Which of the following characteristics are useful in the yield line patterns for slab with various boundary conditions? 1. Yield lines are curvilinear lines so that they may act as plastic hinges 2. Yield lines terminate at the slab boundary or at intersection of other yield lines 3. Yield lines may form along the support if an edge is fixed or continuous Select the correct answer.
- A1 and 2 only
- B1 and 3 only
- C2 and 3 onlyCorrect
- D1, 2 and 3
Solution
Concept
Characteristics of yield lines
Step-by-step solution
1. Yield lines are straight lines (not curvilinear), so statement 1 is false. 2. They end at the slab boundary or at the intersection with another yield line (statement 2 true). 3. Negative yield lines form along fixed or continuous supports (statement 3 true).
Explanation
In yield line analysis the slab breaks into rigid plane segments separated by straight yield lines that act as plastic hinges.
Why the other options are wrong
Statement 1 is wrong because yield lines are straight, so options containing it are wrong.
Shortcut
Yield lines: straight; end at boundary or other yield line; negative along fixed edges.
Common mistake
Assuming curved yield lines.
Correct answer: C) 2 and 3 only