Course Details

Concrete Structures (S)

NLA022 course is part of 3 study plans

Ing. full-t. program NPC-SIS compulsory Winter Semester 1st year 5 credits

Ing. full-t. program NPA-SIS compulsory Winter Semester 1st year 5 credits

Ing. combi. program NKC-SIS compulsory Winter Semester 1st year 5 credits

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. Design of concrete structures exposed to fire. Methods and static analysis of strengthening of concrete and masonry structures.

Course Guarantor

doc. Ing. Ivana Laníková, Ph.D.

Institute

Institute of Concrete and Masonry Structures

Learning outcomes

A student acquires the following knowledge and skills:
Understanding of the behavior of prestressed concrete structures. Knowledge of pre-tensioning technology and post-tensioning technology. Design of prestressed concrete structural members and structural systems, analysis and detailing. Knowledge of design of concrete structures exposed to fire. Understanding of the static approach to the renovation of building and engineering structures.

Prerequisites

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

Corequisites

are not required

Planned educational activities and teaching methods

Teaching methods depend on the type of course unit as specified in the article 7 of BUT Rules for Studies and Examinations. Education runs in the forms of lectures and trainings. Character of the lectures is based on definition of basic principles, rules and methodology. The main subject matters are trained on individually defined projects (examples) during the practices.

Forms and criteria of assessment

The students should elaborate individually defined design and calculate specified task to gain the credit. The students are obliged to consult the design continuously in the given terms and submit it to the fixed date. The student presence in training lessons is checked and mandatory. An exam is held in written form and consists both of the practical part, in which the task is elaborated, and the theoretical part. Both parts should be accomplished to pass the exam.

Objective

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

Specification of controlled instruction, the form of instruction, and the form of compensation of the absences

Vymezení kontrolované výuky a způsob jejího provádění stanoví každoročně aktualizovaná vyhláška garanta předmětu.

Lecture

2 hours/week, 13 weeks, elective

Syllabus of lectures

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. Design of concrete structures exposed to fire. The effect of the fire to the structure. Determination of fire resistance.
10.–11. The behaviour of materials during effects of fire. Design approaches. Simplified computational methods.
12. Principles of structural approach to the reconstruction of concrete and masonry structures and foundations, methods of strengthening.
13. Strengthening of concrete and masonry structures by prestressing – methods of strengthening, realisation, structural analysis.

Practice

2 hours/week, 13 weeks, compulsory

Syllabus of practice

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 prestressing. Long-term (time dependent) losses of prestressing.
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.