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
Answer: Option B
This Question Belongs to Civil Engineering >> Concrete Technology And Design Of Concrete Structures
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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
In Concrete:
Concrete tries to shrink but is restrained by the steel reinforcement
This restraint prevents free contraction
The concrete is therefore pulled back or stretched
Result: TENSILE stress in concrete
In Steel:
Steel prevents the concrete from shrinking freely
The shrinking concrete pulls on the steel, trying to compress it
Result: COMPRESSIVE stress in steel
shrinkage stresses primarily cause tensile stresses in the concrete and compressive stresses in the steel.
A
B...as it's been asked for shrinkage stress...nt fr norml stress..
Options A. Concrete in comparison and steel in tension
A