6. A rectangular 12m x 9m coal pillar is located 100m below surface. Panel road widthsare 7m, mining height is 2.5m. Panel encounters a dolerite sill and the load increasesby 15%.i.Calculate the load and safety of the pillar.ii.Calculate the thickness of the dolerite sill and new safety factor.iii.Discuss the controllable parameter/s in regards to enhancing the stability ofthe beam in the roof.

The question is based on the rectangular coal pillar located below the surface. The dimension of the…

Answered: 6. A rectangular 12m x 9m coal pillar…

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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Problem The composite bar system in Figure 4.8 consists of a steel bar and a bronze bar that are both securely attached to a rigid block and rigid supports. The system is loaded with a total load P at the rigid block. If the total applied load P=42000 lb, determine the stresses in the two bars. 6′ S TE FIGURE 1.48 Composite bar system for Problem 12. Steel bar } Rigid block -} Bronze bar E₂ = 30 x 10º psi A₂ = 1 in² E-15 x 10 psi Ag-4 in²
Describe about the Subsurface stresses relating to the at-rest condition.
11. (a) Plot Mohr envelopes of strength for (1) = 0°, (2) = 30°, (3) = 60°, and (4) = 90° for the slate whose strength anisotropy is described by Equation 3.18a and 3.19a. (b) Plot the peak compressive strength of the slate as a function of for (1) 03 = 0 and (2) σ3 = 30 MPa.
1) A box beam has the following dimensions: h = 500 mm, b = 180 mm, and t = 22 mm. If the yield stress is 270 MPa, what is the yield moment? (Express your answer in kN-m, up to 1 decimal place) 2) A box beam has the following dimensions: h = 500 mm, b = 180 mm, and t = 22 mm. If the yield stress is 270 MPa, what is the shape factor? (Express your answer up to 1 decimal place)
(4) Two kids (200 N each) are balanced on a seesaw. Plane a-a (containing Point A) is just left of the pin support. Plane b-b (containing Point B) is just right of the pin support. Illustrate the combined state of stress at Point A and at Point B on the two stress cubes below. (Yes, compute values, of course.) Ans. 214 kPa 1.2m 1.2m Point A (on plane a-a): x y ^y 4 200 N A SEESAW GIVEN: Iy= 2.488 E6 mm 4 I₂0.9338 E6 mm 4 12 14 14 12 N 12 ib 33 лу 33 x 2000 Points A&B dims. in mm Point B (on plane b-b): ^y ------ NA x ----- N
Problem The composite bar system in Figure 4.8 consists of a steel bar and a bronze bar that are both securely attached to a rigid block and rigid supports. The system is loaded with a total load P at the rigid block. If the total applied load P=42000 lb, determine the stresses in the two bars. 6′ S TE FIGURE 1.48 Composite bar system for Problem 12. Steel bar } Rigid block -} Bronze bar E₂ = 30 x 10º psi A₂ = 1 in² E-15 x 10 psi Ag-4 in²
Provide your reasons why the shape of the shear strength function is not similar to that of permeability function.
If the 2-in.-diameter shaft is made from cast iron having tensile and compressive ultimate stress of 1sult2t = 50 ksi and 1sult2c = 75 ksi, respectively, determine if the shaft fails according to Mohr’s failure criterion.
Note:Last time I was received incomplete solution.. I need Torque diagram and required shaft diameter.. Otherwise I will dislike... Thank you
Problem #3: A circular shaft, fixed to the wall, is loaded as indicated in the figure below. Using all three failure criteria (Rankine's theory, Tresca criterion, and Von Mises criterion), determine the load magnitude, R, that causes yielding at point A on the cross-section. Assume the yield strength of the material is 64 ksi. Notes: . . ● Point A is at the mid-depth of the section and on the leftmost fiber (as viewed below). At the fixed base, the shaft will be subjected to a bending moment, a torsional moment, a shear force, and a normal force. Recall for a circular cross-section; 1=d¹ and/=d. Q does not need to be provided, as you should see herein. A 3 ft R 4 in. F T 2 ft 12R X
An aluminum alloy pipe with an outside diameter of 4.0 in. and a wall thickness of 6/16 in. cantilevers upward a distance of L = 12 ft. The pipe is subjected to a wind loading that increases from wA = 11 lb/ft at its base to wB = 17 lb/ft at its tip. (a) Compute the maximum value of Q for the pipe. (b) What is the maximum vertical shear stress in the pipe?

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