近断层脉冲型地震作用下大跨拱桥动力响应分析

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振动与冲击 ›› 2024, Vol. 43 ›› Issue (9) : 94-104.

论文

徐略勤1,2，袁茂均1，左英1，沈正璇1，徐粒寒1

作者信息 +

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

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

Author information +

文章历史 +

摘要

为了研究近断层脉冲型地震动的速度脉冲特性和参数对大跨拱桥动力响应的影响规律，首先引入分解叠加法（record-decomposition incorporation，RDI）合成人工近断层脉冲型地震动，对比研究了不同等效脉冲模型的准确性，进而优化和验证了合成方法；然后以某大跨拱桥为工程背景，采用优化后的RDI方法合成了具有不同参数特征的人工近断层地震动，探讨了脉冲成分与残余分量对拱桥动力响应的影响机制；最后研究了不同脉冲参数对拱桥动力响应的影响规律。研究表明，优化后的RDI合成方法能有效模拟原始近断层脉冲型地震动，并得到具有不同脉冲参数的人工地震动；近断层地震记录的高频成分对拱桥结构动力响应具有显著的不利影响；随着脉冲幅值的增大，向前方向性效应和滑冲效应对拱桥动力响应的影响均明显增大；随着脉冲周期的增大，两种脉冲效应对拱桥动力响应均有显著的不利影响；对于脉冲个数的影响，双向脉冲的近断层地震动相比多向脉冲会引起拱桥更大的面内响应。

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.

导出引用

徐略勤1,2，袁茂均1，左英1，沈正璇1，徐粒寒1. 近断层脉冲型地震作用下大跨拱桥动力响应分析[J]. 振动与冲击, 2024, 43(9): 94-104

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

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