In reference to determining the effective length for Lateral Torsional Buckling, for cantilever beams of projecting length L, the effective length LLT is determined from the different support conditions. Match the correct support conditions with their respective diagram shown in the figures below: 1. Continuous with lateral restraint on the top flange 2. Continuous with partial torsional restraint 3. Continuous with lateral and torsional restraint 4. Restrained laterally, torsionally and against rotation on plan (Figures A, B, C, D are shown in the diagram.)
- A1-A, 2-B, 3-C, 4-D
- B1-B, 2-C, 3-D, 4-A
- C1-B, 2-D, 3-A, 4-CCorrect
- D1-D, 2-A, 3-B, 4-C
Solution
Concept
Support conditions of cantilevers (IS 800 Table 15)
Step-by-step solution
1. The four support conditions of IS 800 Table 15 are matched to the figures. 2. The pairing 1-B, 2-D, 3-A, 4-C is the one given in the key.
Explanation
The figures must be read to pair the support conditions.
Why the other options are wrong
Other pairings do not agree with the key.
Correct answer: C) 1-B, 2-D, 3-A, 4-C