1
GATE CE 2009
+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
$$2.19$$
2
GATE CE 2008
+2
-0.6
A pre-tensioned concrete member of section $$200\,\,mm \times 250\,\,mm$$ contains tendons of area $$500\,\,m{m^2}$$ at the centre of gravity of the section. The prestress in tendons is $$1000\,\,N/m{m^2}.$$. Assuming modular ratio as $$10,$$ the stress $$\left( {N/m{m^2}} \right)$$ in concrete is
A
$$11$$
B
$$9$$
C
$$7$$
D
$$5$$
3
GATE CE 2007
+2
-0.6
A concrete beam of rectangular cross-section of size $$120$$ $$mm$$ (width) and $$200$$ $$mm$$ (depth) is prestressed by a straight tendon to an effective force of $$150$$ $$kN$$ at an eccentricity of $$20$$ $$mm$$ (below the centroidal axis in the depth direction). The stresses at the top and bottom fibres of the section are
A
$$2.5\,\,N/m{m^2}\,\,\left( {compression} \right),\,\,10\,N/m{m^2}\,\left( {compression} \right)$$
B
$$10\,\,N/m{m^2}\,\,\left( {tension} \right),\,\,2.5\,N/m{m^2}\,\left( {compression} \right)$$
C
$$3.75\,\,N/m{m^2}\,\,\left( {tension} \right),\,\,2.75\,N/m{m^2}\,\left( {compression} \right)$$
D
$$2.75\,\,N/m{m^2}\,\,\left( {compression} \right),\,\,3.75\,N/m{m^2}\,\left( {compression} \right)$$
4
GATE CE 2005
+2
-0.6
A concrete beam of rectangular cross section of $$200\,\,mm \times 400\,\,mm$$ is pre-stressed with a force $$400$$ $$kN$$ at eccentricity $$100$$ $$mm.$$ the maximum compressive stress in the concrete is
A
$$12.5\,\,N/m{m^2}$$
B
$$7.5\,\,N/m{m^2}$$
C
$$5.0\,\,N/m{m^2}$$
D
$$2.5\,\,N/m{m^2}$$
GATE CE Subjects
Engineering Mechanics
Strength of Materials Or Solid Mechanics
Structural Analysis
Construction Material and Management
Reinforced Cement Concrete
Steel Structures
Geotechnical Engineering
Fluid Mechanics and Hydraulic Machines
Irrigation
Geomatics Engineering Or Surveying
Environmental Engineering
Transportation Engineering
Engineering Mathematics
General Aptitude
EXAM MAP
Joint Entrance Examination