Concrete-structures Questions Set 22:
What will be the effect on bond of concrete with increase in diameter of bar?
Solution:
What is the effect of nature of force in the bar on frictional resistance in concrete
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The thickened part of a flat slab over its supporting column is technically known as a _____.
Solution:
In one way slab the relationship between long span and short span is
Solution:
According to IS 456 : 2000, the minimum and maximum percentage of longitudinal reinforcement in a column (expressed as percentage of gross cross-sectional area of the column), are respectively
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Determine the ultimate moment of resistance of a doubly reinforced section of 300×550 mm having an area of tension reinforcement as 3054 mm² and compression reinforcement as 982 mm². Use M20 and Fe415 grades. The effective cover is 50 mm.
Solution:
A prestressed concrete beam has a cross-section with the following properties: Area (A)=46400 mm², I-75.8x107 mm. Y at bottom 244 mm, Y at top=156 mm
It is subjected to a prestressing force at an eccentricity e so as to have a zero stress at the top
fibre. The value of e is given by
Solution:
The critical bending compressive stress in the extreme fiber of a structural steel section is 1000 MPa. The yield strength of the steel is 250 MPa, the width of the flange is 250 mm, and the thickness of the flange is 15 mm. According to the provisions of IS: 800-2007, the non-dimensional slenderness ratio of the steel cross-section is:
Solution:
When a specimen of M25 concrete is loaded to a stress level of 12.5 MPa, a strain of 500x10-6 is recorded. If this load is allowed to stand for a long time, the strain increases to 1000 x 10-6. In accordance with the provisions of IS:456-2000, considering the long-term effects, the effective modulus of elasticity of the concrete (rounded off to nearest integer, in MPa) is ______.
Solution:
A simply supported rectangular concrete beam of span 8 m has to be prestressed with a force of 1600 kN. The tendon is of parabolic profile having zero eccentricity at the supports. The beam has to carry an external uniformly distributed load of intensity 30 kN/m. Neglecting the self-weight of the beam, the maximum dip (in meters, up to two decimal places) of the tendon at the mid-span to balance the external load should be _____.
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