RCC Structures Design
An under-reinforced section means

Steel is provided at the underside only
Steel will yield first
Steel provided is insufficient
Steel provided on one face only

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RCC Structures Design
According to I.S. : 456, slabs which span in two directions with corners held down, are assumed to be divided in each direction into middle strips and edge strips such that the width of the middle strip, is

Two-third of the width of the slab
Half of the width of the slab
Three-fourth of the width of the slab
Four-fifth of the width of the slab

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