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Question

Four wheel loads of 6 kN, 4 kN,8kN and 5 kN cross a girder of 20 m span followed by uniformly distributed load of 4 kN/m and 4 m long with the 6 kN load leading. The magnitude of bending moment at a section 8 m from the left support is kNm.



  1. 108.4

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Solution

The correct option is A 108.4


Ordinate of influence line for BM at C=8×1220=4.8m
Ordinate under 5 kN load =4.812×7=2.8m
Ordinate under 4 kN load =4.812×10=4.0m
Ordinate under 5 kN load =4.88×6=3.6m
Ordinate under head of UDL =4.88×4=2.4m
MC=(6×2.8)+(4×4)+(8×4.8)+(5×3.6)+(12×2.4×4×4)
=108.4kNm


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