The 'wind-induced vibration' of a long-span cable-stayed bridge deck is controlled by:
Choose the correct answer
Only by increasing deck self-weight
Streamlined deck section (aerofoil), guide vanes/fairing, and tuned mass dampers (TMD) — prevent flutter and VIV
Painting the deck with anti-rust paint
Only by using shorter spans
Correct Answer
B. Streamlined deck section (aerofoil), guide vanes/fairing, and tuned mass dampers (TMD) — prevent flutter and VIV
Why is this the answer?
Wind effects on bridges: (1) Flutter (self-excited aeroelastic instability — coupled bending + torsion → catastrophic, Tacoma Narrows); (2) Vortex-induced vibrations (VIV) — lock-in at critical wind speed; (3) Buffeting (turbulent wind). Control: (1) Aerodynamic deck shape (streamlined box girder); (2) Fairing and guide vanes; (3) Tuned mass dampers (TMD); (4) Increased torsional stiffness (π-shape deck section). Wind tunnel testing mandatory for long-span bridges.
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