Question

65 kN 45 kN/m 35 kN/m DI El A36 Steel . Factor of safety must be 3.0 with respect to yielding in tension or compression and 3.5 with respect to yielding irn shear. . Determine which beam will be lightest. 1) Draw a shear force and moment diagrams of the beam with maximums shown and non -linear curves shown. 2) Tentatively select a beam based on max normal stress 3) Check the tentatively selected beam for max shear 4) Find and identify the locations on the beam where shear and moment can combine to exceed allowable stresses. 5) Find principal stresses at locations identified to ensure allowable stress is not exceeded 6) Explain how the beam selected is within the factor of safety and the lightest shown.

Answer 1

icld strery th f A3 steel is ex is 25o MPa. Equiralenk beam 35 135 At 1.5 2 m 1.5 Rat Rp 13 54c5+35 = 235-0 BeMot abou p 135 x6. 5 - 5X2 t 35X 5

65 3m 3m SF 13+5 35 5.62 52 2i 2.653

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