Title: New Årsta Railway Bridge - A case study on the long-term Structural Health Monitoring with Fibre Optic Sensors

Author(s): Merit Enckel

Publication: NCR

Volume: 44

Issue: 9

Appears on pages(s): 123-142

Keywords: Concrete bridges, pre-stressing, Structural Health Monitoring, Fibre Optic Sensors, long-term monitoring, creep and shrinkage.

DOI:

Date: 12/15/2011

Abstract:
The New Årsta Railway Bridge was built in 2000-2005. The structure is a unique pre-stressed concrete girder bridge with slender and optimised design. Structural Health Monitoring System was installed on the bridge during construction. One characteristic span is mainly instrumented with several sensors and monitoring is still ongoing. This paper presents the Fibre Optic Sensor system including thermocouples; and their function. Observations, malfunctions and inconvenience during construction, testing and operation are collected, carefully documented and analysed. Strain and temperature data are collected from first casting up to date. Results are highlighted and conclusions are drawn. Recommendations are given, based on the experience gained so far. Furthermore, general, accumulated knowledge about monitoring is given.