Principles of Geotechnical Engineering (MindTap Course List)
9th Edition
ISBN: 9781305970939
Author: Braja M. Das, Khaled Sobhan
Publisher: Cengage Learning
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Chapter 14, Problem 14.14P
The elevation and plan of a bracing system for an open cut in sand are shown in Figure 14.21. Using Peck’s empirical pressure diagrams, determine the design strut loads. Given: γsand = 18 kN/m3, ϕ' = 38°, x = 3 m, z = 1.25 m, and s = 3 m.
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Braced Cuts
Situation 1| An overhang beam is loaded as shown below. The beam cross-section
was built by attaching two (2) channels to a 9mm thick plate using 16mm rivets.
The property of the channel is given below:
Depth, D = 225 mm
Flange Thickness, t; = 9mm
Flange Width, B, =112.5 mm
Web Thickness, t, =9 mm
The allowable flexural stress on the beam is 180 MPa. Rivets has a capacity of t=
100 MPa on shear, for bearing, o,=200 MPa on single shear, o, =260MPA on double
shear.
a. Determine the maximum shearing stress on the beam
in MPa
b. Determine the flexural stress, in MPa, on the fiber
above 30mm above N.A at distance 1m from A.
c.Determine the shearing stress, in MPa, on the fiber
above 30mm above N.A at distance 1m from A.
225
P= 8
P= 10
9,- 18
H3
2 (m)
1 (m) .
4.50 (m)
1.50 (m)
Chapter 14 Solutions
Principles of Geotechnical Engineering (MindTap Course List)
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- Determine the factor of safety against bottom heave for the braced cut described in Problem 15.18. Use Eqs. (15.66) and (15.70). For Eq. (15.70), assume the length of the cut, L = 18 m. 15.18 Refer to Figure 15.51 in which = 17.5 kN/m3, c = 60 kN/m2, and center-to-center spacing of struts is 5 m. Draw the earth pressure envelope and determine the strut loads at levels A, B, and C. FIG. 15.51arrow_forwardUsing portal method, Calculate for the shear force in kN at member FC a = 12.6 kN, b = 27.2 kN, c = 3.5 m, d = 5.0 m, e = 5.4 marrow_forwardSituation 1| An overhang beam is loaded as shown below. The beam cross-section was built by attaching two (2) channels to a 9mm thick plate using 16mm rivets. The property of the channel is given below: Depth, D = 225 mm Flange Thickness, t, = 9mm Flange Width, B; =112.5 mm Web Thickness, tw=9 mm The allowable flexural stress on the beam is 180 MPa. Rivets has a capacity of t= 100 MPa on shear, for bearing, o,=200 MPa on single shear, o,-260MPA on double shear. 1. Determine the location of centroid, y, from top of the beam in mm. 2. Determine the moment of inertia, I, of the section in mm“. 3. Determine the maximum allowable moment, Mall, in kn-m, base on the beam's cross-section.arrow_forward
- Example 7: Determine the factor of safety of the bottom against heave for the very long braces system shown below. Make reasonable assumptions if necessary. 10 kN/m? B= 5m Ø =33° Y = 18 kN/m H=4m Sand 3 3 qu = 80 kN/m² Y= 19 kN/m³ H=4m Clayarrow_forwardI need detailed explanation solving this exercise from Foundation Engineering, step by step please.arrow_forwardQ-3 For the braced sheeting system shown below, calculate the forces in struts A, B , C and D. Assume hinged at B and C, and the center to center spacing between struts longitudinally is 3 meter. The soil behind the braced system is coarse grained soil. 5 m 10.5 m Coarse-grained soil Y = 17.5 kN/m , = 31° 1.5 m 1.5 m 1.5 m 0.8 marrow_forward
- Situation 1| An overhang beam is loaded as shown below. The beam cross-section W was built by attaching two (2) channels to a 9mm thick plate using 16mm rivets. The property of the channel is given below: Depth, D = 225 mm Flange Thickness, t, = 9mm %3D Flange Width, B, =112.5 mm Web Thickness, t, =9 mm The allowable flexural stress on the beam is 180 MPa. Rivets has a capacity of t= 100 MPa on shear, for bearing, o,=200 MPa on single shear, o, =260MPa on double shear. 1. Determine the location of centroid, 9, from top of the beam in mm. 2. Determine the moment of inertia, I, of the section in mm“. 3. Determine the maximum allowable moment, M,l, in kn-m, base on the beam's cross-section. 4. Determine the location of the maximum moment on the beam in meters. 5. Determine the maximum moment, in kN-m, on the beam. 6. Determine the maximum flexural stress on the beam in MPa. 7. Determine the maximum shearing stress on the beam in MPa. 8. Determine the flexural stress, in MPa, on the fiber…arrow_forwardSituation 9: An 8m deep braced cuts in medium clay is shown. The unit weight = 16.5 kN/m3 and the undrained shear strength Cu = 27.8 kPa. In the plan, the struts are placed at spacing 2.4m center to center. Using Peck's Empirical pressure diagram: m 0.25H 2m В H= 8 m 0.75 H 2|m 2|m Pa = yh - 4Cu %3D 41. Compute the actual load on strut A. A. 124.57 kN C. 116.47 kN B. 153.48 kN D. 162.81 kN 42. Compute the actual load on strut B. А. 33.29 kN C. 28.42 kN B. 40.54 kN D. 35.29 kN 43. Compute the actual load on strut C. A. 127.92 kN C. 131.95 kN B. 210.38 kN D. 199.68 kNarrow_forwardConsider a rectangular footing and loading conditions shown in the figure below. The foundation rests on the ground surface (not embedded). If a column applies an eccentric vertical load equal to 300 kN and a moment about the y axis equal to 400 kN.m in the direction depicted in the Figure below, calculate the bearing pressure at point A in kPa. Assume that the weight of the footing is 450 kNarrow_forward
- Consider a beam ABCD to be designed for an ultimate uniformly distributed load of 24.9 kN/m and a two-point load of 41.251 kN as shown in figure 2. The beam is simply supported at A, B, C and fixed at D. Determine the required plastic moment and select a suitable I- section by using steel table. If the yield stress =250N/mm2.arrow_forwardA reinforced rectangular beam with width 437.5 and effective depth 692.5 is subjected to service liveand dead loads (self-weight included) of 56 and 70.5, respectively. If required, compressionsteel bars are to be placed at a distance d′ = 692.5 from the extreme compression fiber. Use ??′ =28 ??? and ??= 420 ???. Compute the following: 1. Solve for the area of tension steel bars using ?? = 0.004.2. Solve for the area of compression steel bars using ?? = 0.004.3. Solve for the area of tension steel bars using ?? = 0.005.4. Solve for the area of compression steel bars using ?? = 0.005arrow_forward1. Determine the force F per metre width (into the page) of the rectangular prismatic concrete block shown on the figure below, that would lead to sliding of the block. The water depth is 10m and the unit weight of concrete is 24 kN/m³. 10m 5m 2.5m Sand sea bed, d=p²=35°arrow_forward
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How to build angle braces; Author: Country Living With The Harnish's;https://www.youtube.com/watch?v=3cKselS6rxY;License: Standard Youtube License