基于单自由度简化模型的漂浮体系斜拉桥电涡流阻尼振震双控性能研究  

Research on vibration‑earthquake dual control performance of ECD for cable‑stayed bridges with floating system based on a simplified SDOF model

作　　者：牛华伟[1,2] 徐继祥 鲁家斌 周家刚 何超 陈政清[1,2] NIU Huawei;XU Jixiang;LU Jiabin;ZHOU Jiagang;HE Chao;CHEN Zhengqing(College of Civil Engineering,Hunan University,Changsha 410082,China;State Key Laboratory of Bridge Safety and Resilience,Hunan University,Changsha 410082,China;Jiangsu Sutong Bridge Co.,Ltd.,Nantong 226017,China)

机构地区：[1]湖南大学土木工程学院,湖南长沙410082 [2]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 [3]江苏苏通大桥有限责任公司,江苏南通226017

出　　处：《现代交通与冶金材料》2025年第1期2-8,21,共8页Modern Transportation and Metallurgical Materials

基　　金：国家自然科学基金资助项目(51478181);湖南省科技创新计划资助项目(2023RC1036)。

摘　　要：针对漂浮体系斜拉桥进行振震双控设计时所要面临的复杂建模和参数设计问题,提出了一种纵向运动的简化单自由度模型,并利用加劲梁梁端实测数据对简化模型的合理性进行了验证,最终基于简化单自由度模型对漂浮体系斜拉桥开展电涡流阻尼振震双控研究。结果表明,漂浮体系斜拉桥纵向往复运动的动力特性表现以一阶纵飘模态为主,基于此提出的简化单自由度模型能够合理反映漂浮体系斜拉桥加劲梁在外界动荷载作用下的纵向运动响应,采用简化模型进行漂浮体系斜拉桥纵向运动振震双控设计可以满足工程要求。此外,电涡流阻尼器可以替代液体黏滞阻尼器对漂浮体系斜拉桥进行振震双控,且电涡流阻尼器的控制效果随着阻尼系数的提高呈增长趋势。Aiming at solving the problems of complex modeling and parameter design faced by the vibration-earthquake dual control design of long-span floating system cable-stayed bridge,a simplified single degrees-of-freedom(SDOF)model of longitudinal motion is proposed,and the rationality of the simplified model is verified by the measured data at the end of the stiffening girder.Then,based on the simplified SDOF model,the eddy current damping vibration-earthquake dual control study of floating system cable-stayed bridge is carried out.The results show that the dynamic characteristics of the longi⁃tudinal reciprocating motion of the stiffening girder are dominated by the first-order longitudinal float⁃ing mode.Based on this,the simplified SDOF model can reasonably reflect the longitudinal motion response of the stiffening girder under external dynamic load,and is therefore used to design the vibration-earthquake dual control of the floating system cable-stayed bridge to meet the engineering re⁃quirements.In addition,the eddy current damper can replace the fluid viscous damper to control the vibration-earthquake dual control of the floating system cable-stayed bridge,and the control effect of the eddy current damper increases with the increase of the damping coefficient.

关 键 词：振震双控 斜拉桥 漂浮体系 电涡流阻尼器 

分 类 号：U441.3[建筑科学—桥梁与隧道工程]