The initial structural analysis of the BC MoTI standard timber-deck design revealed key deficiencies. Under the provisions of CSA S6-19, the timber ties were found to fail in both shear and flexure when acting independently. However, Arch Engineers conducted further analysis and identified that composite action between the timber ties and the deck substantially increased load-bearing capacity; ultimately leading to a bridge replacement.
Using advanced RISA 3D software, Arch validated that the composite deck model reduced the maximum factored shear and moment significantly, making the deck design structurally sound under typical loading conditions. This innovative approach not only ensured compliance with code requirements but also optimized the design to meet the long-term durability and performance of the bridge.
In addition to meeting the engineering and safety standards, Arch worked to achieve sustainability and environmental goals. The team prioritized the recycling and reuse of timber and other materials, minimizing waste and reducing the environmental footprint. These efforts aligned with broader environmental targets aimed at promoting sustainable infrastructure development in the region.
Arch also ensured that the design was resilient to future weather events and environmental stressors, incorporating lessons learned from the flooding damage.
Given the urgency of the project and the critical nature of Highway No. 8 as a transportation corridor, Arch Engineers worked closely with all stakeholders to deliver the project ahead of schedule. The ability to complete the bridge and reopen it to traffic promptly was a major achievement, underscoring Arch’s commitment to prioritizing the owner’s best interests while addressing the infrastructure needs.