Course detail

Concrete structures (S)

FAST-CL001Acad. year: 2022/2023

Principle of prestressing. Basic concept of pretensioning and post-tensioning. Material properties. Pretensioning operations, technology. Post-tensioning operations, technology. Losses of prestressing. Equivalent load method, statically determinate and indeterminate structures. Response of structures subjected to prestressing, decompression state. Resistance of against cracks. Tensile stresses in the concrete after cracking. Control of crack width and deflection. Ultimate limit state, full stress-strain response, shear resistance. Design of prestressed concrete structural members and structural systems, analysis and detailing. Methods and static analysis of strengthening of concrete and masonry structures. Design of concrete structures exposed to fire.

Language of instruction

Czech

Number of ECTS credits

Mode of study

Not applicable.

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 of prestressed concrete structural members and structural systems, analysis and detailing.

Prerequisites

structural mechanics, theory of elasticity, plasticity, design of concrete members, design of 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, manufacturing.
2. Prestressing technology, basic terminology. Pre- and post-tensioning prestressed concrete, prestressing systems.
3. Prestressing and its changes.
4. 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.
5. 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.
6. 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.
7.- 8. Design and realisation of selected prestressed structures of building and engineering constructions.
9. Principles of structural approach to the reconstruction of concrete and masonry structures and foundations, methods of strengthening.
10. Strengthening of concrete and masonry structures by prestressing – methods of strengthening, realisation, structural analysis.
11. Design of concrete structures exposed to fire. The effect of the fire to the structure. Determination of fire resistance.
12.- 13. The behaviour of materials during effects of fire. Design approaches. Simplified computational methods.

Work placements

Not applicable.

Aims

Understanding of the behaviour of prestressed concrete structures. Design 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

BAŽANT, Zdeněk a KLUSÁČEK, Ladislav. Statika při rekonstrukcích objektů. Brno: CERM, 2010. ISBN 978-80-7204-692-8. (CS)
COLLINS, Michael P. a MITCHELL, Denis. Prestressed Concrete Structures. New Jersey: Prentice Hall, 1991. ISBN 0-13-691635-X. (EN)
NAVRÁTIL, Jaroslav. Předpjaté betonové konstrukce. Brno: CERM, 2008. ISBN 978-80-7204-561-7. (CS)
PROCHÁZKA, Jaroslav, ŠTEFAN, Radek a VAŠKOVÁ, Jitka. Navrhování betonových a zděných konstrukcí na účinky požáru. Praha: ČVUT, 2010. ISBN 978-80-01-04613-5. (CS)

Recommended reading

Elektronické studijní opory FAST VUTNavrátil Jaroslav, Zich Miloš. Předpjatý beton - průvodce. 68 stran, 2007 (CS)
GERWICK, Ben C. Construction of Prestressed Concrete Structures. USA: John Wiley and Sons, 1997. ISBN 978-0-471-18113-2. (EN)
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)

Classification of course in study plans

  • Programme N-P-C-SI Master's

    branch S , 1 year of study, winter semester, compulsory
    branch S , 1 year of study, winter semester, compulsory
    branch S , 1 year of study, winter semester, compulsory

  • Programme N-K-C-SI Master's

    branch S , 1 year of study, winter semester, compulsory
    branch S , 1 year of study, winter semester, compulsory
    branch S , 1 year of study, winter semester, compulsory

  • Programme N-P-E-SI Master's

    branch S , 1 year of study, winter semester, compulsory
    branch S , 1 year of study, winter semester, compulsory
    branch S , 1 year of study, winter semester, compulsory

Type of course unit

 

Lecture

26 hod., 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, manufacturing. 2. Prestressing technology, basic terminology. Pre- and post-tensioning prestressed concrete, prestressing systems. 3. Prestressing and its changes. 4. 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. 5. 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. 6. 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. 7.- 8. Design and realisation of selected prestressed structures of building and engineering constructions. 9. Principles of structural approach to the reconstruction of concrete and masonry structures and foundations, methods of strengthening. 10. Strengthening of concrete and masonry structures by prestressing – methods of strengthening, realisation, structural analysis. 11. Design of concrete structures exposed to fire. The effect of the fire to the structure. Determination of fire resistance. 12.- 13. The behaviour of materials during effects of fire. Design approaches. Simplified computational methods.

Exercise

26 hod., 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. 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. 3.– 4. Continuation of project. Design of eccentricity and magnitude of prestressing force, design of amount of prestressed strands. 5.- 6. Continuation of project. Immediate (short-term) losses of prestress. Long-term (time dependent) losses of prestress. 7. Continuation of project. Verification of design by serviceability limit state – stress limitation, crack control. 8.- 9. Continuation of project. Verification of design by ultimate limit state – bending moment. 10. Continuation of project. Scheme of girder reinforcement by prestressing strands. 11.- 12. Design of concrete structures exposed to fire. 13. Project and tasks submission. Credit.