The percentage of reinforcement in case of slabs, when high strength deformed bars are used is not less than
A. 0.15
B. 0.12
C. 0.30
D. 1.00
Answer: Option B
Solution (By Examveda Team)
The Indian Standard IS 456:2000 specifies minimum reinforcement in slabs. When high-strength deformed (HYSD) bars are used, the minimum steel in either direction shall not be less than 0.12% of the gross cross-sectional area (bD).For comparison, when plain/mild steel is used the minimum is 0.15% — the reduction to 0.12% is permitted because HYSD bars have higher yield strength and provide equivalent ductility with slightly less area of steel.
This requirement (clause on minimum reinforcement for slabs) ensures adequate cracking control and ductile behaviour of slabs while taking advantage of HYSD bar properties.
This Question Belongs to Civil Engineering >> Concrete Technology And Design Of Concrete Structures
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Comments (1)
In symmetrically reinforced sections, shrinkage stresses in concrete and steel are respectively
A. Compressive and tensile
B. Tensile and compressive
C. Both compressive
D. Both tensile
Critical section for shear in case of flat slabs is (adopting standard notations)
A. At a distance of effective depth of slab from periphery of column/drop panel
B. At a distance of $$\frac{{\text{d}}}{2}$$ from periphery of column/capital/drop panel
C. At the drop panel of slab
D. At the periphery of column
A. depends on as, only
B. depends on aCbC only
C. depends on both crst and acbc
D. is independant of both ast and acbc where d is the effective depth, ast is per-missible stress in steel in tension and ocbc is permissible stress in concrete in bending compression.
The diameter of ties in a column should be
A. More than or equal to one fourth of diameter of main bar
B. More than or equal to 5 mm
C. More than 5 mm but less than one-fourth of diameter of main bar
D. More than 5 mm and also more than one-fourth of diameter of main bar
0.15 % for only deformed bars. Please verify ?