Within the contact zone of Trogir, a UNESCO World Heritage Site we have designed a new steel pedestrian bridge that redefines its role beyond a simple crossing of the sea channel. Envisioned as a vibrant social hub and an architectural landmark, the bridge integrates seamlessly into its historical surroundings while establishing a distinct identity. t subtly references Trogir’s esteemed shipbuilding heritage and maritime spirit, reinforcing a deep connection between the city’s past and its evolving urban fabric.
The bridge’s form is defined by a steel shell structure with variable cross-sections, shaped as an asymmetric hyperbolic paraboloid. This design results in a remarkably slender, lightweight, and visually refined structure that does not impose on its surroundings but instead enhances and enriches them, adding a contemporary layer to the historical context. The bridge does not create a visual barrier to the city’s historic landmarks; rather, its highest point acts as an “invisible boundary,” preserving the integrity of Trogir’s old town while introducing a contemporary layer to the landscape.
The interior of the bridge's structural shell showcases a caisson system crafted from flat steel, a construction technique deeply rooted in shipbuilding. This construction method mirrors the classic ship’s double-bottom structure, reinforcing the bridge’s symbolic and physical connection to Trogir’s maritime legacy. This deliberate choice resonates with the bridge's location in a city that used to be globally recognized for its shipbuilding industry, where generations of residents have contributed to the local shipyard's legacy.
One of the project’s most remarkable achievements was its expedited timeline, with the entire process—from winning the architectural competition to final construction—completed within just two years. This demanded exceptional coordination and adaptability, particularly when unforeseen challenges arose, such as the inadequacy of existing foundations. These structural issues required innovative, budget-conscious solutions. By collaborating with local experts and applying advanced engineering techniques, we optimized materials and construction methods to maintain both quality and financial feasibility.
A key factor in this efficiency was the bridge’s off-site fabrication. Built as a single element in a nearby shipyard, it was transported by barge and installed onto pre-prepared abutments in the Foša area within a single day. This minimized disruption while demonstrating the skill of the local shipbuilding industry. The project’s seamless execution highlights how modern engineering can integrate efficiency with historical sensitivity, ensuring both structural integrity and contextual harmony.
To ensure longevity and aesthetic cohesion, the bridge's exterior is finished with a three-component coating incorporating metal powder. This specialized treatment develops a Corten-like rust patina over time, reminiscent of weathered steel, while simultaneously preserving the structural integrity of the bridge. Capitalizing on local expertise, the bridge was fabricated as a single unit in a nearby shipyard. This facilitated a streamlined transport and installation process; the entire bridge was transported by barge in a single day and positioned onto pre-prepared abutments at the location.
Beyond its structural ingenuity, the bridge was designed with user experience in mind. A carefully integrated pedestrian staircase follows along the line of the gentlest ascent on the bridge’s spatially curved form. The design of the treads ensures a comfortable and gradual slope, creating a smooth and pleasant transition for pedestrians.
The walking surface of the bridge is differentiated to enhance comfort and functionality. Within the staircase area, a combination of rubber and fine-fraction stone as a baseline provides a firm, stable surface while preventing any undesirable flexing. Outside the staircase zone, a softer rubber surface is employed, prioritizing pedestrian comfort and ease of movement.
On the steeper sections of the bridge, informal seating areas are strategically placed to encourage spontaneous gatherings and interaction on the north side. Facing Fortin Park, the bridge structure features perforation incorporating a net. This creates a unique space for sitting, reclining, and play, distinguishing the park area from the surrounding urban environment. This perforation not only visually lightens the overall structure but also establishes a visual dialogue between the areas above and below the bridge, fostering a sense of connection and recognition for users.
Through its thoughtful design, the bridge is more than just an infrastructure element—it is a dynamic part of the city's cultural and historical fabric. By merging contemporary engineering with Trogir’s rich shipbuilding heritage and a focus on social engagement, the bridge honors the city’s maritime legacy while addressing the demands of modern urban life.
Its sustainable and innovative execution is reflected in both material selection and construction methodology. Locally sourced and recycled materials reduce its ecological footprint, while off-site fabrication and rapid on-site assembly ensure minimal environmental impact and efficient installation. More than a functional crossing, the Trogir Bridge is an architectural and cultural landmark, seamlessly integrating into its historical surroundings while introducing a bold yet respectful contemporary presence. Its design and execution exemplify how modern infrastructure can both preserve heritage and enhance the urban environment.
