Optimization of cable weight in multi-span cable-stayed bridges. Application to the Forth Replacement Crossing

A novel optimization approach significantly reduces the steel required for cable stays in multi-span cable-stayed bridges, demonstrated through application to the Forth Replacement Crossing (Queensferry Crossing). By treating the cross-sectional area of each cable as a design variable and simulating prestressing forces via temperature increments, researchers minimized material use while accurately computing initial tension forces under dead weight. The study employed a multimodel optimization strategy to account for two distinct construction stages, proposing an optimized spatial distribution of cables that achieved substantial efficiency gains compared to conventional designs.

(Ed.). (2015). Optimization of cable weight in multi-span cable-stayed bridges. Application to the Forth Replacement Crossing. Multi-Span Large Bridges, 511–518. https://doi.org/10.1201/b18567-62