超大跨度悬索桥主缆自平衡体系运营期控制  

Control of Main Cable Self⁃balancing System in Super⁃long Span Suspension Bridge During Operational State

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作  者:阮静 王仁贵[2] 魏乐永[2] 颜智法 陈智 封周权[3,4] RUAN Jing;WANG Rengui;WEI Leyong;YAN Zhifa;CHEN Zhi;FENG Zhouquan(Jiangsu Provincial Transportation Engineering Construction Bureau,Nanjing 210004,China;CCCC Highway Consultants Co.Ltd.,Beijing 100010,China;Hunan Provincial Key Laboratory of Wind and Bridge Engineering,Hunan University,Changsha 410082,China;State Key Laboratory of Bridge Safety and Resilience,Hunan University,Changsha 410082,China)

机构地区:[1]江苏省交通工程建设局,南京210004 [2]中交公路规划设计院有限公司,北京100010 [3]湖南大学风工程与桥梁工程湖南省重点实验室,长沙410082 [4]湖南大学桥梁工程安全与韧性全国重点实验室,长沙410082

出  处:《铁道建筑》2024年第11期75-82,共8页Railway Engineering

基  金:湖南省自然科学基金(2021JJ30106);重庆市自然科学基金(CSTB2022NSCQ-MSX1465)。

摘  要:超大跨度悬索桥塔顶两侧的主缆往往会形成巨大的不平衡水平力,这给主塔设计带来了很大的挑战。为抑制运营阶段索鞍频繁的纵向微动位移并减小桥塔受力,本文以在建超大跨度悬索桥为例,提出一种具有振震双控功能的主缆自平衡体系。建立大桥动力分析模型分析大桥在风车联合作用下的动力响应特征,研究主缆自平衡体系对纵向运动的控制效果,并对比缆塔自由、缆塔固结和自平衡三种结构体系下的纵向响应,对大桥的抗震性能和静力性能进行检验与分析。结果表明:自平衡体系可以有效抑制索鞍位移,位移峰值、累积值的减振率分别达到60%、95%,E2地震作用下索鞍位移峰值的减震率达到79%,塔底截面的能力需求比为9,满足承载力要求,且改善了桥塔受力,避免混凝土受拉,有利于降低造价。主缆自平衡体系的综合性能优越,可以有效保障桥梁的正常运营和安全耐久。The main cables on both sides of the tower top of super-long span suspension bridges often create significant unbalanced horizontal forces,posing considerable challenges for the design of the main towers.To suppress the frequent longitudinal micro-movements of the saddle during the operational state of super-long span suspension bridges and to reduce the stress on the bridge towers,taking a currently under-construction super-long span suspension bridge as an example,this paper proposed a self-balancing system for the main cables with dual vibration and seismic control functions.A dynamic analysis model of the bridge was established to analyze the dynamic response characteristics of the bridge under the combined action of wind and traffic loads,study the control effect of the main cable self-balancing system on longitudinal motion,and compare the longitudinal response under three structural systems of tower-cable free,tower-cable fixed,and self-balancing.The seismic and static performance of the bridge were tested and analyzed.The results show that the self-balancing system can effectively suppress the displacement of the cable saddle,and the damping rate of the peak and cumulative values of the displacement reaches 60%and 95%,respectively.The damping rate of the peak displacement of the cable saddle under the action of the E2 earthquake reaches 79%,and the ratio of the capacity demand of the tower bottom cross-section is 9 to meet the requirements of the load carrying capacity,and it improves the stress state of bridge tower to avoid the tension of concrete,which is conducive to reducing the cost.The comprehensive performance of the main cable self-balancing system is superior,which can effectively ensure the normal operation and safety durability of the bridge.

关 键 词:公路桥梁 大跨度悬索桥 数值计算 运营状态 黏滞阻尼器 

分 类 号:U448.25[建筑科学—桥梁与隧道工程]

 

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