GATE CE Concrete Structures PYQs & Answers — Page 2

Questions 11–20 of 44. Imported answers require independent review unless marked reviewed.

An inverted T-shaped concrete beam (B1) in the figure, with centroidal axis X – X, is subjected to an effective prestressing force of 1000 kN acting at the bottom kern point of the beam cross-section. Also consider an identical concrete beam (B2) with the same grade of concrete but without any prestressing force.

Diagram for Civil Engineering question 50

The additional cracking moment (in kN.m) that can be carried by beam B1 in comparison to beam B2 is __________ (rounded off to the nearest integer).

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A concrete column section of size 300 mm × 500 mm as shown in the figure is subjected to both axial compression and bending along the major axis. The depth of the neutral axis (

) is 1.1 times the depth of the column, as shown.

Diagram for Civil Engineering question 51

The maximum compressive strain (

) at highly compressive extreme fiber in concrete, where there is no tension in the section, is ________×

(rounded off to 2 decimal places).

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A slab panel with an effective depth of 250 mm is reinforced with 0.2% main reinforcement using 8 mm diameter steel bars. The uniform center-to-center spacing (in mm) at which the 8 mm diameter bars are placed in the slab panel is __________ (rounded off to the nearest integer).

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Creep of concrete under compression is defined as the ________.

Your answerChoose one option.

increase in the magnitude of strain under constant stress

increase in the magnitude of stress under constant strain

decrease in the magnitude of strain under constant stress

decrease in the magnitude of stress under constant strain

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A singly reinforced concrete beam of balanced section is made of M20 grade concrete and Fe415 grade steel bars. The magnitudes of the maximum compressive strain in concrete and the tensile strain in the steel at the ultimate state under flexure, as per IS 456: 2000 are ________, respectively. (round off to four decimal places)

Your answerChoose one option.

0.0035 and 0.0038

0.0020 and 0.0018

0.0035 and 0.0041

0.0020 and 0.0031

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M20 concrete as per IS 456: 2000 refers to concrete with a design mix having ________________

Your answerChoose one option.

an average cube strength of 20 MPa

an average cylinder strength of 20 MPa

a 5-percentile cube strength of 20 MPa

a 5-percentile cylinder strength of 20 MPa

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With regard to the shear design of RCC beams, which of the following statements is/are TRUE?

Your answerSelect all correct options. You can choose more than one.

Excessive shear reinforcement can lead to compression failure in concrete

Beams without shear reinforcement, even if adequately designed for flexure, can have brittle failure

The main (longitudinal) reinforcement plays no role in the shear resistance of beam

As per IS456:2000, the nominal shear stress in the beams of varying depth depends on both the design shear force as well as the design bending moment

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Consider a doubly reinforced RCC beam with the option of using either Fe250 plain bars or Fe500 deformed bars in the compression zone. The modulus of elasticity of steel is

N/mm

. As per IS456:2000, in which type(s) of the bars, the stress in the compression steel (

) can reach the design strength (

) at the limit state of collapse?

Your answerChoose one option.

Fe250 plain bars only

Fe500 deformed bars only

Both Fe250 plain bars and Fe500 deformed bars

Neither Fe250 plain bars nor Fe500 deformed bars

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Consider the singly reinforced section of a cantilever concrete beam under bending, as shown in the figure (M25 grade concrete, Fe415 grade steel). The stress block parameters for the section at the ultimate limit state, as per IS 456: 2000 notations, are given. The ultimate moment of resistance for the section by the Limit State Method is __________ kN.m (round off to one decimal place).

[Note: Here,

is the total area of tension steel bars,

is the width of the section,

is the effective depth of the bars,

is the characteristic compressive cube strength of concrete,

is the yield stress of steel, and

is the depth of neutral axis.]

Diagram for Civil Engineering question 55

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In the context of elastic theory of reinforced concrete, the modular ratio is defined as the ratio of

Your answerChoose one option.

Young’s modulus of elasticity of reinforcement material to Young’s modulus of elasticity of concrete.

Young’s modulus of elasticity of concrete to Young’s modulus of elasticity of reinforcement material.

shear modulus of reinforcement material to the shear modulus of concrete.

Young’s modulus of elasticity of reinforcement material to the shear modulus of concrete.

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GATE CE Concrete Structures PYQs

Question 50

Question 51

Question 52

Question 13

Question 14

Question 15

Question 27

Question 37

Question 55

Question 14