LOSS OF PRESTRESSING FORCE IN PRESTRESSED COUPLINGS AS A RESULT OF CREEP AND SHRINKAGE

SPANNKRAFTVERLUST AN SPANNGLIEDKOPPLUNGEN INFOLGE KRIECHEN UND SCHWINDEN

CRACKS OBSERVED RECENTLY IN THE JOINTS OF PRESTRESSED CONCRETE BRIDGES HAVE COMPLEX CAUSES. ONE POSSIBLE CAUSE IS THAT THE LOSS IN PRESTRESSING FORCE RESULTING FROM CREEP AND SHRINKAGE IN THE AREA OF THE COUPLING IS CONSIDERABLY GREATER THAN IT IS IN THE AREA OF THE NORMAL PRESTRESSING MEMBER, BECAUSE THE LINKED ANCHOR HAS A LARGER CROSS SECTION AND IS A DIFFERENT SHAPE. THE INTENTION IS TO EXAMINE THIS INFLUENCE BY COMPUTER STUDIES AND TESTS.