Measurement of Vertical Deformations in Bridges Using an Innovative Elastic Cell System



A new technique (the elastic cell system) for measuring vertical displacements in bridge decks during load tests is presented. This method was specially designed to overcome the limitations of the existing techniques which arise when measurements need to be taken in bridge spans where access is diffcult such as over valleys or over water, without a reference land point under the deck. The technique was first developed and calibrated in the laboratory and then subjected to field tests in association with bridge load test measurements which are presently used by ICIST in bridge testing.