Location

London

Event Website

http://www.csce2016.ca/

Description

Strain gauges were installed in the girders and deck of an integral abutment bridge to determine the behaviour of the superstructure to daily and seasonal thermal fluctuations. The two-span, 76 m-long bridge has no expansion joints; rather, the prestressed-concrete girders are cast directly into the abutments which are in turn supported by flexible pile foundations. Details of field instrumentation along with monitored data over a period of eight years are presented in this paper. Gauges measured the longitudinal strain in the girders and deck and were positioned at different elevations to provide a strain distribution across the superstructure depth. From the strain data, moments were computed at each of the installation locations. Data indicate that the superstructure responds to thermal fluctuations as expected with midspan moments smaller in magnitude when compared to the moments measured at the abutment and pier locations. Furthermore, data confirm that the level of sun exposure affects the thermally-induced moments measured in the girders.


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Jun 1st, 12:00 AM Jun 4th, 12:00 AM

STR-997: INSTRUMENTATION AND LONG-TERM MONITORING OF AN INTEGRAL-ABUTMENT BRIDGE SUPERSTRUCTURE

London

Strain gauges were installed in the girders and deck of an integral abutment bridge to determine the behaviour of the superstructure to daily and seasonal thermal fluctuations. The two-span, 76 m-long bridge has no expansion joints; rather, the prestressed-concrete girders are cast directly into the abutments which are in turn supported by flexible pile foundations. Details of field instrumentation along with monitored data over a period of eight years are presented in this paper. Gauges measured the longitudinal strain in the girders and deck and were positioned at different elevations to provide a strain distribution across the superstructure depth. From the strain data, moments were computed at each of the installation locations. Data indicate that the superstructure responds to thermal fluctuations as expected with midspan moments smaller in magnitude when compared to the moments measured at the abutment and pier locations. Furthermore, data confirm that the level of sun exposure affects the thermally-induced moments measured in the girders.

http://ir.lib.uwo.ca/csce2016/London/Structural/118