高速铁路高低塔斜拉桥抗震性能研究  

The Research on Seismic Performance of High-speed Railway High-low Tower Cable-stayed Bridge

作　　者：王栋 WANG Dong(Anhui Province Wanbei Intercity Fuhuai Railway Co.,Ltd.,Hefei 230601,China)

机构地区：[1]安徽省皖北城际阜淮铁路股份有限公司,合肥230601

出　　处：《铁道标准设计》2022年第10期104-111,共8页Railway Standard Design

摘　　要：为探讨高速铁路高低塔斜拉桥结构体系、固定支座设置位置以及阻尼器参数选取对于结构抗震性能影响,以阜淮高铁跨径(31+73+230+114+40)m高低塔斜拉桥为背景,根据不同结构体系及阻尼器参数建立有限元模型,采用时程分析法对结构内力及位移等目标函数进行地震响应分析。分析结果表明:(1)在高塔设置固定支座的半漂浮体系使高低塔斜拉桥受力更加合理,可以更好地发挥结构的抗震性能;(2)在阻尼常数C=2000~5000 kN/(m/s),阻尼指数α=0.2~0.5范围内,随着C、α增大,结构抗震性能随之增强;(3)结构一阶振型为主梁一阶竖弯+高塔纵向弯曲,该桥在设计地震作用下处于弹性工作状态,在罕遇地震作用下处于基本弹性工作状态,抗震性能满足规范要求。In order to analysis the influence of structural system,restrained bearing location and damper parameter selection on seismic performance of high-speed railway high-low tower cable-stayed bridge,a finite element model is established based on different structural system and damper parameters with reference to the high-low tower cable-stayed bridge with the span of(31+73+230+114+40)m of Fuyang-Huaibei High-speed Railway.The seismic response of structural internal force and displacement is analyzed by using time-history analysis method.The results show that:(1)The semi-floating system with restrained bearing on the high tower makes the force of the high-low tower cable-stayed bridge more reasonable,and the seismic performance of the structure can be better exerted;(2)In the range of damping constant C=2000~5000 kN/(m/s)and damping indexα=0.2~0.5,the seismic performance of the structure increases with the increase of C andα;(3)The first-order vibration mode of the structure is the first-order vertical bending of the main girder and the longitudinal bending of the high tower.The bridge is in elastic state under design earthquake and in basic elastic state under rare earthquake.The seismic performance meets the requirements of the code.

关 键 词：高速铁路 铁路桥 斜拉桥 抗震性能 数值计算 半漂浮体系 

分 类 号：U442.5[建筑科学—桥梁与隧道工程]