Gujarat Technological UniversitySummer 2026 examination

GTU 3170624 Design of Prestressed Concrete structures Summer 2026 Question Paper & PDF

B.E. · Civil Engineering · Semester 7 · Subject code 3170624
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Total
70 marks
To pass
23 marks (33%)
Duration
2.5 Hours 2:30 PM – 5:00 PM
Questions
5 with internal choice
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Q.1

14 Marks
(a)
3 marks
Explain the terms:
1)Pretensioning
2)Tendon
3)Anchorage
(b)
4 marks
List the various types of tensioning device used in prestressed concrete.
(c)
7 marks

A prestressed rectangular concrete bam 200 mm wide and 600 mm deep is supporting a live load of 8kN/m over a span of 8 m. Find the effective prestressing force in the parabolic cable having an eccentricity of 80 mm at the center of span and concentric at the supports. Case

1)In this beam the bending effect of the prestressing force is nullified by the imposed load for the mid span section, neglecting self weight of the beam. Case
2)if the resultant force due to self weight, LL and prestressing force is zero at the soffit of the beam at the center of span section.

Q.2

14 Marks
(a)
3 marks
Explain
1)Bonded Prestressed Concrete
2)Post-tensioning
3)Degree of Prestressing.
(b)
4 marks
Explain the concept of thrust line in PSC sections
(c)
7 marks

Distinguish between web shear, flexural and flexure-shear cracks in concrete beam with sketches.

(c)
7 marks

Explain stress distribution in the end block in the prestressed concrete beam.

Q.3

14 Marks
(a)
3 marks
Explain the differences of prestressed concrete over reinforced concrete.
(b)
4 marks

Explain difference between time dependent and immediate losses in prestressed concrete sections.

(c)
7 marks

A concrete beam of rectangular section 100 mm wide and 300 mm deep is prestressed by 5 wires of 7 mm diameter located at an eccentricity of 50 mm. Initial stress in the wires are 1200 MPa. Estimate the loss of stress in steel due to creep of concrete using IS code method.

(a)
3 marks

Enlist the advantages of composite construction with prestressed and in situ concrete for structural members.

(b)
4 marks

Under what situations and types of structures would you recommended the use of unbounded tendons?

(c)
7 marks

How do you compute the loss of stress due to elastic deformation of concrete in post tensioned members with several cables which are successively tensioned? Explain in detail.

Q.4

14 Marks
(a)
3 marks

Post tensioned members do not suffer the loss of prestress due to elastic deformation why?

(b)
4 marks

Enlist the formula for calculation of Moment of resistance of Flanged sections as per IS 1343 recommendations.

(c)
7 marks

Explain the method of computing bursting tension in an end block subjected to evenly distributed forces.

(a)
3 marks

What is the need for the use of high strength concrete and tensile steel in prestressed concrete?

(b)
4 marks

Define transmission length and what is expression of it as per IS 1343 recommendations.

(c)
7 marks

A Pretensioned prestressed concrete beam of rectangular section 150 mm wide and 350 mm deep has effective cover of 50 mm. If fck = 40MPa, fp = 1600 MPa and Ap = 461 mm², Calculate ultimate flexural strength using IS code provisions.

Q.5

14 Marks
(a)
3 marks
Define the losses present in post-tensioned member.
(b)
4 marks

State the assumptions made in the design of prestressed concrete members for the limit state of collapse in flexure.

(c)
7 marks

A Pretensioned T section has a flange which is 300 mm wide and 200 mm thick. The rib is 150 mm wide by 350 mm deep. The effective depth of cross section is 500 mm. Ap = 200 mm², fck = 50 MPa and fp = 1600 MPa. Estimate ultimate moment capacity of the T section using IS code method.

(a)
3 marks
Explain drying shrinkage strain and autogenous shrinkage strain.
(b)
4 marks

State the four fundamental conditions for stresses at transfer and service stage.

(c)
7 marks

What is the effect of torsion on prestressed concrete sections? How do you compute the shear stressed developed in different types of cross sections due to torque?

Other Semester 7 subjects

BE Civil

2170607
Design of Reinforced Concrete Structures
2170609
Irrigation Engineering
2170610
Professional Practices and Valuation
2170613
Traffic Engineering

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Official Gujarat Technological University (GTU) examination paper for Design of Prestressed Concrete structures (Summer 2026, B.E. · Civil Engineering, Sem 7). Features complete 70-mark regular & remedial examination pattern, official marking distribution across all 5 questions, and direct 1-click official PDF download.

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