Timber, Luke C.2022-04-282022-04-282022https://udspace.udel.edu/handle/19716/30832In this study, non-contact, vision-based measurement techniques using digital image correlation are compared to displacement measurements obtained from mounted sensors to analyze the live load distribution in two candidate slab-girder bridges. Vision-based measurement techniques have the potential to eliminate the need to mount sensors and capture data in a contactless way for bridge monitoring and evaluation, especially for bridges without documentation. The primary contribution of this paper is to serve as such a case study for the specific application of full-scale load testing of bridges using digital image measurements to monitor displacements. For one of the bridges, which did not have available bridge plans, a companion analytical model is created in ABAQUS to compare the live load distribution to the girders versus displacement measurements obtained from non-contact, vision-based measurements. However, as expected standard AASHTO (2020) methodology provided more conservative distribution factors in this case by more than ten percent for the slab-girder bridge tested with four girders. The difference in live load distribution factors obtained from mounted strain gauges to the non-contact and mounted displacement sensors is discussed.Bridge load testingBridgesDigital image measurementDistribution factorsFinite element modelingLive load distributionThesis13128643942022-03-15en