Project Overview
Bridges are designed to be strong and resilient, but even well-engineered structures can experience vibrations from pedestrian foot traffic. At the Waller Creek Bridges in Austin, TX, this challenge became evident, prompting the need for an effective vibration mitigation solution. Our team successfully installed nine Tuned Mass Dampers (TMDs) across three hanging bridges, each spanning between 130 and 150 feet, significantly reducing both lateral and vertical vibrations.
The Challenge
Suspended pedestrian bridges are particularly susceptible to vibrations, especially when subjected to rhythmic foot traffic. The Waller Creek Bridges, popular among pedestrians and cyclists, exhibited noticeable movement, raising concerns about comfort and long-term performance. Addressing this required a targeted approach—one that could effectively absorb and counteract vibrations without altering the bridge’s structural integrity.
The Solution: Tuned Mass Dampers
TMDs are dynamic devices designed to counteract vibrations by moving in opposition to the oscillations of the structure. For this project, we strategically placed nine TMDs across the three bridges, carefully tuning them to target both lateral and vertical motion. This intervention significantly improved stability, making the bridges feel more secure and comfortable for users.
Overcoming Installation Challenges
This project was far from straightforward. The unique constraints of the site made access difficult, requiring careful planning and coordination. Additionally, the compact design of the bridges left little room for large damping devices, necessitating a customized approach. Scheduling was another critical factor, as work needed to be completed efficiently to minimize disruptions to the public. Despite these challenges, our team executed the installation successfully, demonstrating precision and expertise in structural vibration control.
The Outcome
Following the installation of the TMDs, the bridges now exhibit dramatically reduced vibrations, providing a smoother and more stable experience for pedestrians. This project stands as a testament to how modern engineering solutions can enhance the usability and longevity of existing infrastructure.
Explore More
We’re proud of our work on the Waller Creek Bridges and excited to share our expertise in vibration mitigation. Check out the images below to see the installation process and the final results. If you’d like to learn more about how TMDs can enhance structural stability, feel free to reach out.
