The output of a tower crane is best expressed in terms of:
Choose the correct answer
m³ of concrete placed per day
Tonne-metres per hour (load × radius of lift)
Number of lifts per 8-hour shift
Metres of reach per operation
Correct Answer
B. Tonne-metres per hour (load × radius of lift)
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Tower crane capacity depends on both the load lifted and the radius at which it is lifted (due to the load moment). A crane rated at 100 tonne-metres can lift 10 tonnes at 10 m radius or 5 tonnes at 20 m radius. Specifying output as tonne-metres/hr captures this variable capacity correctly.
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