粘滞阻尼器对钢桁梁斜拉桥纵向振动响应的影响分析  

Analysis on Impact of Viscous Damper on Longitudinal Vibration Response of Steel Truss Girder Cable-stayed Bridge

作　　者：袁立平[1] 许智焰[1] 

机构地区：[1]中铁二院工程集团有限责任公司,成都610031

出　　处：《高速铁路技术》2015年第2期51-55,共5页High Speed Railway Technology

摘　　要：桂平郁江特大桥是南宁至广州铁路的重点工程之一,位于西江航运干线贵港至桂平河段,跨郁江主桥为(36+96+228+96+36)m五跨连续钢桁斜拉桥。设计速度250 km/h,为有砟轨道双线桥梁。由于桂平郁江钢桁斜拉桥的主梁和桥塔间采用纵向无约束的漂浮体系,列车制动及地震会引起主梁纵向较大的振动位移和桥塔根部较大的纵向弯矩,影响桥梁的正常使用和安全。文章以桂平郁江钢桁斜拉桥为例,对钢桁梁斜拉桥在列车制动力和地震作用下,粘滞阻尼器对结构振动响应的影响进行了详细的分析,结果表明:粘滞阻尼器能显著减小列车制动及地震作用下主塔塔顶位移及主梁位移,具有较好的减振效果;粘滞阻尼器能较好控制结构在塔梁连接处的内力,特别对主塔控制截面的弯矩及剪力改善较为明显,能够保证大桥的正常运行和安全。Guiping Yujiang River super major bridge is one of the key projects of Nanning Guangzhou railway, located in Guigang-Guiping reach of Xijiang shipping route. The main bridge crossing Yujiang River is a （36 ＋96 ＋228 ＋96 ＋36） m five span continuous steel trussed cable-stayed bridge. It’s a ballasted double track bridge with the design speed of 250 km/h. As the longitudinal unconstrained floating system is used between the girder and bridge tower of Yujiang steel truss cable-stayed bridge, train braking and earthquake will cause large longitudinal vibration displacement of gird-er and larger longitudinal bending moment of tower root, which shall have influence on normal operation and safety of the bridge. This paper takes Guiping Yujiang steel trussed cable-stayed bridge as an example, under the action of train bra-king force and earthquake, the influence of viscous damper on the structural vibration response is analyzed in detail, the results show that the viscous damper can markedly reduce the pylon top displacement and the girder displacement, hav-ing better damping effect;preferably control the internal force at joint of tower and girder, especially improve the ben-ding moment and shearing force of control section of the main tower, ensure the normal operation and safety of the bridge.

关 键 词：高速铁路 钢桁梁 斜拉桥 粘滞阻尼器 

分 类 号：U441.3[建筑科学—桥梁与隧道工程]