The 'industrial shed' portal frame in steel transfers roof loads to foundations by:
Choose the correct answer
Only tension in cables from roof to walls
Roof sheet → purlins → rafters → rigid eave joint → columns → base plate → foundation (moment at rigid eaves)
Only vertical compressive force directly to column base
Suspension system from ridge beam
Correct Answer
B. Roof sheet → purlins → rafters → rigid eave joint → columns → base plate → foundation (moment at rigid eaves)
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Portal frame (industrial shed): rafters (inclined beams) + vertical columns rigidly connected. Load path: roof sheet → purlins → rafters → eaves (haunch) → columns → base plate → foundation. Rigid eave joint transfers moment → columns have base moments (fixed base) or zero (pinned base). Haunch at eave: deepens section where moments are maximum. IS 800 Cl. 11 covers gantry girders/portal frames.
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