Tests for flutter stability measures of a long-span suspension bridge with steel truss girders

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Journal of Vibration and Shock ›› 2018, Vol. 37 ›› Issue (13) : 182-189.

LI Ming 1,2,3 SUN Yan-guo 1,2,3 LI Ming-shui 1,2

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Abstract

Here, in order to study the effect of different flutter stability measures on flutter performances of a long-span suspension bridge with steel truss girders, through section model’s wind tunnel tests, Chishui River Bridge being a long-span suspension bridge with steel truss girders in China was taken as an example to study the effects of three stability measures including central slot sealing plate, upper stabilizer and lower stabilizer in use alone or combined on flutter critical wind speeds of the main girder. The varying laws of growth ratio of flutter critical wind speed with variation of sealing rate of slot sealing plate and height parameter of stabilizers were also investigated. Finally, the reliability of the results obtained with section model’s wind tunnel tests was verified with a 1:100 scale full bridge aerodynamic elastic model test. The results showed that sealing central slot can improve flutter stability performance of steel truss girders at a certain level; when setting upper stabilizer solely, flutter critical wind speed of main girder nonlinearly varies with increase in height of upper stabilizer and there exists a sensitive interval; sealing rate of upper stabilizer significantly affects its flutter mitigation effect; flutter mitigation effect of multiple stability measures’ combined use is more significant than that of a single stability measure’s use; flutter mitigation effect of upper central stabilizer is better than that of lower central stabilizer with different uses of measures; sealing rate of central slot and that of upper stabilizer have a certain effect on flutter critical wind speed.

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steel truss girder / suspension bridge / flutter / stability measure / wind tunnel test

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LI Ming 1,2,3 SUN Yan-guo 1,2,3 LI Ming-shui 1,2. Tests for flutter stability measures of a long-span suspension bridge with steel truss girders[J]. Journal of Vibration and Shock, 2018, 37(13): 182-189

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