The 'effective slenderness ratio' for a single angle compression member (IS 800) connected through one leg is:
Choose the correct answer
L/r_min × 2.0 (more conservative)
0.85 × (L/r_min) — gusset provides partial end restraint to single-leg-connected angle compression member
Same as fully restrained strut: 0.5×L/r
L/r_vv without any reduction
Correct Answer
B. 0.85 × (L/r_min) — gusset provides partial end restraint to single-leg-connected angle compression member
Why is this the answer?
IS 800 Cl. 7.5.2.2: for angle sections connected through one leg only, effective slenderness ratio = 0.85×(L/r_min) for equal angles or 0.85×L/r_vv for unequal angles connected through shorter leg. r_min or r_vv = minimum radius of gyration. The 0.85 factor accounts for end restraint from gusset connection. If connected through both legs: standard (L/r_min). For double angles back-to-back, use 0.85×L/r_min.
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