Q.

Which of the following is true for economic spacing?

A. cost of trusses should be equal to twice the cost of purlins
B. cost of trusses should be equal to twice the cost of purlins minus cost of roof coverings
C. cost of trusses should be equal to the cost of purlins plus cost of roof coverings
D. cost of trusses should be equal to twice the cost of purlins plus cost of roof coverings
Answer» D. cost of trusses should be equal to twice the cost of purlins plus cost of roof coverings
Explanation: for economic spacing of roof trusses, the cost of trusses should be equal to twice the cost of purlins plus cost of roof coverings. this equation is used for checking the spacing of trusses and not for design of trusses.
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