动水压下减震连续梁桥随机优化及减震性能研究

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摘要地震作用下，跨海桥梁桥墩和周围水体的动力相互作用将对桥梁结构的动力响应产生较大影响。本文建立了考虑动水压力的2自由度连续梁桥简化分析模型，推导了其组合刚度和附加质量；提出了以墩顶位移方差最小为目标的黏滞阻尼器参数随机优化的Lyapunov方法。在此基础上，通过对设置黏滞阻尼器的某跨海连续梁桥简化模型进行了阻尼器参数优化，研究了动水压力和地震耦合作用下连续梁桥的减震性能。研究结果表明：动水压力增大了桥梁的地震反应，对桥梁的动力响应特性有较大影响。采用黏滞阻尼器可有效减小跨海连续梁桥的地震反应，改善桥梁结构抗震安全性能。

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	马安财1
	谭平2
	王社良1
	周福霖1
	2

关键词 ：连续梁桥, 动水压力, 黏滞阻尼器, 随机振动, 参数优化, 减震性能

Abstract：Under the action of earthquake, the dynamic interaction between the bridge pier and the surrounding water will have a great influence on the dynamic response of the structure. In this paper, a simplified analysis model of a continuous beam bridge with 2 degrees of freedom considering the hydrodynamic pressure is established, and its combined stiffness and additional mass are derived. The Lyapunov method for stochastic optimization of viscous damper parameters with the goal of minimizing the displacement of the pier top is proposed. On this basis, a simplified model of a sea-crossing continuous girder bridge with viscous dampers was optimized for damper parameters, and the seismic mitigation performance of the continuous girder bridge under the coupling of hydrodynamic pressure and earthquake was studied. The results show that the hydrodynamic pressure increases the seismic response of the bridge and have a greater impact on the dynamic response characteristics of the bridge. Seismic response to continuous girder bridges can be effectively reduced by viscous dampers and the seismic safety of the bridge structure are improved significantly.

Key words： continuous girder bridge hydrodynamic pressure viscous damper stochastic vibration Parameter optimization Seismic mitigation performance

收稿日期: 2020-06-17 出版日期: 2021-03-15

引用本文:

马安财1,谭平2,王社良1,周福霖1,2. 动水压下减震连续梁桥随机优化及减震性能研究[J]. 振动与冲击, 2021, 40(5): 163-169.
MA Ancai1, TAN Ping2, WANG Sheliang1, ZHOU Fulin1,2. Stochastic optimization and aseismic performance of continuous girder bridge with viscous dampers under hydrodynamic pressure. JOURNAL OF VIBRATION AND SHOCK, 2021, 40(5): 163-169.

链接本文:

http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2021/V40/I5/163

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