摘要
平潭安海澳大桥位于7度设防区,首次采用由5根部分填充钢管混凝土塔柱组成的扇形主塔。为了确保大桥安全顺利建设,开展了抗震性能分析。结果表明:主桥振动模态以桥塔的振动为主;扇形主塔纵桥向刚度较小,强震作用下主塔塔顶的纵桥向位移响应约为横桥向响应的1.92倍;相比E1地震作用,E2地震作用下主塔塔顶纵桥向和横桥向位移响应,以及塔柱底部钢管应力平均增加了约70%,但主桥各主要部件均处于弹性工作状态,抗震性能良好。
Pingtan Anhai ao Bridge is located in a 7-degree fortified area.For the first time,a fan-shaped main tower composed of 5 partially concrete-filled steel tube tower columns is adopted.In order to ensure the safe and smooth construction of the bridge,the seismic performance analysis of the bridge was carried out.The results show that the vibration modal of the bridge was dominated by the vibration of the main tower.Under the action of strong earthquake,the longitudinal response of the top of the main tower was about 1.92 times that of the transverse response due to its lower longitudinal stiffness.Compared with the E1 earthquake,the longitudinal and transverse displacement responses on the top and the stress of the steel tube at the bottom of the main tower under the E2 earthquake were averagely increased by about 70%.The main components of the main bridge were in an elastic working state,and the seismic performance was good.
作者
张利铨
ZHANG Liquan(Fuzhou Zuohai Holding Group Co.,Ltd.,Fuzhou 350001)
出处
《福建建筑》
2022年第6期88-92,共5页
Fujian Architecture & Construction
基金
福建省交通运输科技项目(202034)
福州市科技计划项目(2019-G-41)。
关键词
部分斜拉桥
部分填充钢管混凝土
扇形主塔
振动模态
抗震性能
Extradosed cable-stayed bridge
Partially filled concrete-filled steel tube
Fan-shaped main tower
Vibration modal
Seismic performance
