TY - GEN A1 - Habel, Wolfgang A1 - Hofmann, Detlef A1 - Kohlhoff, Harald A1 - Knapp, Jürgen A1 - Brandes, Klaus A1 - Haenichen, H. A1 - Inaudi, D. ED - Inaudi, D. T1 - Complex measurement system for long-term monitoring of prestressed railway bridges of the new "Lehrter Bahnhof" in Berlin T2 - Smart structures and materials 2002 - Smart sensor technology and measurement systems T2 - Smart structures and materials 2002 - Smart sensor technology and measurement systems CY - San Diego, CA, USA DA - 2002-03-18 KW - Fiber-optic sensors KW - Monitoring KW - Structure behaviour PY - 2002 SN - 0-8194-4442-1 DO - https://doi.org/10.1117/12.472624 SN - 1605-7422 N1 - Serientitel: SPIE proceedings series – Series title: SPIE proceedings series IS - 4694 SP - 236 EP - 241 PB - SPIE CY - Bellingham, Wash. AN - OPUS4-1456 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Habel, Wolfgang A1 - Kohlhoff, Harald A1 - Knapp, Jürgen A1 - Helmerich, Rosemarie A1 - Inaudi, D. ED - Casciati, F. T1 - Complex measurement system for long-term monitoring of prestressed railways bridges in the new Lehrter Bahnhof in Berlin T2 - Proceedings of the Third World Conference on Structural Control T2 - 3rd World Conference on Structural Control (WCSC-3) CY - Como, Italy DA - 2002-04-07 KW - Monitoring KW - Structure behaviour KW - Fibre-optic sensors KW - Data acquisition PY - 2003 SN - 0-471-48980-8 VL - 2 SP - 713 EP - 719 PB - Wiley CY - Chichester AN - OPUS4-2375 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Helmerich, Rosemarie A1 - Werner, Klaus-Dieter A1 - Niemann, Joachim A1 - Kohlhoff, Harald T1 - Langzeitmonitoring Lehrter Bahnhof T2 - Beiträge zur Fachtagung Sonderkapitel aus dem Brücken- und Ingenieurbau T2 - Fachtagung "Sonderkapitel aus dem Brücken- und Ingenieurbau" CY - Berlin, Deutschland DA - 2003-10-21 KW - Monitoring KW - Bauwerksüberwachung KW - Sensoren PY - 2003 SN - 3-86509-043-5 SP - 92 EP - 99 PB - Wirtschaftsverl. NW, Verl. für neue Wissenschaft CY - Bremerhaven AN - OPUS4-2727 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Schilder, Constanze A1 - Hofmann, Detlef A1 - Kohlhoff, Harald A1 - Habel, Wolfgang ED - Ramos, G. A. T1 - Structure-integrated fiber-optic strain wave sensor for concrete pile testing and monitoring T2 - SHMII-5 - 5th International conference on structural health monitoring of intelligent infrastructure (Proceedings) N2 - Reinforced concrete piles are used in case of structures that are constructed on soft ground to transfer the loads into deeper strata with sufficient bearing capacity. In order to determine the pile’s behavior and possible damage, static and dynamic pile tests are carried out. Dynamic measurements taken from the pile head can show the bearing behavior and structural integrity by using the theory of wave propagation. In order to receive more precise information about the pile features, now, a string of sensors is embedded at different levels of the pile. A fiber optic strain wave sensor, based on the extrinsic Fabry-Perot interferometer (EFPI), has already been developed and tested in full-scale field tests by Schallert (2010). It was possible to detect the introduced deformation caused by the static load and the dilatational wave during dynamic loading. Although the full-scale tests were successful, the engineering design of the sensor body left room - from the economical point of view - to be optimized. After laboratory tests with the optimized sensor, a cast-in-situ bored pile has been built at the BAM Test Site Technical Safety in Horstwalde, South of Berlin. Additionally to the EFPI sensors, fiber Bragg grating (FBG) sensors, temperature sensors and resistance strain gauge (RSG) sensors are embedded in order to compare the signals with each other. In this paper, the modified sensor and the Setup of the cast-in-situ bored pile along with results of dynamic tests are shown. T2 - SHMII-5 - 5th International conference on structural health monitoring of intelligent infrastructure CY - Cancún, Mexico DA - 11.12.2011 KW - Fibre optic sensors KW - Monitoring KW - Concrete pile KW - Foundation KW - Integrity testing PY - 2011 IS - Topic_04.Cat_4.2-abs002 SP - 1 EP - 8 PB - National Autonomous University of Mexico CY - Mexico City AN - OPUS4-25142 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Bartholmai, Matthias A1 - Werner, Klaus-Dieter A1 - Kohlhoff, Harald A1 - Helmerich, Rosemarie A1 - Daum, Werner ED - Aulova, Alexandra ED - Rogelj Ritonja, A. ED - Emri, I. T1 - Long-Term measurement of vertical displacements at the outer concrete bridges of the Berlin Main Station T2 - 33rd Danubia- Adria Symposium on Advances in Experimental Mechanics - BOOK OF ABSTRACTS N2 - Berlin Main Station is the largest multi-level station in Europe. Its daily passenger number amounts to over 300.000. Structures built for such a large number of people require a high-level safety standard. The station was built on the inner city site of the historic Lehrter Bahnhof. The conditions for building and start of operation were challenging by several reasons. The typical sandy ground with a high level of groundwater makes the permanent static stability of such a complex structure difficult. Several completed, ongoing, and planned construction activities in the immediate vicinity of the station influence the ground settlement of the whole area. On basis of the structural design an impact prediction was calculated, which expected certain vertical displacements particularly between the single columns of the outer concrete bridges of the building. These columns support the glass roof construction, which only allows a defined limit of displacement. In order to avoid damage, a concept for monitoring and adjusting potentially occurring displacements was developed for installation at the outer bridges of the station. T2 - 33rd Danubia- Adria Symposium on Advances in Experimental Mechanics CY - Portorož, Slovenia DA - 20.09.2016 KW - Berlin Main Station KW - Differential displacements KW - Hydraulic levelling system KW - Laser-based displacement measuring system KW - Monitoring KW - Strain measurements PY - 2016 SN - 978-961-94081-0-0 SP - 166 EP - 167 CY - Ljubljana AN - OPUS4-37646 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -