give reason =Why are the girders supporting the bridge not fixed in the walls of the pillars
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One end of the girders is fixed into the concrete or brick pillars and its other end is not fixed , but is placed on rollers. The reason is that if there us any rise ( or fall ) in temperature of the atmosphere, the girder can freely expand ( or contract) without affecting the pillars.
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The girders supporting the bridge are not fixed in the walls of the pillars. Because, they expand on heating and contract on cooling, and in doing so,they can break the pillars. Thus, the bridge can get damaged.
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