GATE CE Concrete Structures PYQs & Answers — Page 4

Questions 31–40 of 44. Imported answers require independent review unless marked reviewed.

A simply supported prismatic concrete beam of rectangular cross-section, having a span of 8 m, is prestressed with an effective prestressing force of 600 kN. The eccentricity of the prestressing tendon is zero at supports and varies linearly to a value of

at the mid-span. In order to balance an external concentrated load of 12 kN applied at the mid-span, the required value of

(in mm, round off to the nearest integer) of the tendon, is _____.

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In the reinforced beam section shown in the figure (not drawn to scale), the nominal cover provided at the bottom of the beam as per IS 456-2000, is

Diagram for Civil Engineering question 9

Your answerChoose one option.

30 mm

36 mm

42 mm

50 mm

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For a given loading on a rectangular plain concrete beam with an overall depth of 500

, the compressive strain and tensile strain developed at the extreme fibers are of the same magnitude of

. The curvature in the beam cross-section (in

, round off to 3 decimal places), is ________.

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In the context of provisions relating to durability of concrete, consider the following assertions:

Assertion (1): As per IS 456-2000, air entrainment to the extent of 3% to 6% is required for concrete exposed to marine environment.

Assertion (2): The equivalent alkali content (in terms of Na₂O equivalent for a cement containing 1% and 0.6% of Na₂O and K₂O, respectively, is approximately 1.4% (rounded to 1 decimal place).

Which one of the following statements is CORRECT?

Your answerChoose one option.

Assertion (1) is FALSE and Assertion (2) is TRUE

Assertion (1) is TRUE and Assertion (2) is FALSE

Both Assertion (1) and Assertion (2) are FALSE

Both Assertion (1) and Assertion (2) are TRUE

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When a specimen of M25 concrete is loaded to a stress level of 12.5

, a strain of

is recorded. If this load is allowed to stand for a long time, the strain increases to

. In accordance with the provisions of IS:456-2000, considering the long-term effects, the effective modulus of elasticity of the concrete (in

) is __________

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Two rectangular under-reinforced concrete beam sections X and Y are similar in all aspects except that the longitudinal compression reinforcement in section Y is 10% more. Which one of the following is the correct statement?

Your answerChoose one option.

Section X has less flexural strength and is less ductile than section Y

Section X has less flexural strength but is more ductile than section Y

Sections X and Y have equal flexural strength but different ductility

Sections X and Y have equal flexural strength and ductility

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As per IS 456 : 2000, the minimum percentage of tension reinforcement (up to two decimal places) required in reinforced-concrete beams of rectangular cross-section (considering effective depth in the calculation of area) using Fe500 grade steel is _____

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A reinforced-concrete slab with effective depth of 80 mm is simply supported at two opposite ends on 230 mm thick masonry walls. The centre-to-centre distance between the walls is 3.3 m. As per IS 456 : 2000, the effective span of the slab (in m, up to two decimal places) is _____

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A single-reinforced rectangular concrete beam of width 300 mm and effective depth 400 mm is to be designed using M25 grade concrete and Fe500 grade reinforcing steel. For the beam to be under-reinforced, the maximum number of 16 mm diameter reinforcing bar that can be provided is

Your answerChoose one option.

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An RC short column (with lateral ties) of rectangular cross section of 250 mm × 300 mm is reinforced with four numbers of 16 mm diameter longitudinal bars. The grades of steel and concrete are Fe415 and M20, respectively. Neglect eccentricity effect. Considering limit state of collapse in compression (IS 456 : 2000), the axial load carrying capacity of the column (in kN, up to one decimal place) is _____

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GATE CE Concrete Structures PYQs

Question 44

Question 9

Question 19

Question 31

Question 39

Question 9

Question 21

Question 22

Question 31

Question 40