Answered: Determine the qult and Qult for the 8ft…

Engineering

Civil Engineering

Determine the qult and Qult for the 8ft x 8ft spread footing in the soil profile below

Principles of Geotechnical Engineering (MindTap Course List)

9th Edition

ISBN:9781305970939

Author:Braja M. Das, Khaled Sobhan

Publisher:Braja M. Das, Khaled Sobhan

Chapter16: Soil Bearing Capacity For Shallow Foundations

Section: Chapter Questions

Problem 16.5P: Redo Problem 16.1 using the modified general ultimate bearing capacity Eq. (16.31). 16.1 A...

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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.
Refer to Problem 16.13. Design the size of the footing using the modified general ultimate bearing capacity Eq. (16.31). 16.13 A square footing (B B) must carry a gross allowable load of 1160 kN. The base of the footing is to be located at a depth of 2 m below the ground surface. If the required factor of safety is 4.5, determine the size of the footing. Use Terzaghis bearing capacity factors and assume general shear failure of soil. Given: = 17 kN/m3, c = 48 kN/m2, = 31.
Redo Problem 16.2 using the modified general ultimate bearing capacity Eq. (16.31). 16.1 A continuous footing is shown in Figure 16.17. Using Terzaghis bearing capacity factors, determine the gross allowable load per unit area (qall) that the footing can carry. Assume general shear failure. Given: = 19 kN/m3, c = 31kN/m2, =28, Df = 1.5 m, B = 2 m, and factor of safety = 3.5. Figure 16.17 6.2 Refer to Problem 16.1. If a square footing with dimension 2 m 2 m is used instead of the wall footing, what would be the allowable bearing capacity?
7. A continuous strip footing bears on sand with groundwater one-half the footing width below the base of the footing. Which of the following changes will Increase the allowable bearing pressure? D B/2 PFT B SAND A) Embedment depth remains D, but the footing width is decreased. B) Embedment depth remains D, but the groundwater is raised to B/4 below the base of the footing. C) Embedment depth and groundwater remain D and B/2, but the unit weight of the sand is increased. D) Groundwater remains at B/2 below the base of the footing, but the embedment depth is decreased.
A rectangular combined footing 8 ft * 20 ft is founded at a depth of 6 ft on a normally con-solidated sand deposit. The sand deposit is approximately 28 ft thick and overlies sandstone. CPT tests indicate the sand is relatively uniform below the proposed footing depth and theaverage tip resistance is 50 tsf. The total service load carried by the combined footing is480 k. Estimate the settlement of this footing.
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
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---Continuation of my recently posted question---A rectangular footing has dimensions shown and is acted upon by a dead load of 1200 kN and a live load of 1600 kN. The column dimension is 300x600 where the shorter dimension is parallel to B. The thickness of the footing is 500mm. F'c = 28 MPa and fy = 420 MPa for diameter 20mm bars. A = 2.4m and B = 4.2m Calculate the following:1.)The Punching shear force, kN2.)The Ultimate Punching Shear stress, MPa3.)The Critical Moment, kN-m4.)Is the given footing adequate for the given loads? Yes or No? Explain
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.
(a) Design (determine only B and L) a rectangular footing for the conditions in the figure below and using the assigned data given in the table Section B- quatali/unit length Property line B Plan Figure 1. Concept of a rectangular combined footing Load Load Spacing Location of the Allowable soil fe fy (Q.) (Q2) (L,) Property Line (L2) pressure (qau) 480 kN 570 kN 4.5 m 1.5 m 21 MPa 400 MPa 175 kPa (b) Estimate the total consolidation settlement after the 5 years after the completion of the primary consolidation settlement of the foundation (from (a), q = 175 kPa) considering the three-dimensional effect provided that A = 0.6. (Note: Time for completion of primary consolidation settlement is 1.5 years. You do not need to 3D effect for the secondary compression, Ca = 0.01)
SHOW ME A DETAIL SOLUTIONS FOR THIS PROBLEM. A 2.90 meter square isolated footing with thickness of 650 mm is to carry a concentric load of 1200 kN service dead load and 1120 kN service live load. The bottom of the footing is rested at a depth of 1.50 m from the ground surface. The ultimate bearing capacity of the soil is 775 kPa, with recommended factor of safety of 2.50 for design. The footing has a bottom reinforcement of 17 pieces of 16mm diameter bars on both directions. Use f'c = 29.25 MPa and fy = 275 MPa. Use clear concrete cover of 75 mm. Assess the adequacy of the design of the said footing to carry the given loads. Neglect the effect of soil at top of footing and weight of footing on net bearing capacity of soil.
Q, + Q; Given: A rectangular combined footing. • Column Loads: • Q, = 120 kip • Q, = 200 kip • Column Spacing L3 = 10 ft The property line that L,= 4 ft. Property line Find: The size of B x L of the combined footing