Design Solution · Structural Systems
Design Solution · Dream about it
Depth tapers from springing to a thin centre to match loads.
The deck depth reduces from 4.5m where it meets the rock to just 170mm at midspan, putting material only where bending demand is highest. Shaping the structure to the force diagram minimises steel and visual mass. The principle gives a slender profile from an efficient distribution of material.
Profiling a bridge deck so its depth follows the bending moment diagram — deep at the supports, thin at midspan — is a classical efficiency move: material sits only where bending stress demands it, reducing both weight and visual bulk. The principle is textbook structural engineering and appears across reinforced concrete, steel and composite bridges globally, so it is not an innovation in itself but an intelligent application of first principles in a context where profile freedom existed. The value here is aesthetic and material: the 4.5m-to-170mm taper produces a deck that reads as almost impossibly slender from certain angles, which matters in a landscape-sensitive setting. The practical trade-off is that a variable cross-section is more complex to form and fabricate than a uniform beam — shuttering costs, connection details and inspection access all increase as the geometry diverges from prismatic. Evidence is claimed only, so the specific fabrication and long-term performance story for this particular bridge is unverified in the record; the principle itself is well proven.
#structural efficiency #material reduction #bridge