why is one end of the beams of steel bridge kept on a roller instead of fixing a pillar
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Explanation:
The End Of Beams Of Steel Bridge Are Kept On Roller, Because On A Hot Day Every Object Including Metal Expand If It Would Be Attached To A Pillar Their Will Be Bends On Bridge So Avoiding This The Roller Are Fixed To Tackle This Problem So If They Expand Slightly It Doesnt Problem.
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