INNOVATION IN BRIDGES
In Queensland, Australia, the AU$63 million Kurilpa pedestrian bridge links
Brisbane’s central business district with the newly developed arts and cultural
precinct on the city’s South Bank. Inspired by the concept of tensegrity—a
modern art form and structural system—the multimast, cable-stay structure is
470 meters long and features two large viewing and relaxation platforms, two
rest areas, and a continuous all-weather canopy for the entire length of
The design team modeled the tensegrity superstructure in
GenerativeComponents while the bridge centerline geometry was being
finalized in MX. Horizontal and vertical alignments were balanced against
disability access requirements and approach structure clearances. To find a
clash-free solution for superstructure geometry, the team dynamically adjusted
the model using GenerativeComponents and Bentley Structural.
T.Y. Lin International
David Kreitzer Lake Hodges Bicycle/Pedestrian Bridge
Escondido, California, United States
This $8.8 million bridge—the longest stress-ribbon bridge in the world—is a
nonmotorized north/south crossing over Lake Hodges and the San Dieguito
River Valley Open Space Park that provides recreational users with access to the
network of trails on both sides of the lake. T. Y. Lin coordinated activities among
the general contractor, Caltrans, the city of San Diego, and the San Dieguito
River Park, all of whom had jurisdiction over various portions of the project.
T. Y. Lin engineers chose the stress-ribbon bridge type to minimize visual impact.
With three spans of 330 feet and a superstructure depth of only 16 inches, the
bridge has a depth-to-span ratio of 1:248. The thin bridge profile, narrow 14-
foot width, and natural sag between supports create a ribbon of concrete that
resembles one of the many surrounding trails. The team used MicroStation for
plan production, improving savings for both cost and schedule.