1.2.(20 points) An MSE wall is to be designed to support a roadway. The MSE wall is to be 8 m tall with a surcharge of 15 kPa. The retained soilhas unit weight of 21 kN/m3 and effective friction angle of 400. The foundation soil has unit weight of 18 kN/m3, c'-10 kN/m2 and f'-300. Thedesign life of the wall is 30 years. Design this wall for external and internal stability. Use 65-grade galvanized steel strips (fy-448MPa) with width= 50mm and thickness = 4 mm. Assume that the galvanization corrodes fully in 16 years, and the corrosion rate of the steel strips is 0.012 mm peryear. Report all assumptions. You can assume that the friction angle between the tie-soil is 2/3 the friction angle of the soil.(20 points) Design a geotextile reinforced wall that is 12 m high (i.e. specify the geotextile, Sv, L, and II. The backfill has unit weight of 16kN/m3 and f-300. The available geotextiles are given below. Use factors of safety of 1.5 for breaking and 1.4 for pull out. Assume the friction

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Answered: 1. 2. (20 points) An MSE wall is to be…

Principles of Foundation Engineering (MindTap Course List)

9th Edition

ISBN:9781337705028

Author:Braja M. Das, Nagaratnam Sivakugan

Publisher:Braja M. Das, Nagaratnam Sivakugan

Chapter17: Retaining Walls

Section: Chapter Questions

Problem 17.2P

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A S00 mm thick tooting siab supports a sUU mm thick concrete wall carryıng unitorm 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: Viat = 16 kN/m', Vned = 24 kN/m', q. = 215.46 kPa, f= 27 MPa and f, = 420 MPa. 1. Calculate the net allowable bearing capacity of soil in kPa. A. 192.17 B. 189.06 с. 117.32 D. 176.26 2. Calculate the minimum required width of the wall footing slab. B. 2.0 m C. 1.8 m A. 1.9 m D. 1.7 m 3. Calculate the maximum 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. 111.32 4. Calculate the required center to center spacing of 16 mm bars for fiexure if the maximum factored moment in the slab is 75 kN-m. A. 150 mm B. 180 mm C. 210 mm D. NOTA 5. Calculate the ultimate beam shear stress on the footing slab if the footing slab is 2.1 m wide. A 1.25 MPa B. 0.74 MPa C. 0.87 MPa D. 0.96 MPa
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Hi guys please help me answer this question with detailed solution. Thank you A small unyielding wall retains a dense cohesionless soil with no lateral movements of soil (at rest conditioned is assumed). the wall has a height of 2.5 m. the cohesionless soil has a unit weight of 16 kN/m3 and a saturated unit weight of 18.39 kn/m3. Angle of internal friction is 37 degrees. The ground water table is located 1.0 m below the ground level. A. Compute the lateral force acting on the wall B. Compute the location of the total lateral force above the bottom of the wall C. Compute the moment acting on the wall due to this lateral load
A 300 mm thick footing slab supports a 300 mm thick concrete wall carrying uniform service dead load of 145 kN/m and service live load of 215 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. calculate the maximum ultimate bending moment on 1-m-strip of footing slab if the footing is 1.9m wide.
A 300 mm thick footing slab supports a 300 mm thick concrete wall carrying uniform service dead load of 145 kN/m and service live load of 215 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. calculate the spacing of 12-mm-diameter rebars for flexure.
R2
A 360 mm thick footing slab supports a 300 mm thick wall carrying uniform service dead load of 283.7 kN/m and service live load of 145.6 kN/m. The base of the wall footing slab is 1.1 m from the ground surface. Use 16 mm diameter for main bars. Design parameters are as follows: ysoil = 18 kN/m3, yconc = 24 kN/m3, qa = 215.8 kPa, fc = 27 MPa and fy = 414 MPa. Calculate the allowable nominal beam shear stress in MPa. Express your answer in 3 decimal places.
A 1.4 m wide x 0.33 m thick RC footing is to be provided for a 250mm thick RC wall. The wall carries a dead load of 170 kN/m and a live load of 338 kN/m of the wall. The gross allowable soil pressure is 330 kPa. The bottom of the footing is 625 mm below the ground. Use fe = 21 MPa and fy = 420 MPa. Unit weight is 23.6 kN/m3 for concrete and 18.4 kN/m3 for the soil backfill. The diameter of main bars is 16mm and that of the shrinkage and temperature bars 10mm Calculate the required spacing of the main bars in mm Answer in four decimal places. (i.e. 230.2112, 102.3292) DO NOT ROUND OFF FINAL ANSWER IN MULTIPLES OF 10mm You Answered 237.6619 Correct Answer 203.4027 margin of error +/-0.5
pls answer 4 to 5
A 2.8 m wide x 0.42 m thick RC footing is to be provided for a 250mm thick RC wall. The wall carries a dead load of 161 kN/m and a live load of 224 kN/m of the wall. The gross allowable soil pressure is 260 kPa. The bottom of the footing is 1,031 mm below the ground. Use f'. = 21 MPa and fy = 420 MPa. Unit weight is 23.6 kN/m3 for concrete and 18.4 kN/m3 for the soil backfill. Calculate the ratio of the actual soil pressure to net effective pressure. (q/qeff ). Answer in four decimal places. (i.e. 1.6125, 1.5140, 0.8461, etc.)
The proposed design of a cantilever retaining wall is shown in Figure 1. The unit weight of concrete is 24kN/m³ and the soil has unit weight 18kN/m³. The soil peak strength parameters are c'-0, 6-32°. The soil behind the wall carries a uniform surcharge of 20kN/m². a) Calculate the safety factor for overturning (minimum required F.S.=2.0). b) Calculate the safety factor for sliding (minimum required F.S.=1.5). 1,35 0,40 Figure 1. 3,50m q-2t/m³ 5,00 m 1,75 m 0,40 m
A 1.6 m wide x 0.46 m thick RC footing is to be provided for a 250mm thick RC wall. The wall carries a dead load of 160 kN/m and a live load of 225 kN/m of the wall. The gross allowable soil pressure is 323 kPa. The bottom of the footing is 670 mm below the ground. Use f'= 21 MPa and f, = 420 MPa. Unit weight is 23.6 kN/m3 for concrete and 18.4 kN/m3 for the soil backfill. Diameter of main bars is 16mm and that of the shirnkage and temperature bars 10mm Calculate the ratio of the Demand Shear Force to Shear Capacity in one- way shear. Answer in four decimal places. (i.e. 1.6125, 1.5140, 0.8461, etc.)

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