هياكل

Teaching objectives:  This course provides students with the necessary knowledge for studying pre-stressed concrete beams through pre-tension and post-tension techniques.

Recommended prior knowledge:  Mathematics, RDM, MDC and reinforced concrete.

Content of the course: 

Chapter 1: General information on prestressed concrete (1 week)

History, Introduction, Principle of prestressing, Advantages and disadvantages of prestressing.

Chapter 2: Materials and equipment used in prestressed concrete (1 week)

Cement, Concrete, Prestressing reinforcement, Passive reinforcement.

Chapter 3: Types of prestressing (2 weeks)

Prestressing by pre-tensioning, Prestressing by post-tensioning, Other techniques.

Chapter 4: Prestressing losses (3 weeks)

Instantaneous and delayed post-tensioning prestressing losses, Pre-tensioning tension losses, Instantaneous and delayed losses, Characteristic values of prestressing reinforcement tensions.

Chapter 5: Bending of isostatic beams (3 weeks)

Generalities, Resistant cross-sections, Actions and loads, Verification classes, ELS bending calculation, Important concepts, Calculation of class I and II cross-sections, Calculation of class III cross-sections, ELU bending calculation, Equilibrium of an ELU cross-section, Characterisation of an ultimate limit state, Principle of justification, Problem equation, Other ultimate limit states.

Chapter 6: Continuous beams on simple supports: (2 weeks)

Calculation of hyperstatic prestressing loads using the internal method, Calculation of prestressing loads using the direct method. 

Chapter 7: Tangent Stress Resistance (2 weeks)

Shear force resistance, Effects of shear force, Reduction of shear force, Calculation of shear stress, Verification of shear force at ELS and ELU, Resistance to torsion, Important concepts, Behaviour of a beam in B.A or B.P. with respect to torsion, Verification of torsion at ELS and ELU.

Chapter 8: Justification of particular cross-sections (1 week)

Introduction, Support zone, Post-tensioning prestressing introduction zone, Pre-tensioning prestressing introduction zone.

Assessment method:  Continuous assessment: 40%; Examination: 60%.

References:

1.      Cours pratique de béton précontraint par G.DREUX.

2.      Construction en béton précontraint par Y.GUYON.

3.      Le béton précontraint aux état limite par H.THONIER.

4.      Cours de béton précontraint par J.FAUCHET.

5.      La précontrainte par Albert CHAUSSIN et R. LA CROIX.