Dynamic response analysis of long-span arch bridge under near-fault pulse seismic motion

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Journal of Vibration and Shock ›› 2024, Vol. 43 ›› Issue (9) : 94-104.

XU Lueqin1,2, YUAN Maojun1, ZUO Ying1, SHEN Zhengxuan1, XU Lihan1

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Abstract

To reveal the effects of the characteristics of velocity pulses and pulse parameters on the seismic response of large-span arch bridge under near-fault pulse-type ground motions, the record-decomposition incorporation (RDI) method was first introduced to synthesize artificial near-fault pulse-type ground motions. By comparing the accuracy of different equivalent pulse models, the synthesis method was optimized and validated. Taking a large-span arch bridge as the engineering background, artificial near-fault ground motions with different parameter characteristics were synthesized using the optimized method, and the influence mechanism of pulse components and residual components on the seismic response of the arch bridge was discussed. Finally, the influence of different pulse parameters on the seismic response of the arch bridge was studied. The research results show that the optimized RDI method can effectively simulate the original near-fault pulse-type ground motions and obtain artificial ground motions with different pulse parameters. The high-frequency components of near-fault ground motion records are found to have a significant adverse effect on the seismic response of the arch bridge. As the amplitude of the pulse increases, the effects of forward-directionality and fling-step pulses on the seismic response of the arch bridge are both obviously increased; and when the pulse period increases, both types of pulse effects have significant adverse effects on the seismic response of the arch bridge. With respect to the influence of the pulse number, the near-fault ground motions with bidirectional pulses cause a greater in-plane response of the arch bridge when compared to those with multi-directional pulses.

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long-span arch bridge / near-fault pulse-type ground motions / pulse parameters / record-decomposition incorporation method / seismic response

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XU Lueqin1,2, YUAN Maojun1, ZUO Ying1, SHEN Zhengxuan1, XU Lihan1. Dynamic response analysis of long-span arch bridge under near-fault pulse seismic motion[J]. Journal of Vibration and Shock, 2024, 43(9): 94-104

References

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