不同地震激励下大跨度独塔斜拉桥减震控制研究  

Research on Seismic Response Control for a Long-span Simple-tower Cable-stayed Bridge under Various Earthquake Excitations

作　　者：丁兰[1] 张谢东[1] 朱伟伟[1] 

机构地区：[1]武汉理工大学交通学院,湖北武汉430063

出　　处：《工程抗震与加固改造》2013年第3期77-82,共6页Earthquake Resistant Engineering and Retrofitting

摘　　要：以一座大跨度独塔斜拉桥为例,建立其有限元模型,利用时程分析法计算分析了弹性连接装置和阻尼器对大跨度独塔斜拉桥的减震效果,并着重分析了不同地震动特性(频谱特性和加速度峰值)对大跨度独塔斜拉桥减震效果的影响。分析表明,只要合理选取参数,在塔梁间设置弹性连接装置或阻尼器均能有效地控制梁端的地震位移和塔底的弯矩;不同地震动特性显著影响了两种装置的减震效果。Vibration-suppressing effectiveness of the elastic link devices and the dampers for a long-span simple-tower cable-stayed bridge is calculated and analyzed through time-history analysis with its finite element model. The emphasis is placed on the influence of spectrum shape and peak acceleration of earthquake excitations. The investigation indicates that both the elastic link devices and the dampers with rational parameters may reduce the seismic displacement of the deck and the bending moment at the bottom of the tower significantly. Various earthquake excitations evidently influence the vibration-suppressing effectiveness of the two control devices.

关 键 词：大跨度独塔斜拉桥 减震效果 弹性连接装置 阻尼器 不同地震动特性 

分 类 号：U442.55[建筑科学—桥梁与隧道工程]