1
GATE CE 2015 Set 2
MCQ (Single Correct Answer)
+2
-0.6
In a pre-stressed concrete beam section shown in the figure, the net loss is $$10\% $$ and the final prestressing force applied at $$X$$ is $$750$$ $$kN.$$ The initial fiber stresses (in $$N/m{m^2}$$ ) at the top and bottom of the beam were: GATE CE 2015 Set 2 Reinforced Cement Concrete - Prestressed Concrete Question 7 English
A
$$4.166$$ and $$20.833$$
B
$$-4.166$$ and $$-20.833$$
C
$$4.166$$ and $$-20.833$$
D
$$-4.166$$ and $$20.833$$
2
GATE CE 2013
Numerical
+2
-0
A rectangular concrete beam $$250$$ $$mm$$ wide and $$600$$ $$mm$$ deep is pre-stressed by means of $$16$$ high tensile wires, each of $$7$$ $$mm$$ diameter, located at $$200$$ $$mm$$ from the bottom face of the beam at a given section. If the effective pre-stress in the wires is $$700$$ $$MPa,$$ what is the maximum sagging bending moment (in $$kN$$-$$m$$) (correct to $$1$$-decimal place) due to live load that this section of the beam can with stand without causing tensile stress at the bottom face of the beam? Neglect the effect of dead load of beam.
Your input ____
3
GATE CE 2012
MCQ (Single Correct Answer)
+2
-0.6
A concrete beam prestressed with a parabolic tendon is shown in the sketch. The eccentricity of the tendon is measured from the centroid of the cross-section. The applied prestressing force at service is $$1620$$ $$kN.$$ The uniformly distributed load of $$45$$ $$kN/m$$ includes the self-weight. The stress (in $$N/m{m^2}$$) in the bottom fibre at mid-span is GATE CE 2012 Reinforced Cement Concrete - Prestressed Concrete Question 9 English
A
tensile $$2.90$$
B
compressive $$2.90$$
C
tensile $$4.32$$
D
compressive $$4.32$$
4
GATE CE 2009
MCQ (Single Correct Answer)
+2
-0.6
A rectangular concrete beam of width $$120$$ $$mm$$ and depth $$200$$ $$mm$$ is prestressed by pretensioning to a force of $$150$$ $$kN$$ at an eccentricity of $$20$$ $$mm.$$ The cross sectional area of the prestressing steel is $$187.5\,\,m{m^2}.$$ Take modulus of elasticity of steel and concrete as $$2.1 \times {10^5}\,\,MPa$$ and $$3.0 \times {10^4}\,\,MPa$$ respectively. The percentage loss of stress in the prestressing steel due to elastic deformation of concrete is
A
$$8.75$$
B
$$6.125$$
C
$$4.81$$
D
$$2.19$$
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Fluid Mechanics and Hydraulic Machines
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