动水压力对高烈度区大跨度悬索桥阻尼减震性能的影响  

Influence of Hydrodynamic Pressure on Damping Seismic Performance of Long-span Suspension Bridge in High Intensity Seismic Region

作　　者：郑成成 陈永祁[2] 郑久建[3] ZHENG Chengcheng;CHEN Yongqi;ZHENG Jiujian(Beijing Key Lab of Earthquake Engineering and Structural Retrofit,Beijing University of Technology,Beijing 100124,China;Beijing Qitai Shock Control and Scientific Development Co.,Ltd.,Beijing 100037,China;School of Civil Engineering and Mechanics,Yanshan University,Qinhuangdao 066004,China)

机构地区：[1]北京工业大学工程抗震与结构诊治北京市重点试验室,北京100124 [2]北京奇太振控科技发展有限公司,北京100037 [3]燕山大学建筑工程与力学学院,河北秦皇岛066004

出　　处：《铁道标准设计》2023年第8期112-120,共9页Railway Standard Design

基　　金：河北省自然科学基金项目(E2019203413);河北省教育厅项目(ZD2019096)。

摘　　要：强烈地震在使桥梁产生较大结构响应的同时,会引起结构与周围水体发生相互作用而产生较大的动水压力。以某库区深水大跨度悬索桥为研究对象,在塔梁间设置纵向黏滞阻尼器进行结构减震,以附加质量的方式考虑水与桥塔的相互作用并采用解析法计算。通过建立4种不同结构体系的分析模型,研究动水压力对大跨度悬索桥地震响应及阻尼器减震性能的影响。结果表明:动水压力进一步扩大了悬索桥在地震作用下的结构位移和内力响应,且桥塔浸水深度越大,增强效果越明显;黏滞阻尼器可通过附加抗震阻尼的形式减小悬索桥的纵向位移和结构内力,但受地震动水压力的影响,阻尼器的工作滞回面积增大,阻尼力最大增幅达2.21%,位移最大增幅达8.33%。因此,深水桥梁在采用黏滞阻尼器减震时,应考虑地震动水压力对其性能的影响,以免发生超限破坏。Strong earthquake can cause larger structural response of bridge,resulting in the interaction between structures and the surrounding water to generate hydrodynamic pressure.Taking a deep-water long-span suspension bridge in a reservoir area as the research object,longitudinal viscous dampers are set between the towers and beams for structural shock absorption,the interaction of water and the bridge tower is considered in the form of additional mass and calculated using the analytical method.By establishing four different structural system analysis models,the effects of hydrodynamic pressure on the earthquake response of long-span suspension bridge and the aseismic performance of damper are studied.The results show that the hydrodynamic pressure further enlarges the structural displacement and internal force response of the suspension bridge under the earthquake.The greater the depth of the bridge tower into the water,the more obvious of enhancement effect.The viscous damper can reduce the longitudinal displacement and structural internal force of the suspension bridge in the form of additional anti-seismic damping.However,under the influence of the seismic hydrodynamic pressure,the working hysteresis area of the damper increases,the maximum increase of damping force is 2.21%,and the maximum increase of displacement is 8.33%.Therefore,when viscous damper is adopted for deep-water bridge,the influence of seismic hydrodynamic pressure on its performance should be considered so as to avoid over-limit damage.

关 键 词：深水桥梁 大跨度悬索桥 高烈度地震区 黏滞阻尼器 动水压力 减震性能 

分 类 号：U24[交通运输工程—道路与铁道工程] U448.25[建筑科学—桥梁与隧道工程] U442.5