TY - JOUR A1 - Mietz, Jürgen A1 - Fischer, Joachim T1 - Verifizierung zerstörungsfreier Prüfverfahren zur Detektion von Spannstahlschäden an Spannbetonbauteilen mit nachträglichem Verbund T2 - Beton- und Stahlbetonbau N2 - For an assessment of the risk potential of existing structures where in the case of prestressing steel damage the load-bearing capacity could be significantly affected non-destructive testing techniques which enable reliable evaluation of the condition of the prestressing steels are of utmost importance. During the demolition of the Hohenzollerndamm bridge in Berlin where damage of prestressing wires due to hydrogen-induced stress corrosion cracking were found in former investigations parts of the girders of the bridge superstructure could be taken out. After non-destructive investigation by means of two testing techniques based on magnetic leakage flux measurement and one technique based on electromagnetic resonance measurement the single wires were inspected in order to verify the non-destructive testing results with respect to their reliability. From the results it can be concluded that areas with fractures of several wires could be detected by the two techniques based on magnetic leakage flux measurement. PB - Ernst CY - Berlin PY - 2005 UR - https://opus4.kobv.de/opus4-bam/frontdoor/index/index/docId/11148 AN - OPUS4-11148 SN - 0005-9900 SN - 1437-1006 VL - 100 IS - 8 SP - 656 EP - 663 AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany