# The maximum bending moment due to a train of wheel loads on a simply supported girder

A. Always occurs at centre of span

B. Always occurs under a wheel load

C. Never occurs under a wheel load

D. None of the above

**Answer: Option B **

__Solution(By Examveda Team)__

**1. Wheel Load:**When a train of wheel loads moves over a simply supported girder, the bending moment changes depending on the position of the wheel loads.

**2. Influence Line:**The influence line for bending moment indicates that the maximum bending moment occurs when the wheel load is at a specific point on the span.

**3. Critical Position:**For the maximum bending moment to occur, the critical position of the wheel load is generally at a distance from the support, calculated based on the span and the load distribution.

**4. Conclusion:**Hence, the maximum bending moment due to a train of wheel loads on a simply supported girder always occurs under a wheel load.

Therefore, the correct answer is

**Option B: Always occurs under a wheel load.**

B