The 'lacing' in a built-up compression member (back-to-back channels) is designed to resist:
Choose the correct answer
Only the axial compression load
Transverse shear of 2.5% of axial load — prevents individual components from buckling independently
Wind load on the column face only
Thermal expansion of the steel
Correct Answer
B. Transverse shear of 2.5% of axial load — prevents individual components from buckling independently
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Lacing bars in built-up columns: connect individual components (channels, angles) laterally. Must resist: (1) Shear force = 2.5% of axial load (IS 800 Cl. 7.6.5); (2) Forces from transverse loading. Single/double lacing: IS 800 limits: inclination 40°–70° from axis; slenderness of lacing bars ≤ 145. Lacings prevent individual components from buckling independently.
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