The three cross-sections shown in Figure A12 have the same cross-sectiona area and are subjected to the same bending moment about their horizontal axis of symmetry. Section (a) is a square section. Sections (b) and (c) are composed of two rectangular sections that are placed loosely next to each other. If σå, σ and are their respective maximum bending stresses on the three sections, which one of the following relations is correct? 2a 2a 2a a a 2a (a) (b) а) ба<оо сос b) σa=0₂ < oc c) a< 0b = 0c d) a = b = c Figure A12 (c) Toro a a

Any functioning component, such as machine parts, structural members, pressure vessels, and so on, are all under the influence of more than one force. When anybody is under the influence of more than one force such as shear forces, bending moments, axial…