Question
Download Solution PDFAccording to IS 800:2007, steel purlins are primarily designed as _________
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFExplanation:
- Purlins are designed as continuous beams because they span over more than two truss joint and are supported by rafters
- The principal rafter is the top chord member of the truss and is subjected to compressive forces from loads transferred by purlins at the nodes
- The rafters act as simply supported beams between the purlins.
- The purlins are interconnected by a sag rod or tie rod at the centre span of the purlin to reduce bending moment and deflection in the purlin
Additional Information
- A beam is expected to resist bending and shear stresses Bending stress Is zero at centre and maximum at the top and bottom layer of the beam.
- While shear stress is maximum at the centre andzero at top and bottom layers.
- In I section, the web resists shear forces, while the flanges resist more than 80% of the bending moment.
- Beam theory shows that the I-shaped section is a very efficient form for carrying both bending and shear loads in the plane of the web
- Even though the l-cross-section has a reduced capacity in the transverse direction, and is also inefficient in carrying torsion, for which hollow structural sections are often preferred, the latter are more complicated and expensive to manufacture.
Last updated on May 28, 2025
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