why are the griders 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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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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