27 June 2002 Complex measurement system for long-term monitoring of prestressed railway bridges of the new Lehrter Bahnhof in Berlin
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Abstract
A new central railway station - Lehrter Bahnhof - is being built in Berlin. Because of construction activities in immediate vicinity and because of difficult soil conditions, different vertical displacements have to be expected. In order to avoid damage to the bridges and to a widely spanned glass roof which will be supported by two concrete bridges these two bridges have to be monitored with regard to their deformation performance right from the beginning of construction until commissioning as well as later on for several years. For this purpose, a monitoring concept has been developed and sensors with excellent long-term stability have been chosen. This paper describes the system for monitoring settlements and heaves by means of laser-based optics and hydrostatic leveling. Additionally, strain and inclination of the prestressed concrete bridges are redundantly monitored by embedded long-gage length fiber-optic strain sensors as well as resistive strain gages, and inclinometers. Measurements on-site are referenced by measurements on two test beams well-defined loaded under laboratory and field conditions. The paper also describes the measuring concept and the sensor techniques as well as installation of the sensor system and first results.
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Wolfgang R. Habel, Detlef Hofmann, H. Kohlhoff, J. Knapp, K. Brandes, H. Haenichen, Daniele Inaudi, "Complex measurement system for long-term monitoring of prestressed railway bridges of the new Lehrter Bahnhof in Berlin", Proc. SPIE 4694, Smart Structures and Materials 2002: Smart Sensor Technology and Measurement Systems, (27 June 2002); doi: 10.1117/12.472624; https://doi.org/10.1117/12.472624
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