Problem 4 The beam AB is subjected to the uniformly distributed load shown and to two unknown forces P and Q. Knowing that the bending moment is +800 Nm at D and +1300 Nm at E, (a) determine P and Q, (b) draw the shear and bending-moment diagrams for the beam. 20 kN/m Mc P D E 0.3 m 0.3 m 0.3 m 0.3 m B (a) Internal forces (positive shear and positive bending moment)

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Beams

In structural engineering, a beam is a component made of a variety of materials (including steel alloys, and wood) that can resist loads applied laterally to the beam axis. Members, elements, rafters, shafts, and purlins are all terms used to describe beams.