TY - CONF A1 - Küttenbaum, Stefan A1 - Braml, T. A1 - Maack, Stefan T1 - Refining stochastic models for the reassessment of bridges using NDT-methods N2 - Increasing requirements on the infrastructure caused by more and heavier traffic coincide with both the aging and the progressive degradation of bridge constructions. These exemplary issues lead to a non-negligible need for reassessments of existing bridges. Compared to the new building design, safety reserves can be used in the evaluation of such existing structures, since uncertainties that may arise during the design, construction and previous Service time are better known or no longer present. Uncertainties can be evaiuated more precisely by measurements. In the meantime, the application of advanced NDT-methods on concrete structures have become so capable, that crucial structure Parameters like certain material properties or geometrical dimensions can be quantified without significant destructive interventions. The measured data can be explicitly incorporated into the probabilistic computation models used for the bridge reassessment in form of random variables. Therewith, a previously insufficient model can be refined to achieve a higher level of approximation. This contribution emphasises two fundamental steps of the measured data based probabilistic reassessment: The sensitivity analyses to identify the cruciai Parameters and the needed accuracy of the related information as well as the comparison with expected uncertainties of non-destructively measured Parameters. T2 - 17th International Probabilistic Workshop CY - Edinburgh, UK DA - 11.09.2019 KW - Measurement KW - Reassessment KW - Structural safety KW - Concrete bridges KW - NDT PY - 2019 AN - OPUS4-48999 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Küttenbaum, Stefan A1 - Maack, Stefan A1 - Taffe, A. A1 - Braml, T. T1 - Non-destructive testing in civil engineering: A valuable source of information for reliability assessments T2 - IABSE SYMPOSIUM GUIMARÃES 2019. Towards a Resilient Built Environment — Risk and Asset Management N2 - The reassessment of bridges is becoming increasingly important. The basic requirement for analyses of structural safety is reliable knowledge about individual structures. This paper introduces the new approach to evaluate the quality of measured data gained from non-destructive testing (NDT) to provide reliable, objective, and relevant information about existing bridges. The purpose is to relate this validated knowledge to probabilistic analyses. Bridging the gap between NDT and numerical reassessments indicates reduced numerical uncertainties and residual service time extensions. This paper deals with an application of this approach using measurement data collected by ultrasonic technique at a prestressed concrete bridge. T2 - IABSE Symposium 2019 CY - Guimarães, Portugal DA - 27.03.2019 KW - NDT KW - Measurement KW - Structural safety KW - Uncertainty KW - Existing bridges PY - 2019 SN - 978-3-85748-163-5 VL - 112 SP - 1132 EP - 1139 PB - IABSE (International Association for Bridge and Structural Engineering) CY - Zurich, Switzerland AN - OPUS4-47815 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Küttenbaum, Stefan A1 - Taffe, A. A1 - Braml, T. A1 - Maack, Stefan T1 - Non-Destructive Testing: A valuable source of information for reliability assessments N2 - The reassessment of bridges is becoming increasingly important. The basic requirement for analyses of structural safety is reliable knowledge about individual structures. This paper introduces the new approach to evaluate the quality of measured data gained from non-destructive testing (NDT) to provide reliable, objective, and relevant information about existing bridges. The purpose is to relate this validated knowledge to probabilistic analyses. Bridging the gap between NDT and numerical reassessments indicates reduced numerical uncertainties and residual service time extensions. This paper deals with an application of this approach using measurement data collected by ultrasonic technique at a prestressed concrete bridge. T2 - IABSE Symposium 2019 CY - Guimarães, Portugal DA - 27.03.2019 KW - NDT KW - Measurement KW - Structural safety KW - Concrete bridges KW - Eexisting structures PY - 2019 AN - OPUS4-47714 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CHAP A1 - Küttenbaum, Stefan A1 - Feistkorn, S. A1 - Braml, T. A1 - Taffe, A. A1 - Maack, Stefan ED - Rizzo, P. ED - Milazzo, A. T1 - Methods to Quantify the Utility of NDT in Bridge Reassessment T2 - Lecture Notes in Civil Engineering. European Workshop on Structural Health Monitoring. Special Collection of 2020 Papers - Volume 1 N2 - The purpose of this contribution is to introduce and to apply the developed approach of incorporating non-destructively gathered measurement results (instead of deterministic information and assumptions) into a reassessment model of a typical prestressed concrete road bridge and to outline the advantages. An essential part is the quality evaluation of the non-destructively measured information, that deals primarily with two questions. Could the object or parameter to be obtained reliably detected and if, how accurate are the inspection results achieved? Therefore, the importance of the combination of a probability of detection (POD)-approach and measurement uncertainty calculations is emphasized. With regard to the introduced case-study it is shown, for which structure parameters an assumption deviating from the actual (and measurable) situation has a particularly strong (and possibly arithmetically unfavorable) influence on the structural reliability. Measurements on such parameters are particularly beneficial for a reliable and robust reassessment. In conclusion, the individual reassessment results without consideration and with consideration of evaluated non-destructive inspection results are compared. KW - Non-destructive testing (NDT) KW - Structural safety KW - Concrete bridges KW - Measurement uncertainty KW - Probability of detection (POD) PY - 2021 SN - 978-3-030-64593-9 DO - https://doi.org/10.1007/978-3-030-64594-6_40 SN - 2366-2557 VL - 127 SP - 403 EP - 413 PB - Springer Nature Switzerland CY - Cham, Switzerland AN - OPUS4-52009 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -