STUDY OF THE PUNCHING OF LIGHTWEIGHT NON-REINFORCED CONCRETE

ETUDE DU POINCONNEMENT DU BETON LEGER NON ARME

THE BEHAVIOUR OF LIGHTWEIGHT CONCRETE UNDER CONCENTRATED LOAD IS LITTLE KNOWN, AND THE PROBLEM ARISES FAIRLY FREQUENTLY IN CIVIL ENGINEERING. THIS RESEARCH DEALS WITH TWO ASPECTS; (1) EFFECT OF ECCENTRICITY. AXIAL PUNCHING TESTS PERFORMED TO HELP DEFINE THE REGULATIONS GOVERNING LIGHTWEIGHT CONCRETE HAVE SHOWN A NUMBER OF DIFFERENCES FROM THE PRESENT ASSERTIONS WHEN ROTATIONAL SYMMETRY IS NOT PRESENT ANYMORE. IT IS PROPOSED TO COMPLETE THE TESTS ALREADY CARRIED OUT WITH ECCENTRIC LOADING TESTS WITH A VIEW TO OBTAINING DATA ON THIS PARAMETER AND ITS INFLUENCE ON STRENGTH. (2) EFFECT OF A GROOVE IN THE LOAD AXIS: THE AIM OF THIS STUDY IS TO MAKE A SPECIAL INVESTIGATION IN THE CASE OF POST-TENSIONED ANCHORAGE SYSTEMS. IT IS ENVISAGED TO EXAMINE HOW THE RESULTS OF PUNCHING CAN BE DIRECTLY APPLIED, AS, IN REAL CASES, THERE IS ALWAYS A GROOVE (DUCT) IN THE ANCHORAGE AXIS TO ALLOW THE CABLE TO GO THROUGH.