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Question

# A flitched timber beam made up of steel and timber has a section as shown in figure below. The permissible stress in steel and timber are 100 N/mm2 and 5N/mm2 respectively. The moment of resistance of the beam is________kNm.

A
40
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B
14
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C
22
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D
6
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Solution

## The correct option is B 14Moment of resistance of timber section, MT=σT×ZT =5×(2×60×20026)=4 kNm Moment of resistance of steel section, Ms=σs×Zs =100×15×20026Nmm=10 kNm ∴Total moment of resistance of beam = 4 + 10 = 14 kNm

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