Question

One end of a steel girder in a bridge is not fixed, but is kept on rollers. Give the reason.

Answer 1

One end of a steel girder in a bridge is not fixed but is kept on rollers. If there is any change in temperature of the surrounding, the length of bridge may also change due to the thermal expansion due to heat. The girder is kept on roller so that it can accommodate the variation in length of bridge without affecting the pillars.