212-Chpt 8

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EXAMPLE 8.2A force of 15 000 N is applied to the edge of the member shown in Fig. Neglect the weight of the member and determine the state of stress at points B and C.

EXAMPLE 8.4The member shown in Fig.. 8-5a has a rectangular cross section. Determine the state of stress that the loading produces at point C

EXAMPLE 8.6The rectangular block of negligible weight in Fig. is subjected to a vertical force of 40 kN, which is applied to its corner. Determine the normal-stress distribution acting on a section through ABCD.

PROBLEMS CHAPTER 88-22. The vertical force P acts on the bottom of the plate having a negligible weight. Determine the maximum distance d to the edge of the plate at which it can be applied so that it produces no compressive stresses on the plate at section aa. The plate has a thickness of 10 mm and P acts along the centerline of this thickness.

8-25. The stepped support is subjected to the bearing load of 50 kN. Determine the maximum and minimum compressive stress in the material.

8-30. The block is subjected to the two axial loads shown. Determine the normal stress developed at points-A and B. Neglect the weight of the block. 8-31. The block is subjected to the two axial loads shown. Sketch the normal stress distribution acting over the cross section at section aa. Neglect the weight of the block.

8-34. The wide-flange beam is subjected to the loading As shown. Determine the stress components at points A and B and show the results on a volume element at each of these points. Use the shear formula to compute the shear stress.

8-60. The masonry pier is subjected to the 800-kN load. If x = 0.25 m and y = 0.5 m, determine the normal stress at each corner A, B, C, D (not shown) and plot the stress distribution over the cross section. Neglect the weight of the pier.

-34. A cast iron block is loaded as shown in the figure. Neglecting the weight of the Hock, determine the stresses acting normal to a section taken 0.5 m below the top and locate the line of zero stress. All dimensions given in the figure are in mm. An: 24.6 MPa, 9.6 MPa.

-35. An aluminum-alloy block is loaded as shown in the figure. The application of this load produces a tensile strain el 500 x l0 mm. per mm at A as measured by means of an electrical strain gage. Compute the magnitude of the applied force P. Let E = 10 x 106 kN/.nZ. All dimensions given in the figure are in mm.

-21. A steel frame fabricated from W 200 X 25 steel sections supports a load P at a distance d from the center of the vertical column as shown in the figure. On the outside of the column at a distance 1.5 m from the ground the following strains were measured at A, = 200 x 10 -6 m per meter; and at B, = - 600 x 10 -6 per meter. What arc the magnitudes of the load P and the distance d ? Let E 200 GPa. Ans: 129 kN, 0.143 m.