Difference of Bridge Damping Ratio under Different Excitations

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Journal of Vibration and Shock ›› 2016, Vol. 35 ›› Issue (3) : 62-67.

Li Zhan1 Li Pengfei 1 Jiang Zhenyu 1 Wei Han1

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Abstract

Data on the damping ratios of structure have been collected and analyzed. The limitations on the research of the bridge damping ratio have been pointed out. In order to make up the limitation of the lack of date on the damping ratios of bridges, three bridges damping ratios are tested. The damping ratios of bridges scatter with the influence of the bridge types, excitations, calculation methods of damping ratio and the test environment. With the increase in excitation intensity, the damping ratios of the bridges increase significantly. The damping ratio tested under vehicle excitation is larger than the value tested under ambient excitation. Under the same excitations, the damping ratio calculated by the half-power bandwidth method is more scattered than which calculated by the free decay method. The test of the bridge damping ratio should be carried out under the same excitations to ensure accuracy.

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bridge / damping ratio / excitation / half-power bandwidth method / free decay method

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Li Zhan1 Li Pengfei 1 Jiang Zhenyu 1 Wei Han1. Difference of Bridge Damping Ratio under Different Excitations[J]. Journal of Vibration and Shock, 2016, 35(3): 62-67

References

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