STUDY OF THE DISTRIBUTION OF PRESTRESSING UNDER ANCHORAGE (NORMAL AND LIGHTWEIGHT CONCRETE)

ETUDE DE LA DIFFUSION DE LA PRECONTRAINTE SOUS ANCRAGE (BETON NORMAL ET BETON LEGER)

THE AIM OF THE RESEARCH IS TO STUDY FISSURATION PHENOMENA WHICH, IN STRUCTURES COMPOSED OF SEGMENTS SUCCESSIVELY CAST IN-SITU, OCCUR ALONG PRESTRESSING CABLES IN THE VICINITY OF THE ANCHORAGE AND WHICH RESULT IN THE DISTRIBUTION OF THE ANCHORAGE FORCE IN YOUNG CONCRETE. TWO TYPES OF CRACK ARE GENERALLY OBSERVED: - CRACK FOLLOWING THE CABLE AXIS AND APPEARING AT A CERTAIN DISTANCE IN FRONT OF THE ANCHORAGE. IT GENERALLY REMAINS FINE IF THE PRESTRESSED ELEMENT CONTAINS SUFFICIENT TRANSVERSE REINFORCEMENT; - CRACKS RADIATING IN FRONT OF THE ANCHORAGE, WHICH CAN SOMETIMES BE OPEN.