Effects of a cross diaphragm on the wind-resistant performance of twin parallel deck bridges

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Journal of Vibration and Shock ›› 2020, Vol. 39 ›› Issue (16) : 141-147.

MENG Xiaoliang1,ZHU Ledong2,3

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Abstract

Taking the two plans of the Quanzhou Bay Bridge as an example, the modal characteristics of the two type structures were investigated by numerical analysis.The aerodynamic stability, vortex-induced vibration property of the bridge deck(s) were investigated via wind tunnel tests.The results show that the two plans of the twin-deck bridge have notable differences on the modal characteristics.Comparing to the plan of twin decks with a cross diaphragm, the twin decks without a cross diaphragm have much more complicated modal features.It has two types of bending and torsion mode in which the decks move in the same direction or in the opposite direction.The two different types of decks will deform dissimilarly in the flow, which result in the different aerodynamic stability and vortex-induced vibration performance of the two different structures.The twin decks with a cross diaphragm have better aerodynamic stability performance than the decks without a cross diaphragm; however, for the performance of vortex-induced vibration, the former is worse than that of the latter.

Key words

wind engineering / twin parallel deck / modal characteristic / aerodynamic stability / vortex-induced vibration

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MENG Xiaoliang1,ZHU Ledong2,3. Effects of a cross diaphragm on the wind-resistant performance of twin parallel deck bridges[J]. Journal of Vibration and Shock, 2020, 39(16): 141-147

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