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4 3 SI units A bridge to be fabricated of steel girders is designed to...

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4 3 SI units A bridge to be fabricated of steel girders is designed to be 500 m long and 12 m wide at ambient temperature assumed 20 C Expansion joints will be provided to compensate for the change in length in the girders as the temperature varies Each expansion joint can compensate for a maximum of 20 mm of change in length From historical records it is estimated that the minimum and maximum temperatures in the region will be 35 C and 40 C respectively Determine a the minimum number of expansion joints required and b the length that each bridge section should be fabricated The coefficient of thermal expansion a 12 10 6V C for steel

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