Abstract
In order to investigate the aerostatic instability mode and underlying failure mechanism of the new suspension bridge with double main spans, a corresponding program based on aerostatic load increment and two-iteration scheme was developed with considering the effects of aerostatic and geometric nonlinearity. Three double-main-span suspension bridges were taken as a case study to analyze the full range of aerostatic instability with different initial attack angles. Results show that there are two aerostatic instability modes for the double-main-span suspension bridge, one of which is the bilateral antisymmetric instability mode and the other is the single-span instability mode. The critical aerostatic velocity corresponds to the instability mode that occurs first, which is dependent on structural dynamic properties and initial attack angles. In addition, mechanism of the two aerostatic instability modes was discussed in detail.
Highlights
The single-span suspension bridge has been reported to be limited in the design of total length, which is up to 2∼3 km [1]
The nonlinear aerostatic load is induced by the tricomponent wind load which is dependent on the displacement of the deck, as well as the initial attack angle
Considering the effects of aerostatic and geometric nonlinearity, a nonlinear program was developed to analyze the aerostatic stability of three double-long-span suspension bridges: Ma’anshan Yangtze River Bridge (MYB), Taizhou Yangtze River Bridge (TYB), and Wuhan Yingwuzhou Yangtze River Bridge (WYB)
Summary
The single-span suspension bridge has been reported to be limited in the design of total length, which is up to 2∼3 km [1]. The latest record is Akashi Kaikyo Bridge with a central span of 1991 m. It could not meet the requirement for crossing straits and rivers nowadays, such as Yangtze River in China, Messina Strait in Italy, Tsugaru Strait in Japan, and Gibraltar Strait linking European and African Continents [2]. The suspension bridge with two or more main spans, which is one of the most favourable and economical solutions for wide and deep straits with longer span, comes into existence. China has launched three double-long-span suspension bridges across the Yangtze River: Ma’anshan Yangtze River Bridge (MYB), Taizhou Yangtze River Bridge (TYB), and Wuhan
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