| 四主缆大跨悬索桥抗震性能分析及减震措施优化 |
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| 引用本文： | 刘志文,?,魏祎博,王连华,丁少凌,谢功元,谢学鑫,陈政清. 四主缆大跨悬索桥抗震性能分析及减震措施优化[J]. 湖南大学学报(自然科学版), 2024, 0(3): 8-19 |
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| 作者姓名： | 刘志文 ? 魏祎博 王连华 丁少凌 谢功元 谢学鑫 陈政清 |
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| 作者单位： | （1.湖南大学 桥梁工程安全与韧性全国重点实验室，湖南 长沙 410082；2.湖南大学 风工程与桥梁工程湖南省重点实验室，湖南 长沙 410082；3.湖南大学 土木工程学院，湖南 长沙 410082；4.中交第二公路勘察设计研究院有限公司，湖北 武汉 430212；5.湖北交投宜昌高速公路建设管理有限公司，湖北 宜昌 443000） |
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| 摘 要： | 以燕矶长江大桥为工程背景，首先，采用动力非线性时程法分析了燕矶长江大桥抗震性能，并研究了设置电涡流-摩擦组合型阻尼器和黏滞阻尼器对大跨悬索桥抗震性能的影响；然后，对附加电涡流-摩擦组合型阻尼器摩擦力、阻尼系数和阻尼指数开展了参数敏感性分析；最后，从耗能角度分析地震作用下电涡流-摩擦组合型阻尼器减震特点.结果表明：在E2地震作用下，桥塔关键截面抗弯能力均大于弯矩需求；在“纵向+竖向”地震作用下梁端纵向位移较大.设置塔梁处纵桥向阻尼器后，可有效降低主桥梁端纵向位移；增大摩擦力、阻尼系数与降低阻尼指数均可提升梁端纵向地震响应的控制效果，但参数变化对桥塔控制截面的地震响应影响较小.阻尼系数较大时，电涡流阻尼主导了电涡流-摩擦组合型阻尼器耗能，相较于黏滞阻尼器，电涡流-摩擦组合型阻尼器对梁端纵向位移控制效果更好.
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| 关 键 词： | 四主缆大跨悬索桥；抗震性能；非线性时程分析；黏滞阻尼器；电涡流-摩擦组合型阻尼器 |
Seismic Performance Analysis and Mitigation Measures Optimization of Long-span Suspension Bridge with Four Main Cables |
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| LIU Zhiwen,?,WEI Yibo,WANG Lianhu,DING Shaoling,XIE Gongyuan,XIE Xuexin,CHEN Zhengqing. Seismic Performance Analysis and Mitigation Measures Optimization of Long-span Suspension Bridge with Four Main Cables[J]. Journal of Hunan University(Naturnal Science), 2024, 0(3): 8-19 |
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| Authors: | LIU Zhiwen ? WEI Yibo WANG Lianhu DING Shaoling XIE Gongyuan XIE Xuexin CHEN Zhengqing |
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| Affiliation: | （1.National Key Laboratory of Bridge Safety and Resilience， Hunan university ，Changsha 410082， China；2.Hunan Provincial Key Laboratory for Wind and Bridge Engineering，Hunan University，Changsha 410082，China；3.College of Civil Engineering，Hunan University，Changsha 410082，China；4.CCCC Second Highway Survey， Design and Research Institute Co.， Ltd， Wuhan 430212， China；5.Hubei Communications Investment Yichang Expressway Construction Management Co.， Ltd， Yichang 44300， China） |
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| Abstract: | Taking Yanji Yangtze River Bridge （YJB） as the engineering background， firstly， the seismic performance of YJB is analyzed using the dynamic nonlinear time history method. Moreover， the effects of installing the eddy current-friction combined damper （EC-FCD） and viscous damper （VD） on the seismic performance of the long-span suspension bridge are studied. Furthermore， the parameter sensitivity analysis of the friction force， damping coefficient and damping index of the EC-FCD is carried out， respectively. Finally， from the perspective of energy dissipation， the characteristics of the EC-FCD on the large-span suspension bridge under earthquake are analyzed. The results show that under the E2 earthquakes， the resistance bending moment of key sections of the pylons is greater than the demand bending moment， and the longitudinal displacement of the stiffened girder end is relatively large under the longitudinal and vertical earthquakes. The longitudinal displacement of the stiffened girder end can be effectively reduced by installing longitudinal dampers at the interaction of pylon and girder. Moreover， increasing friction and damping coefficient， as well as decreasing damping index can improve the control effect of longitudinal displacement at the stiffened girder end. However， changing these parameters has little effect on the seismic response of the key sections of the pylons. When the damping coefficient is large， eddy current damping dominates the energy dissipation of the EC-FCD. Compared with the VD， the EC-FCD has a better control effect on the longitudinal displacements of the stiffened girder ends. |
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| Keywords: | long-span suspension bridge with four main cables；seismic performance；nonlinear time-history analysis；fluid viscous damper；the eddy current-friction combined damper |
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