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GATE 2019 RCC & PSC Day 5 Quiz

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Question 1

As per Indian Standard code of practice for prestressed concrete (IS 1343 - 1980), the minimum grade of concrete to be used for post tensioned and pretensioned structural elements are respectively

Question 2

The profile of the centroid of the tendon is parabolic with a central dip

.Effective prestressing force is

and the span is

. The equivalent upward acting uniform load is

Question 3

A simply supported rectangular concrete beam of span 8m has to be prestressed with a force of 16001(N. 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 l(N/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

Question 4

A pre-stressed concrete rectangular beam of size 300 mm

900 mm is prestressed with an initial prestressing force of 700 kN at an eccentricity of 350mm at mid span. Stress at the top of the beam due to pre-stress alone in N/mm² is

Question 5

In a pre-stressed concrete beam section shown in the figure, the net loss is 10% and the final pre-stressing force applied at X is 750 kN. The initial fiber stresses (in N/mm²) at the bottom of the beam were:

Question 6

A pre-tensioned rectangular concrete beam 150 mm wide and 300 mm depth is prestressed with three straight tendons, each having a cross-sectional area of 50 mm², to initial stress of

. The tendons are located at 100 mm from the soffit of the beam. If the modular ratio is 6, the loss of prestressing force (in kN, up to one decimal place) due to the elastic deformation of concrete only is ______

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ESE & GATE CE Design of Concrete Structures

Sep 16ESE & GATE CE