桥隧相连超高墩连续梁桥纵向弹性地震响应特性研究  

Longitudinal elastic seismic response characteristics of super-high pier continuous girder bridges connected with tunnels

作　　者：陈盈[1] 张乐 张文学[1] 田雨毫 CHEN Ying;ZHANG Le;ZHANG Wen-xue;TIANYu-hao(College of Architecture and Civil Engineering,Beijing University of Technology,Beijing 100124,China)

机构地区：[1]北京工业大学建筑工程学院,北京100124

出　　处：《振动工程学报》2020年第5期1024-1034,共11页Journal of Vibration Engineering

基　　金：国家自然科学基金资助项目(51778022);北京市自然科学基金资助项目(8172008)。

摘　　要：为研究桥隧相连超高墩连续梁桥的纵向弹性地震响应特性,以某山区桥隧相连三跨连续梁桥为背景,建立碰撞分析模型,研究其纵向弹性地震响应特性,并与常规连续梁桥纵向弹性地震响应进行对比;分析了场地类型、墩高、伸缩缝间隙、滑动支座摩擦系数等因素对桥隧相连超高墩连续梁桥纵向弹性地震响应特性的影响,讨论了伸缩缝处设置橡胶缓冲装置的减震效果。研究表明:与带引桥超高墩连续梁桥相比,碰撞效应对桥隧相连超高墩连续梁桥的纵向弹性地震响应的影响更加显著;桥隧相连超高墩连续梁桥随着墩高的增加固定墩弯矩响应沿墩高出现多个极值点,固定墩墩顶剪力响应明显增加,甚至超过墩底剪力。场地类型和伸缩缝间隙均对桥隧相连超高墩连续梁桥纵向弹性地震响应有较大影响;增大滑动支座摩擦系数对超高墩连续梁桥墩底内力响应基本无影响;在伸缩缝处设置橡胶缓冲装置可以明显降低其地震响应。In order to study the longitudinal elastic response characteristics of super-high pier continuous girder bridges connected with tunnels,the model of seismic analysis is established by taking a three-span continuous girder bridge connected with tunnels in a mountainous area as an example.Moreover,it is compared with the longitudinal elastic response of conventional continuous girder bridge.The influence factors such as site type,pier height and expansion joint gap of super-high pier continuous girder bridges are analyzed.The shock absorption effect of rubber buffer device at the expansion joint is also discussed.The results show that the impact of the collision on super-high pier continuous girder bridge connected with tunnel is more significant compared the super-high pier continuous girder bridge with approach bridge.With the increase of the height of pier,the bending moment responses of fixed piers of super high-pier continuous girder bridges connected with tunnel appear multiple extreme points along pier body.The maximum shear response may appear on the top of pier.Site type and expansion joints gap have a great influence on them.Increasing the friction factor of movable support has little effect on the internal force response at the bottom of pier of super-high pier continuous beam bridge,but it is possible to increase the shear response and impact force response at the top of pier.Rubber buffer device could significantly reduce the seismic response of continuous girder bridges connected with tunnels.

关 键 词：纵向地震响应 桥隧相连 连续梁桥 超高墩 碰撞 

分 类 号：U442.55[建筑科学—桥梁与隧道工程]