TY - CHAP A1 - Helmerich, Rosemarie ED - Boller, C. ED - Chang, F.-K. ED - Fujino, Y. T1 - Construction process monitoring at the new Berlin main station N2 - The construction process of the New Berlin Main Station, the former Lehrter Bahnhof, has been monitored from the beginning. In this station, the main European east-western railway connection crosses the north–south railway lines. Four east-western bridges, built in the first construction phase, carry the platforms for international lines and suburban train tracks. The outer two bridges carry the supports of the relatively flat glass roof, too. Since the glass roof is very sensitive to vertical displacements, the authorities required a complex monitoring system. This case study describes long-term measurements with classical and enhanced innovative sensors to monitor vertical displacements of neighboring glass roof supports. Additionally, traditional strain gauges were embedded parallel to long-gauge length fiber-optic strain sensors in the near-surface concrete of the partial prestressed bridges to reliably survey possible changes. The measurements on site go along with long-term laboratory tests on prestressed concrete beams. Researchers study load effects and long-term environmental influences on two large-scale model beams, inside and outside the laboratory. The monitoring system has been working stable as an early warning system for any changes of the structural conditions since 2002. All data are available on line for both the project team and the owner. KW - Long term monitoring KW - Vertical displacement KW - Strain measurement KW - Fiber optic sensors KW - Hydrostatic leveling system KW - Online data KW - Web presentation PY - 2009 SN - 978-0-470-05822-0 IS - Chapter 131 SP - 1 EP - 12 PB - John Wiley & Sons AN - OPUS4-20291 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -