WorksheetsDay 105-Jan 14-worksheet-Btech-Prestressed concrete 1
Total questions: 15
Worksheet time: 11mins
Load balancing method in prestressed concrete is mainly suitable for:
Straight cable profile
Curved cable profile
Vertical tendons only
Cantilever beams only
In load balancing method, the shape of the cable profile is decided based on:
Shear force diagram
Deflected shape
Bending moment diagram
Span–depth ratio
In a parabolic cable with zero eccentricity at supports, the equivalent upward load is given by:
q=L4Pe
q=L22Pe
q=L28Pcosθe
q=ZPe
The profile equation of a parabolic cable carrying UDL is:
y=Lx2
y=L24ex(L−x)
y=xeL
y=ex2
In prestressed concrete, tendons are commonly made of:
Mild steel only
Aluminium alloys
High tensile steel
Cast iron
In prestressed concrete, internal compressive stresses are introduced to counteract external tensile stresses.
True
False
In post-tensioning, prestress is transferred to concrete mainly by bond.
True
False
Prestressed concrete is used mainly because concrete is weak in (a) .
In load balancing method, prestressing force balances the ________ load.
applied
dead only
live only
thermal
For a parabolic cable, eccentricity is maximum at the (a) .
The stress produced due to prestressing force acting concentrically is (a) stress.
In pre-tensioning, prestress is transferred to concrete by (a) .
In post-tensioning, prestress transfer is achieved by (a) devices.
A prestressed beam has a parabolic tendon with zero eccentricity at supports. Span = 8 m, prestressing force = 1500 kN, eccentricity at midspan = 200 mm. The equivalent uniformly distributed upward load is:
(a)
A prestressed concrete beam of size 200 mm × 400 mm is prestressed with a force of 400 kN at eccentricity 100 mm. The maximum compressive stress developed is:
(a)
