Girder end longitudinal displacement mechanism of long-span suspension bridge under moving vehicles

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Journal of Vibration and Shock ›› 2021, Vol. 40 ›› Issue (19) : 107-115.

HUANG Guoping1,2, HU Jianhua1,3, HUA Xugang1, WANG Lianhua1, CUI Jianfeng4

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Abstract

To study the mechanism of longitudinal displacement at girder ends of large-span suspension bridge under moving vehicle loads, deformation characteristics of suspension bridge under non-symmetric vertical loads were analyzed based on the deflection theory. The longitudinal dynamic equation and resonance velocity of suspension bridge girder end under moving loads were derived, and the longitudinal displacement response law of suspension bridge girder end under moving loads was studied adopting equivalent longitudinal load. Taking a certain long-span suspension bridge as an example, the law and influence of its girder end longitudinal displacement under moving vertical load were studied numerically. The results showed that under moving loads, the main girder end has longitudinal forced vibration mainly with the equivalent longitudinal disturbance frequency; when load moving speed is smaller, the main girder end mainly reveals the pseudo-static effect, with increase in load moving speed, its dynamic effect is enhanced; structural damping, damper and bearing friction can suppress girder end longitudinal displacement, the influence of bearing friction on girder end longitudinal displacement can’t be ignored; setting central buckle can effectively reduce longitudinal cumulative displacement of girder end under moving vehicles, but girder end longitudinal displacement is not very sensitive to the number of central buckles and its own stiffness. Finally, the longitudinal displacement response frequency spectrum for the measured girder end of Aizhai bridge was analyzed. It was shown that the spectral analysis results basically agree well with the numerical analysis ones.

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suspension bridge / moving loads / girder end longitudinal displacement / resonance velocity

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HUANG Guoping, HU Jianhua, HUA Xugang, WANG Lianhua, CUI Jianfeng. Girder end longitudinal displacement mechanism of long-span suspension bridge under moving vehicles[J]. Journal of Vibration and Shock, 2021, 40(19): 107-115

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