Day 30-Oct 18-Worksheet-PWD AE-PSC,retaining wall & water tank

In the load balancing method of prestressed concrete, the shape of the cable is determined based on —

• Shear force diagram

• Moment–curvature relationship

• Bending moment diagram

• Stress–strain curve

A beam of cross-section 200 mm × 400 mm is prestressed with 400 kN force at 100 mm eccentricity. The maximum compressive stress in concrete is —

(a)  

For M40 concrete in a water tank designed by WSM, the permissible bending tension in serviceability limit is —

• 2.0 N/mm²

• 2.4 N/mm²

• 2.6 N/mm²

• 2.8 N/mm²

The resultant earth pressure on a retaining wall acts at a height of —

• h/2 from base

• h/4 from base

• h/3 from base

• h/3 from top

A counterfort retaining wall is preferred when the retained height exceeds —

• 2 m

• 4 m

• 6 m

• 9 m

The minimum grade of concrete for pretensioned prestressed concrete is (a)   .

The percentage loss of prestress is given by = (a)   .

In pretensioned beams, the major immediate loss of prestress is due to (a)   .

For a water tank, the minimum nominal cover shall not be less than (a)   mm.

The factor of safety against overturning for retaining wall under (DL + LL + EP) combination is (a)   .