EXHIBIT 015 USA / C. 1930s
Pacific Strait
Suspension Bridge
THE SCIENCE OF LOAD, CABLE & WIND
ILLUSTRATIVE RECONSTRUCTION
NOT AN OFFICIAL MODEL
NOT AN OFFICIAL MODEL
WEBGL2 • QUALITY HIGH
Idealised parabolic cable with uniform vertical deck loading.
Generic illustrative reconstruction inspired by the suspension-bridge engineering of the era; not surveyed from any single landmark. Engineers, fabricators, cable-spinning crews and ironworkers brought such monumental crossings into service.
Long-span suspension bridges brought cities and shorelines together while advancing steel construction, aerodynamic thinking, structural calculation and durable civil infrastructure.
From a separate tower force balance, Hcheck = V / (4f/L). Compare against the cable equation.
Operating principle: A suspended deck sends gravity loads through vertical hangers into main cables, whose tension is resolved by towers and end anchorages.
Textbook model: For a uniformly loaded parabolic main cable, each cable carries an equivalent distributed vertical load w over main span L. The sag f controls horizontal force H = wL²/(8f); half-span reaction V = wL/2; tower resultant T = √(H²+V²). The independent check applies H = V/(4f/L). Wind drag is F = ½ρCdAv²; single-degree-of-freedom elastic response δ = F/k and natural period 2π√(m/k).
Simplifications: Constant deck load, symmetric cable, two-dimensional static gravity load, lumped wind area, linear stiffness and one mass mode. No live load distribution, gust spectrum, detailed member stress, nonlinear sag, actual foundation design, fluid–structure instability or certified safety calculation. Scene scale is artistic, not a surveyed dimension; model inputs are teaching examples rather than historical specifications.
Visual classification: Physics equations: genuine textbook approximations under stated assumptions. Structural layout: historical-era-inspired illustrative reconstruction. Flow highlights, sea, shore, animation and deflection: educational schematics, not measured field data.
Notice: Illustrative reconstruction, not an official model and not affiliated with any institution, company or manufacturer.
All answers follow from the model and equations above.