| This dissertation investigates the implementation of in-situ load testing of concrete structures to validate existing load test procedures, and the use of emerging materials to upgrade structural deficient concrete members. It consists of six technical papers that cover these two closely related topics. The first area of research is dedicated to the validation of load test procedures, comparing the results between two different protocols by investigating acceptance criteria as well as margin of safety of reinforced (RC) concrete members. The second area of research is dedicated to the use of composite materials to improve the structural performance of deficient RC and PC members. Two-and one-way RC slabs with openings have been tested, prior to and after the strengthening, in laboratory and field environments. Continuous RC beams strengthened with fiber reinforced polymers (FRP) materials on both positive and negative regions, have been investigated to study the effect of moment redistribution. A new family of composite materials based on high-strength steel cords (SRP) has been field tested on flexural upgraded double-T PC beams. An RC deck of a bridge has been strengthened with two FRP technologies and in-situ load tested to validate the technology.; The findings of this dissertation concluded that there is high potential for the development of new field evaluation techniques based on scientific criteria that can allow engineers to rationally assess the capacity of an existing structure. Similarly, emerging materials, such as FRP and SRP, can provide practitioners with effective solutions to upgrade weakened concrete members. Analytical evidence showed how existing design guidelines have proven to be effective in anticipating the ultimate capacity of concrete members strengthened with such emerging materials. |
