The 'yield line theory' for slabs (Johansen) calculates:
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Deflection at service load
Collapse load by energy method — yield line pattern gives plastic mechanism; external work = internal plastic hinge work
Shear capacity of flat slab only
Creep coefficient of concrete
Correct Answer
B. Collapse load by energy method — yield line pattern gives plastic mechanism; external work = internal plastic hinge work
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Yield line method: upper bound (kinematic) method for slab collapse load. Yield lines form at most-stressed sections; rotations along these lines define mechanism. External work (load × displacement) = internal work (Mp × rotation per unit length × yield line length). Collapse load = minimum from all possible yield line patterns. Gives design moment for two-way slabs under any loading pattern.
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