532CHAPTER 6Stresses in Beams (Advanced Topics)Problem 6.5-5A beam made up of two unequal leg angles is subjected to a bending moment Mhaving its vector at anangle uto the zaxis (see figure part a).(a) For the position shown in the figure, determine the orientation of the neutral axis and calculate the maximum tensilestress stand maximum compressive stress scin the beam. Assume that u±30° and M±30 k-in.(b) The two angles are now inverted and attached back-to-back to form a lintel beam which supports two courses of brickfaçade (see figure part b). Find the new orientation of the neutral axis and calculate the maximum tensile stress standmaximum compressive stress scin the beam using u±30° and M±30 k-in.(a)yMzCin.34—uL5 ²3²12—12—(b)yMzCLintel beam supporting
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Second moment of area, Truss, maximum tensile stress, Compressive stress