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How to solve For this problem, you may ignore the effect of shear stress on the cross-section, and treat the beam as though each point on the cross-section is in a state of uniaxial tension or compression (depending upon whether point is above or below neutral axis). Hence, based on either the maximum shear stress (MSS) theory or ductile Coulomb-Mohr (DCM) theory (which are each relevant to the ductile materials of Table A-22), the effective stress is equal to the maximum bending stress given above. (b) Compute the average shear stress on the cross-section (which is just the weight divided by the area), for your optimal beam. How does this value compare with the bending stress?