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This study evaluates the use of Negative Imaginary (NI) theory to model and control forces in external prestressing cables used in retrofitting bridge superstructures. The study analytically and experimentally applied the concept to assess the system robustness and its overall performance. A small-scale prototype was built to represent an aged bridge superstructure member. The NI control system was proven to behave robustly and successfully performed as desired. The system was also compared to two other schemes on the prototype from the structural performance perspective. These schemes are the ‘No-prestressing’ and ‘Passive prestressing’ schemes. The actively controlled system was able to limit the superstructure deflections and stresses under the applied vehicular live load compared to the other two schemes.

Retrofitting of bridge superstructures using negative imaginary control theory