Aurora and 102nd Pedestrian Bridge Seismic Resilience

The seismic retrofit of the N 102nd St/Aurora Ave N Pedestrian Bridge introduces an innovative approach that emphasizes the use of cellular concrete to enhance the bridge’s structural integrity. As an older bridge that does not meet current seismic standards, the retrofit aims to provide essential vertical support for the existing spiral ramp. In addition the ramp could not be removed without triggering ADA compliant replacements which was not feasible.

Utilizing lightweight cellular concrete, forms and fill are strategically placed beneath the ramp to effectively reinforce the structure. This material is particularly advantageous due to its reduced weight, which alleviates stress on the existing framework while still providing robust support. By integrating cellular concrete into the retrofit process, the project not only strengthens the bridge’s ability to withstand potential earthquake impacts but also maintains its original architectural features.

Most of the work will be conducted beneath the bridge, ensuring that the aesthetic and functional aspects remain unchanged. The use of cellular concrete allows for a seamless reinforcement process, enhancing the bridge’s resilience without disrupting its current use or operation. This innovative application of modern materials illustrates a commitment to safety and structural longevity, enabling the bridge to meet contemporary seismic standards while preserving its historical significance.