The 481 m long Alexandra Bridge, built in the 1960’s, crosses the Fraser River via a 256 m steel arch main span and steel girder approach spans. In 2009, Associated Engineering carried out a detailed condition and renewal options assessment, and recommended rehabilitation of the bridge. Subsequently, Associated Engineering carried out the rehabilitation design of the structure.
Associated Engineering first conducted a detailed bridge inspection including a visual inspection of all accessible components using a bridge inspection truck for access below deck level. The inspection identified that the steel approach span girders and arch steelwork were in fair condition with minor corrosion; however, the concrete deck had significantly cracking and delamination. Following the investigation of renewal options and life cycle cost analysis, we developed a renewal scheme that incorporated a partial-depth concrete deck overlay to address concrete deterioration and widen the roadway deck to 12 m.