity (shear) was 180 kN/m² and safe allowable soil pressure was 150 kN/m². Due to some reason, now the footing is to be redesigned for total settlement of 25 mm. The new width of the footing will be

Fundamentals of Geotechnical Engineering (MindTap Course List)

5th Edition

ISBN:9781305635180

Author:Braja M. Das, Nagaratnam Sivakugan

Publisher:Braja M. Das, Nagaratnam Sivakugan

Chapter16: Shallow Foundations-bearing Capacity

Section: Chapter Questions

Problem 16.19CTP: A 2.0 m 2.0 m square pad footing will be placed in a normally consolidated clay soil to carry a...

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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, cu = 60 kN/m2 (=0 condition). Determine the maximum possible value for Q, considering short-term and long-term stability of the footing.
(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. (
A 3.2 m square footing is proposed to be used to support a 373 mm x 605 mm RC column loaded with 637 kN dead load and 856 kN live load. The bottom of the footing is 1.7 m below the ground. Assume soil weighs 19 kN/m3 and the allowable soil bearing pressure is 343 kPa. The thickness of the footing is 464 mm. fc = 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. Note: For two-way shear, use an effective depth measured from the top of the footing until the top of the bottom-most bar (d3) What is the ratio of the Demand Shear Force and the Capacity in Two Way Shear? (Vu/phiVn) Answer in 4 decimal places (1.6125, 1.5140, 0.8461, etc.) You Answered Correct Answer 1.3809 margin of error +/- 1%
Question 3. A strip footing is to be used in a clay soil in which the imposed load is 1 MN/m length. The clay layer is 7.0 m thick and overlies a stiff, fractured siltstone. The water table lies at a depth of 2.0 m. a. Determine the footing width based on the long-term allowable bearing capacity (calculated according to the method in the Canadian Foundation Engineering Manual; neglect depth factors) using a factor of safety of 3.0 for a burial depth of 2.0 m. The material properties of the clay are: c' = 15 E = 42 MPa o' = 27° y= 18.5 kN/m³ Ce = 0.40 e, = 0.90 C, = 9.3 x 104m²/day Cu = 25 b. Why would bearing capacity failure likely not govern the design of this structure?
A 4.7 m square footing is proposed to be used to support a 635 mm x 635 mm RC column loaded with 665 kN dead load and 843 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 331 kPa. The thickness of the footing is 462 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 Calculate the number of bars required in one direction. Provisions are given below for the minimum area of main reinforcements Reinforcement Type fy. MPa As.min. mm² Deformed Bars 420 MPa Reinforcement Greater of: 0.0018×420 f₂ 0.0014A -A₂
Q- A strip footing (8m wide) is designed for a total settlement of 40mm in cohesive soil. The safe bearing capacity (shear) was 150kN/m² and safe allowable soil pressure was 100kN/m². Due to importance of the structure, now the footing is to be redesigned for total settlement of 25mm. Find the new width of the footing.
A 3.4 m square footing is proposed to be used to support a 353 mm x 630 mm RC column loaded with 634 kN dead load and 853 kN live load. The bottom of the footing is 2.3 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 431 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. Note: For two-way shear, use an effective depth measured from the top of the footing until the top of the bottom-most bar (d3) What is the ratio of the Demand Shear Force and the Capacity in Two Way Shear? (Vu/phiVn)
5-A 1.5x1.5 m square footing is constructed in a cohesive soil at depth 1.2 m the ultimate bearing capacity for this footing calculated using Terzaghi's equation was 728 kN/m2. If the load has an eccentricity of 0.18 m from the center line of footing what will be the value of ultimate bearing capacity using Meyerhof's reduction factor? a) 633 kN/m2 b) 673 kN/m2 c) 553 kN/m2 d) 728 kN/m2
A continuous strip footing is to be located concentrically under a 300 mm wall that delivers service loads D = 360 kN/m and L= 220 kN/m to the top of the footing. The bottom of the footing will be 1.2 m below the final ground surface. The soil has a density of 20Kn/m3 and allowable bearing capacity of 280 Kn/m2. Materials strengths are fc’ =21 MPa and fy = 276 MPa. *Give an on-scale schematic structural detail
A continuous strip footing is to be located concentrically under a 300 mm wall that delivers service loads D = 360 kN/m and L= 220 kN/m to the top of the footing. The bottom of the footing will be 1.2 m below the final ground surface. The soil has a density of 20Kn/m3 and allowable bearing capacity of 280 Kn/m2. Materials strengths are fc’ =21 MPa and fy = 276 MPa. Design the footing considering the moments induce by the following loads given below in addition to the service loads: MD = 50 Kn-m ML = 60 Kn-m ME = 36 Kn-M Use the following load combinations: U= 1.2D + 1.6 L U = 1.2DL + 1.0L + 1.0E a. The required width of footing, b. The required effective and total depths, based on shear, c. The required flexural steel area. d. Give an on-scale schematic structural detail. ***Use 20 mm Ø
Q2: For the following spread footing, calculated the width of the footing if the footing length is 3.0m and the allowable bearing capacity was 126 kPa. 2a kN 33 kN. m 6 30 kN 1.5 n
A 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.