Abstract
High performance steels for bridges can possess any of the following properties that have been improved relative to conventional steels: high strength with low yield-to-tensile strength ratio, high fracture toughness, longer fatigue life, high corrosion resistance, better weldability, easy fabrication and high Young's modulus. The materials need to be economically competitive with other construction materials. Some of the recently developed steels used in bridges in Japan are: • new steel with constant material strength up to 100 mm plate thickness, • low yield steel with excellent ductility, • longitudinally profiled plate, • surface-treatment weathering steel, • reduced preheat-type high strength steel, and • titanium-clad steel plates. The second part of this article reviews current innovative erection methods for long-span cable-supported bridges. Emphasized in the erection methods are topics related to pilot rope erection with helicopter, lifting method in busy sea lanes with complex tidal currents, and catwalks without storm cable system. The review focuses mainly on developments in Japan. Finally, in conclusion, the review identifies future research needs.
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