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Question

The cross-section of a beam is shown in figure -I. Its Ixx is equal to 3×106mm4. It is subjected to a load as shown in figure-II. The maximum tensile stress in the beam would be :


A
indeterminable as data is insufficient
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B
21MN/m2
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C
21kN/m2
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D
21NN/m2
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Solution

The correct option is B 21MN/m2
BMD of beam


Upper fibres of the beam will be under tension since the maximum BM of 0.9 kN-m is hogging in nature. The maximum tensile stress

f=My1Ixx=0.9×106×703×106

=9×73=21N/mm2=21MN/m2

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