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WorksheetsDay 30-Oct 18-Worksheet-PWD AE-PSC,retaining wall & water tank
Total questions: 15
Worksheet time: 10mins
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) .
In a gravity retaining wall, the resultant of all forces must fall within (a) of base width to avoid tension.
In a PSC beam, if the eccentricity is zero, the stress distribution is symmetrical about the centroidal axis.
A simply supported PSC beam (8 m span) has a parabolic tendon e = 100 mm at mid-span, P = 500 kN.
The load balanced w = ? (kN/m).
(a)
When two wires are stretched sequentially in post-tensioning, the maximum elastic loss occurs —
in the wire stretched first
in the last stretched wire
Same in all wires
independent of sequence
A 150 × 300 mm rectangular beam is prestressed concentrically by P = 300 kN.
If service BM = 30 kNm and Z = 3.375 × 10⁶ mm³, the minimum bottom stress is approximately —
(a)
