Client: County of Renfrew
Location: County of Renfrew, Ontario
Year Completed: 2021
J.L. Richards & Associates Limited (JLR) was retained by the County of Renfrew (County) to perform biennial Ontario Structure Inspection Manual (OSIM) inspections on 136 bridge and culvert structures. In addition to updating the Structure Inspection Forms, Bridge Condition Index, and site photographs of existing conditions, JLR also provided a comprehensive list of all structures requiring maintenance, rehabilitation or replacement as part of the Bridge Management Summary Report. These lists prioritize and highlight structures in poor condition that require major repair/rehabilitation. In addition to the 136 OSIM inspections, enhanced OSIM inspections were performed on 14 bridge structures. These inspections included an up-close visual and hands-on review of the structures including a concrete delamination survey (concrete sounding) of all exposed elements to assess deterioration beyond the surface (such as concrete delamination). A “bridge master” unit was required for this aspect of the project to attain the required access to review the underside of the bridge superstructure (girders, soffit, diaphragms, etc.).
Load Carrying Capacity Evaluation were also performed on 12 structures as part of this project. In addition to updating the OSIM for these 12 bridge structures, JLR performed a structural assessment of the load carrying capacity and expected remaining service life of these structures under the current traffic conditions (based on the provided annual average daily traffic [AADT] values). For structures that are currently load rated, findings also stated whether the current load rating is acceptable or recommend a new safe load rating.