Mechanics of Materials, 7th Edition
7th Edition
ISBN: 9780073398235
Author: Ferdinand P. Beer, E. Russell Johnston Jr., John T. DeWolf, David F. Mazurek
Publisher: McGraw-Hill Education
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Chapter 6.6, Problem 77P
6.77 and 6.78 A thin-walled beam of uniform thickness has the cross section shown. Determine the dimension b for which the shear center O of the cross section is located at the point indicated.
Fig. P6.77
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L/4
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A timber beam AB of length L and rectangular cross section carries a
uniformly distributed load w and is supported as shown. (a) Show that
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stresses in the beam is equal to 2h/L, where h and L are, respectively,
the depth and the length of the beam. (b) Determine the depth h and
the width b of the beam, knowing that L = 5 m, w = 8 kN/m,
Tm = 1.08 MPa, and om = 12 MPa.
Chapter 6 Solutions
Mechanics of Materials, 7th Edition
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- Show all work don’t skip steps and show all units.arrow_forwardP.16.4 A thin-walled cantilever with walls of constant thickness t has the cross- section shown in Fig. P.16.4. It is loaded by a vertical force W at the tip and a horizontal force 2W at the mid-section, both forces acting through the shear centre. Determine and sketch the distribution of direct stress, according to the basic theory of bending, along the length of the beam for the points 1 and 2 of the cross-section. The wall thickness t can be taken as very small in comparison with d in calculating the sectional properties Lxx, Ixy, etc. Ans. 2,1 (mid-point) = -0.05 Wl/td², 02,1 (built-in end) = -1.85 Wl/td² ₂2 (mid-point) = -0.63 W1/td², 02 (built-in end) = 0.1 Wl/td². /////// Fig. P.16.4 W 7/2 2W 1/2 A 2 d12_ _d12. 3 Xarrow_forwardA timber beam AB of length L and rectangular cross section carries a single concentrated load P at its midpoint C. (a) Show that the ratio Tm/ m of the maximum values of the shearing and normal stresses in the beam is equal to h/2L, where h and L are, respectively, the depth and the length of the beam. (b) Determine the depth h and the width b of the beam, knowing that L = 2 m, P = 40 kN, 7m = 960 kPa, and om = 12 MPa.arrow_forward
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