The economic spacing of a roof truss depends upon the
  • a)
    cost of purlins and cost of roof covering
  • b)
    cost of roof covering and dead loads
  • c)
    dead loads and live loads
  • d)
    live loads and cost of purlins
Correct answer is option 'A'. Can you explain this answer?

Civil Engineering (CE) Question

2 Answers
Shweta Gupta answered Feb 05, 2019
Economic passing of the truss is spacing that makes the overall cost of trusses,
purlins, roof covering etc minimum. It depends upon the relative cost of trusses, cost
of purlins, cost of roof covering and spacing of truss etc.
t = 2p + r
t = Cost of truss per unit area
P = Cost of purlin per unit area
r = Cost of roof covering per unit area

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