Question

A simply supported beam of width 100 mm, height 200 mm and length 4 m is carrying a uniformly distributed load of intensity 10 kN/m. The maximum bending stress (in MPa) in the beam is __________ (correct to one decimal place).

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Answer :

30


Maximum bending moment will be at centre.

                            Maximum B.M.M =  wL²/8 =  10*16/8 = 20kNm

(L=4)

Maximum bending stress

   σmax = Mymax/I = 20*103*0.1/(0.1*0.2³/12)

                                = 30*106 N/m² = 30MPa

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