TY - CONF A1 - Hong, Shuxian A1 - Lai Wai-Lok, Wallace A1 - Helmerich, Rosemarie A1 - Milmann, Boris ED - Biondini, F. ED - Frangopol, D.M. T1 - NDT-based monitoring of accelerated steel corrosion in concrete N2 - This paper presents an example of monitoring the corrosion process with NDT techniques. The impressed current technique was used for accelerating reinforcement corrosion in a large-sized concrete slab with chloride contamination. Periodic NDT-CE inspections were carried out making use of ground penetrating radar (GPR), ultrasonic echo array and half-cell potential measurement. The work presents an example of monitoring the corrosion process with NDT techniques and shows the way to the ultimate goal of finding objective tools to evaluate the corrosion state. The work was carried out during the Initial Training Network SmartEN, funded by the European Commission. T2 - IABMAS 2012 - 6th International conference on bridge maintenance, safety and management CY - Stresa, Lake Maggiore, Italy DA - 08.07.2012 KW - Concrete KW - Reinforcement corrosion KW - Nondestructive testing KW - Ground penetration radar KW - Ultrasonic echo PY - 2012 SN - 978-0-415-62124-3 SN - 978-0-203-10338-8 SP - 1 EP - 8 PB - CRC Press CY - London, UK AN - OPUS4-29581 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Hong, Shuxian A1 - Lai Wai-Lok, Wallace A1 - Helmerich, Rosemarie T1 - Monitoring accelerated corrosion in chloride contaminated concrete with ground penetrating radar N2 - This study investigates the effect of chloride contamination and reinforcing steel corrosion in a concrete slab on the ground penetrating radar (GPR) signal. A reinforced concrete slab with two layers of steel bars and chloride contamination was used in this study. The corrosion process was accelerated by impressed current technique in both wet and dry condition to simulate the corrosion in both wet and dry seasons. During the process, GPR measurements were carried out periodically to monitor signal changes. The results were analyzed to study the GPR signal amplitude, travel time, frequency spectrum and signal energy response to chloride contamination and reinforcing steel corrosion in concrete. T2 - 14th International conference on ground penetrating radar - GPR 2012 CY - Shanghai, China DA - 04.06.2012 KW - GPR KW - Reinforcing steel KW - Corrosion KW - Chloride PY - 2012 SN - 978-1-4673-2663-6 SP - 1 EP - 6(?) AN - OPUS4-26122 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Helmerich, Rosemarie A1 - Niederleithinger, Ernst A1 - Trela, Christiane A1 - Bien, J. A1 - Kaminski, T. A1 - Bernardini´, G. T1 - Multi-tool inspection and numerical of an old masonry arch bridge N2 - Complex special inspection of an old masonry arch bridge according to the Guideline on Inspection and Condition Assessment of Railway Bridges and numerical analysis of the structure are presented. The guideline summarises recommendations for the step-by-step investigation of railway bridges applying enhanced methods developed during the EU-funded project Sustainable Bridges. For the investigation of the arch barrel, the ballast parameters and the inner structure of the backfill behind the arch barrel a number of various advanced non-destructive and minor-destructive testing methods were applied. Deformation of the structure during load tests was measured using three independent measuring systems: laser vibrometer, LVDT and microwave radar. Results of calculations performed with 2D and 3D models based on FEM are compared with the field load tests. Sensitivity of the ultimate load of the structure to investigated parameters is studied in FE model. Some general conclusions according to methods of testing and modelling of masonry arch bridges are presented and discussed. KW - Masonry bridges KW - Non-destructive testing KW - Bridge inspection KW - Finite element method PY - 2012 SN - 1573-2479 VL - 8 IS - 1 SP - 27 EP - 39 PB - Taylor & Francis CY - London [u.a.] AN - OPUS4-27425 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Helmerich, Rosemarie A1 - Bien, J. T1 - 100 Jahre Kaiserbrücke/Grunwaldzki-Brücke in Wroclaw (Polen) KW - Zustandsbewertung KW - Brückenmessung KW - Altstahl KW - Baugeschichte PY - 2012 DO - https://doi.org/10.1002/stab.201201524 SN - 0038-9145 SN - 1437-1049 SN - 0932-6375 VL - 81 IS - 2 SP - 156 EP - 159 PB - Ernst CY - Berlin AN - OPUS4-25803 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Helmerich, Rosemarie T1 - Theoretical and experimental analysis of historical bridges T2 - SAHC 2012 - 8th International conference on structural analysis of historical constructions CY - Wroclaw, Poland DA - 2012-10-15 PY - 2012 AN - OPUS4-27030 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Helmerich, Rosemarie T1 - Full scale fatigue testing of original truss members and connections T2 - 6th International Conference on Bridge Maintenance, Safety and Management (IABMAS 2012) CY - Stresa, Italy DA - 2012-07-08 PY - 2012 AN - OPUS4-26522 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Helmerich, Rosemarie T1 - Materials Testing of Historic Structures T2 - ERASMUS Intensive Programme, European Summer School on Construction History, CH.ESS 2012 CY - Brussels, Belgium DA - 2012-07-21 PY - 2012 AN - OPUS4-26523 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Helmerich, Rosemarie ED - Biondini, F. ED - Frangopol, D.M. T1 - Full scale fatigue testing of original truss members and connections N2 - The analysis of the I-35 W bridge collapse in Mineapolis, Minnesota (NTSB 2008) initiated a discussion about gusset plates in truss girders again. In the past, the Federal Institute for Materials Research and Testing (BAM) has performed series of laboratory fatigue tests on original riveted truss girders in their laboratories. Four 10 m long original truss girders were tested under different fatigue loading. Gusset plates connecting the most highly stressed diagonal truss members with the chords were the weakest elements of this type of structure. A strengthening method was tested for extension of the fatigue life. The test results were input in assessment procedures for further main girders being historical monuments. The results of test series performed at BAM and other fatigue tests in the world were sources for the Recommendation for the assessment of the remaining fatigue life, issued by the European Convention for Constructional Steelwork (ECCS) together with the European Joint Research Center (JRC). T2 - IABMAS 2012 - 6th International conference on bridge maintenance, safety and management CY - Stresa, Lake Maggiore, Italy DA - 08.07.2012 KW - Existing bridges KW - Laboratory testing KW - Fatigue KW - Remaining service life KW - Weak details KW - Materials testing PY - 2012 SN - 978-0-415-62124-3 SN - 978-0-203-10338-8 SP - 8 PB - CRC Press CY - London, UK AN - OPUS4-29455 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Bien, J. A1 - Helmerich, Rosemarie ED - Jasienko, J. T1 - Theoretical and experimental analysis of historical bridges T2 - SAHC 2012 - 8th International conference on structural analysis of historical constructions CY - Wroclaw, Poland DA - 15.10.2012 KW - Historical bridges KW - Theoretical analysis KW - Experiments KW - Diagnostics PY - 2012 SN - 978-83-7125-216-7 SN - 0860-2395 VL - 1 SP - 45 EP - 63 PB - DWE CY - Wroclaw, Poland AN - OPUS4-26830 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -