Pasarela del Parque Enrique Tierno Galván

In 1994, a unique pedestrian bridge emerged, gracing Madrid’s Parque Enrique Tierno Galván. This is the Pasarela del Parque Enrique Tierno Galván. It elegantly spans the gap between the park’s upper platform and the M30 motorway below. The Pasarela del Parque Enrique Tierno Galván isn’t just a bridge. It’s a lightweight marvel, crafted from laminated steel profiles and wooden crossbeams. From its highest point, a flat, horizontal section extends, culminating in a striking helix that descends to bridge the slope. However, early users of the Pasarela del Parque Enrique Tierno Galván reported a peculiar sensation. Walking across, they experienced discomfort, even dizziness. An investigation was launched to uncover the cause of this unsettling phenomenon. The study revealed that the bridge’s natural oscillation frequencies aligned with the rhythm of human footsteps. This created a coupling effect, amplifying the bridge’s vibrations. The helix design, acting like a spring, exacerbated the lateral oscillation. It was this oscillation, not significant movement, that induced the dizziness. The solution? Increase the Pasarela del Parque Enrique Tierno Galván’s lateral rigidity. This involved adding transversal bracing at strategic points, subtly altering the bridge’s natural frequencies. With just two braces, the frequencies shifted, eliminating the unsettling coupling effect. The Pasarela del Parque Enrique Tierno Galván now stands as a testament to how even the smallest design choices can have a big impact.