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Identify the FALSE statement from the following, pertaining to the design of concrete structures -
Question

Identify the FALSE statement from the following, pertaining to the design of concrete structures -

A.

The assumption of linear strain profile in flexure is made use of in both working stress design method and limit state design method.

B.

Torsional reinforcement is not required to be provided at the corners of simply supported rectangular slabs, if the corner are free to lift up.

C.

A rectangular slab, whose length exceeds twice its width, always behave as two way slab, regardless of the support conditions.

D.

In case of staircase design, the dead weight of the steps is calculated by treating the step to be an equivalent horizontal slab of thickness equal to half of rise.

Correct option is C

Whether a rectangular slab behaves as one-way or two-way depends on the span ratio and the support conditions (edge continuity and stiffness), not only on geometric proportion. The usual rule-of-thumb is:
If LB2=>two-way action likely,If LB>2=>one-way action likely\text{If } \frac{L}{B} \le 2 \Rightarrow \text{two-way action likely}, \quad\text{If } \frac{L}{B} > 2 \Rightarrow \text{one-way action likely}
Therefore a slab with length greater than twice its width does not always behave as two-way — in fact it typically behaves as one-way unless edge/support conditions force two-way bending.​​

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