剪力键对隔震桥梁地震响应影响分析  

Effect of shear-key on seismic response of isolated bridge

作　　者：王超 裴辉腾 Wang Chao;Pei Hui-teng(Jiangxi Communications Design and Research Institute Co.Ltd,Nanchang 330052,China;School of Civil Engineering,Tongji University,Shanghai 200092,China;Jiangxi Highway Bridge Research Center of Engineering Technology,Nanchang 330052,China)

机构地区：[1]江西省交通设计研究院有限责任公司,江西南昌330052 [2]同济大学土木工程学院,上海200092 [3]江西省公路桥梁工程技术研究中心,江西南昌330052

出　　处：《工程抗震与加固改造》2024年第1期77-82,共6页Earthquake Resistant Engineering and Retrofitting

基　　金：江西省交通运输厅科技项目(2022H0019)。

摘　　要：为了保证隔震桥梁在正常使用状态下的正常工作,需要在摩擦摆支座中设置剪力键,因此有必要研究剪力键对隔震桥梁的影响。以粤东高烈度地区某连续梁桥为背景,建立全桥有限元模型,分析了采用摩擦摆支座的隔震桥梁在E1及E2地震荷载激励下的响应。通过改变摩擦摆支座内剪力键水平承载能力大小,研究了不同剪力键承载能力对隔震桥梁地震响应的影响。研究结果表明,剪力键承载能力对墩底弯矩幅值及墩顶位移幅值影响较大,但对主梁位移幅值及支座幅值影响较小;当剪力键承载能力P与固定支座竖向设计荷载W的比值等于0.08时最优,此时剪力键在E1地震激励下不失效,且在E2地震激励下,对支座减隔震效果影响较小。In order to ensure the function of the isolated bridge under serviceability limit state,it is necessary to set the shear-key in the FPB.Therefore,it is necessary to study the influence of shear-key on isolated bridges.Taking a continuous bridge in the highly seismic region of the eastern Guangdong province as example,the whole bridge finite element model was established.The response of the isolated bridge with FPB under the excitation of E1 and E2 seismic load was analyzed,and the influence of the bearing capacity of shear-key on the seismic response of the bridge was studied by changing the bearing capacity of the shear-key in the support.The results show that the bearing capacity of the shear-key has a great influence on the amplitude of the bending moment at the bottom of pier and displacement at the top of pier,but has litle influence on the displacement amplitude of the main beam and the bearing.When the bearing capacity P of shear-key to the vertical load W of fixed support is equal to O.08,it reaches the optimum,which makes the shear-key not to be invalid in the case of E1 earthquake excitation,and has little influence on the effect of isolation under the E2 earthquake excitation.

关 键 词：摩擦摆支座 剪力键 数值模拟 桥梁减隔震 

分 类 号：U442.5[建筑科学—桥梁与隧道工程]