Abridge 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.

a) 22.5number

b) 22.22 m length

Explanation:

Given data:

Bridge length = 500 m

width of bridge = 12 m

Maximum temperature = 40 degree C

minimum temperature  = - 35 degree C

Maximum expansion can be determined as

where , \alpha is expansion coefficient degree C

SO,

number of minimum expansion joints is calculated as

b) length of each bridge

answer:

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the equation above shows how temperature f, measured in degrees fahrenheit, relates to a temperature c, measured in degrees celsius. based on the equation, which of the following must be true?

a temperature increase of 1 degree fahrenheit is equivalent to a temperature increase of

5

9

degree celsius.

a temperature increase of 1 degree celsius is equivalent to a temperature increase of 1.8 degrees fahrenheit.

a temperature increase of

5

9

degree fahrenheit is equivalent to a temperature increase of 1 degree celsius.

a) i only

b) ii only

c) iii only

d) i and ii only