When a series of wheel loads crosses a simply supported girder, the maximum bending moment under any given wheel load occurs when_____. | Civil Engineering MCQ's

A.    the center of gravity of the load system is midway between the center of span and wheel load under consideration
B.    the center of span is midway between the center of gravity of the load system and the wheel load under consideration
C.    the wheel load under consideration is midway between the center of span and the center of gravity of the load system
D.    none of the above

Ans: B