Course detail

Prestressed engineering construction

FAST-CL61Acad. year: 2019/2020

Principle of prestressing. Basic concept of pre-tensioning and post-tensioning. Material properties, manufacturing. Pretensioning operations, technology. Post-tensioning operations, technology, prestressing systems.
Prestressing and its changes. Effects of prestressing on concrete members and structures, statically determinate and indeterminate structures.
Ultimate limit state of prestressed members, full stress-strain response, shear resistance. Resistance of prestressed members against cracks. Control of crack width and deflection of prestressed members.
Design and construction both of building and engineering prestressed structures.
Application of prestressing on masonry structures. Strengthening of masonry structures using prestressing.
Design and construction of general types of slab and girder bridges, bridges built on the stationary and launch scaffolding, cantilever bridges, incrementally launched bridges, precast girder and segmental bridges.

Language of instruction

Czech

Number of ECTS credits

3

Guarantor

prof. RNDr. Ing. Petr Štěpánek, CSc., dr. h. c.

Department

Institute of Concrete and Masonry Structures (BZK)

Learning outcomes of the course unit

A student gains these knowledge and skills:
• Understanding of the behaviour of prestressed concrete structures.
• Design and construction of prestressed concrete structural members and structural systems, analysis and detailing.

Prerequisites

structural mechanics, theory of elasticity, plasticity, concrete and masonry members, concrete and masonry structures

Co-requisites

Not applicable.

Planned learning activities and teaching methods

Not applicable.

Assesment methods and criteria linked to learning outcomes

Not applicable.

Course curriculum

1. Introduction, basic concept of prestressing. Behaviour of non-prestressed and prestressed concrete beams. Material properties of concrete, prestressing tendons and bars, manufacturing.
2. Prestressing technology, basic terminology. Pretensioned concrete. Post-tensioning operations, technology, prestressing systems.
3. Prestressing and its changes. Effects of prestressing on concrete members and structures. Equivalent load method. Design of prestressing using the load balancing method. Influence of the construction metod on design of prestressed structures. Structural analysis of segmentally constructed prestressed structures. Closed form solution of rheological effects on the structures.
4. General principles of prestress members dimensioning. Ultimate limit state (ULS) of prestressed members loaded by axial force and bending moment, decompression state, initial stress-state of the cross-section. Prestressed members loaded in shear and torsion, stress analysis, proportioning.
5. Analysis of the anchorage zone - stress, calculation model, check of resistance, reinforcement. Serviceability limit states (SLS). Limitation of stress, crack resistence, calculation of crack width. Control of deflection.
6. Design and realisation of selected prestressed structures of building constructions.
7. Design and realisation of selected prestressed structures both of building and engineering constructions.
8. Design and realisation of selected prestressed structures of engineering construction.
9.Application of prestressing on masonry structures – structural modifications, posibilities of inserting of prestressing, general principles of structural solution and dimensioning.
10. Strengthening of masonry structures by prestressing – possible methods of strengthening, application of unbonded reinforcement, structural modifications, metods of realisation, structural analysis.
11. Design and construction of general types of slabs and girder bridges.
12. Problems of design and construction of bridges built on the stationary and launch scaffolding, cantilever bridges, incrementally launched bridges.
13. Problems of design and construction of precast girder and segmental bridges.

Work placements

Not applicable.

Aims

Understanding of the behaviour of prestressed concrete structures.
Design and construction of prestressed concrete structural members and structural systems, analysis and detailing.

Specification of controlled education, way of implementation and compensation for absences

Extent and forms are specified by guarantor’s regulation updated for every academic year.

Recommended optional programme components

Not applicable.

Prerequisites and corequisites

Not applicable.

Basic literature

COLLINS, Michael P. a MITCHELL, Denis: Prestressed Concrete Structures. New Jersey: Prentice Hall, 1991. ISBN 0-13-691635-X. (EN)
NAVRÁTIL, Jaroslav: Prestressed Concrete Structures. Brno: CERM, 2006. ISBN 80-7204-462-1. (EN)
ROMBACH, Günter: Spannbetonbau. Berlin: Ernst und Sohn, 2010. ISBN 978-3-433-02911-4. (DE)

Recommended reading

GERWICK, Ben C.: Construction of Prestressed Concrete Structures. USA: John Wiley and Sons, 1997. ISBN 978-0-471-18113-2. (EN)
Stráský, Jiří: Betonové mosty. Praha: ČSSI, 2001. ISBN 80-86426-05-X. (CS)
NAVRÁTIL, Jaroslav a ZICH, Miloš: Předpjatý beton (průvodce předmětem v elektronické podobě). Brno: VUT, 2006. (CS)
NAVRÁTIL, Jaroslav: Předpjaté betonové konstrukce. Brno: CERM, 2008. ISBN 978-80-7204-561-7. (CS)
NAVRÁTIL, Jaroslav, ŠTĚPÁNEK, Petr a STRÁSKÝ, Jiří: Předpjaté stavební konstrukce (studijní opora v elektronické podobě). Brno: VUT, 2009. (CS)
BAŽANT, Zdeněk a KLUSÁČEK, Ladislav: Statika při rekonstrukcích objektů. Brno: CERM, 2010. ISBN 978-80-7204-692-8. (CS)
PROCHÁZKA, Jaroslav a kol.: Navrhování betonových konstrukcí podle norem ČSN EN 1992 (EUROKÓDU 2). Část 2: Předpjatý beton. Praha: ČBS Servis, 2010. ISBN 978-80-87158-21-0. (CS)

Type of course unit

 

Lecture

26 hours, optionally

Teacher / Lecturer

prof. RNDr. Ing. Petr Štěpánek, CSc., dr. h. c.

Syllabus

1. Introduction, basic concept of prestressing. Behaviour of non-prestressed and prestressed concrete beams. Material properties of concrete, prestressing tendons and bars, manufacturing. 2. Prestressing technology, basic terminology. Pretensioned concrete. Post-tensioning operations, technology, prestressing systems. 3. Prestressing and its changes. Effects of prestressing on concrete members and structures. Equivalent load method. Design of prestressing using the load balancing method. Influence of the construction metod on design of prestressed structures. Structural analysis of segmentally constructed prestressed structures. Closed form solution of rheological effects on the structures. 4. General principles of prestress members dimensioning. Ultimate limit state (ULS) of prestressed members loaded by axial force and bending moment, decompression state, initial stress-state of the cross-section. Prestressed members loaded in shear and torsion, stress analysis, proportioning. 5. Analysis of the anchorage zone - stress, calculation model, check of resistance, reinforcement. Serviceability limit states (SLS). Limitation of stress, crack resistence, calculation of crack width. Control of deflection. 6. Design and realisation of selected prestressed structures of building constructions. 7. Design and realisation of selected prestressed structures both of building and engineering constructions. 8. Design and realisation of selected prestressed structures of engineering construction. 9.Application of prestressing on masonry structures – structural modifications, posibilities of inserting of prestressing, general principles of structural solution and dimensioning. 10. Strengthening of masonry structures by prestressing – possible methods of strengthening, application of unbonded reinforcement, structural modifications, metods of realisation, structural analysis. 11. Design and construction of general types of slabs and girder bridges. 12. Problems of design and construction of bridges built on the stationary and launch scaffolding, cantilever bridges, incrementally launched bridges. 13. Problems of design and construction of precast girder and segmental bridges.

Exercise

13 hours, compulsory

Teacher / Lecturer

prof. RNDr. Ing. Petr Štěpánek, CSc., dr. h. c.

Syllabus

1. Effect of prestressing on statically determinate structures. Students are to solved tasks individually. 2. Effect of prestressing on statically indeterminate structures. Students are to solved tasks individually. 3.- 4. Project: Design and assessment of prestressed roof girder. Action and combination of loads, design of cross-section, characteristics of materials, types of prestressing steels, structural requirements. 5.– 6. Continuation of project. Design of eccentricity and magnitude of prestressing force, design of amount of prestressed strands. 7. Continuation of project. Immediate (short-term) losses of prestress. 8. Continuation of project. Long-term (time dependent) losses of prestress. 9.– 10. Continuation of project. Verification of design by serviceability limit state – stress limitation, crack control. 11. Continuation of project. Verification of design by ultimate limit state – bending moment. 12. Continuation of project. Scheme of girder reinforcement by prestressing strands. 13. Project and tasks submission. Credit.