Question

A train of concentrated loads as shown moves from left to right on a simply supported beam of span 6m. Determine the absolute maximum bending moment developed in the beam if the train can cross the beam

• A. 91.67 kN-m
• B. 176.67 kN-m
• C. 140 kN-m
• D. 150 kN-m

Answer 1

The correct option is B 176.67 kN-m

Let us first of all draw ILD for maximum BM.

Maximum BM at ‘C’ will occur only when the 120 kN load acts on this point

$(M_C{)}_{max}=120\times 1+80\times \frac{1}{3}+90\times \frac{1}{3}=176.67kN-m$