Yield line theory for slabs gives:
Choose the correct answer
A conservative (lower bound) estimate of collapse load
An upper bound (unsafe) estimate of collapse load
The exact collapse load
A lower bound of deflection
Correct Answer
B. An upper bound (unsafe) estimate of collapse load
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Yield line theory (Johansen) is an upper bound plastic analysis method. The assumed yield line pattern may not be the critical one, so the computed collapse load may be higher than the true value (unsafe). The correct mechanism gives minimum collapse load.
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