Diagonal tension in a beam
A. Is maximum at neutral axis
B. Decreases below the neutral axis and increases above the neutral axis
C. Increases below the neutral axis and decreases above the neutral axis
D. Remains same
Answer: Option C
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
Below N.A shear stress is more (rectangular) while above N.A shear stress decreases parabolically .
More shear stress means more more diagonal tension .
at the neutral axis
Shear analysis and design are NOT really concerned with shear as such.The real concern is with diagonal tension stress ; resulting from the combination of shear stress and longitudinal flexural stress.νmax = V/bd must be regarded merely as a measure of the average intensity of shear stresses in the section. The max. shear stress occurs at neutral axis with an angle of 45° Webs hear crack Flexural crack.
Web-shear crack occurs when the diagonal tension stress near the neutral axis becomes equal to the tensile strength of the concrete. Web shear cracking is relatively rare and occurs chiefly near supports of deep, thin webbed beam or at inflection points of continuous beam.
Please explain dugonal axis maximum at below the neutral axis
Explain why diagonal tension increases below the neutral axis