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Plank dimension = 300 mm x 75 mm thick Plank allowable stresses: Bending = 10.4 MPa Shear = 0.8 MPa Unit weight of soil = 17.3 kN/m3 Active earth pressure coefficient, k,= 1/3 43. Which of the following gives the maximum flexural stress? а. 10.8 МРа b. 12.8 MPа 44. Find the maximum shear stress. а. 60 mm b. 70 mm 45. What should be the thickness (mm) of the planks to prevent failure? a. 0.17 MPa b. 0.29 MPа с. 14.2 МPа d. 16.7 MPa c. 80 mm d. 90 mm с. 0.33 МРа d. 0.41 MPa

Plank dimension = 300 mm x 75 mm thick Plank allowable stresses: Bending = 10.4 MPa Shear = 0.8 MPa Unit weight of soil = 17.3 kN/m3 Active earth pressure coefficient, k,= 1/3 43. Which of the following gives the maximum flexural stress? а. 10.8 МРа b. 12.8 MPа 44. Find the maximum shear stress. а. 60 mm b. 70 mm 45. What should be the thickness (mm) of the planks to prevent failure? a. 0.17 MPa b. 0.29 MPа с. 14.2 МPа d. 16.7 MPa c. 80 mm d. 90 mm с. 0.33 МРа d. 0.41 MPa

Structural Analysis
Structural Analysis
6th Edition
ISBN:9781337630931
Author:KASSIMALI, Aslam.
Publisher:KASSIMALI, Aslam.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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43) 14.2 MPa

44) 90 mm

45) 0.33 MPa

SITUATION 15. A temporary earth retaining wall consists of planks driven vertically into the ground. The wall is designed to resist 2.4 m of soil. Given: Plank dimension = 300 mm x 75 mm thick Plank allowable stresses: Bending = 10.4 MPa Shear = 0.8 MPa Unit weight of soil = 17.3 kN/m3 Active earth pressure coefficient, k,= 1/3 43. Which of the following gives the maximum flexural stress? с. 14.2 МPа d. 16.7 MPa а. 10.8 МPа b. 12.8 MPa 44. Find the maximum shear stress. c. 80 mm d. 90 mm а. 60 mm b. 70 mm 45. What should be the thickness (mm) of the planks to prevent failure? с. О.33 МРа d. 0.41 MPa а. 0.17 МРа b. 0.29 MPa
Transcribed Image Text:SITUATION 15. A temporary earth retaining wall consists of planks driven vertically into the ground. The wall is designed to resist 2.4 m of soil. Given: Plank dimension = 300 mm x 75 mm thick Plank allowable stresses: Bending = 10.4 MPa Shear = 0.8 MPa Unit weight of soil = 17.3 kN/m3 Active earth pressure coefficient, k,= 1/3 43. Which of the following gives the maximum flexural stress? с. 14.2 МPа d. 16.7 MPa а. 10.8 МPа b. 12.8 MPa 44. Find the maximum shear stress. c. 80 mm d. 90 mm а. 60 mm b. 70 mm 45. What should be the thickness (mm) of the planks to prevent failure? с. О.33 МРа d. 0.41 MPa а. 0.17 МРа b. 0.29 MPa
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