When purlins are placed between panel points the principal rafter is to be designed for?
Answers
Purlin and rafter are the basic members of any roof structure. They are the load transmitting members of the steel roof. They transmit the live load, dead load , wind load (which is considerable in large steel structures with low permiability ) and other loads acting on them to the roof truss situated below them which eventually transfers the load to the columns and then evenualy to the foundation.
So basicallh purlin and rafter are like two way reinforcements of the roof . Purlins are one which are parallel to the ridge line or we can say they run along the span of the roof while rafters are perpendicular (plan) to the ridge line of the roof truss .
Placements-The roof truss is supported on the columns and the rafter is supported on the roof truss upon which the purlins are bolted/welded and upon the purlins lies the final covering material which may be asbestos sheet or cement asbestos sheet. Also note here that the rafters are present only where the truss are not present to support the purlins
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