摘要
高速铁路大跨度桥梁健康监测已逐渐成为保障结构安全的重要手段。运营阶段结构相应受到各种因素的干扰,监测数据中参杂各种响应,很难采用单一要素进行评估。结构所处环境温度周而复始的变化,也会给结构带来不同程度的响应。本文结合某高速铁路三塔斜拉桥健康监测设计,研究中塔塔墩梁固结、边塔塔梁固结体系健康监测应力、梁端纵向位移、梁端转角、索力指标受季节温差、局部温差、索梁温差、非线性温差荷载影响的敏感性,根据不同温度模式,对结构响应敏感性进行评估。研究表明:主梁应力受非线性温差影响较大,索梁温差对索力影响最为敏感,季节温差对梁端伸缩影响最大,季节温差和构件温差对结构的影响较大。可将截面非线性温差-应力、索梁温差-索力、季节温差-梁端纵向位移、索梁温差-梁端转角作为重点监测的对象。
The health monitoring of high-speed railway long-span bridges has gradually become an important method to ensure structural safety.The structure of using stage is disturbed by different factors,and the monitoring data are mixed with various responses,so it is difficult to evaluate by a single factor.The cyclic variation of the ambient temperature in which the structure is located will also bring different degrees of response to the structure.In this paper,based on the health monitoring system of a high-speed railway three-tower cable-stayed bridge which middle tower pier beam consolidation and side tower beam consolidation,the sensitivity of health monitoring stress,beam end longitudinal displacement,beam end rotation angle,cable force index affected by seasonal difference in temperature,sunshine difference in temperature,difference in temperature between cable and beam,nonlinear difference in temperature load is studied,the sensitivity of structural response is evaluated according to different temperature models.The research results show that the stress of main girder is greatly affected by nonlinear difference in temperature,the difference in temperature between cable and beam is the most sensitive to the influence of cable force,the seasonal difference in temperature has the greatest influence on the extension of beam end,and the seasonal difference in temperature and the component difference in temperature have a great influence on the structure.Non-linear difference in temperature-stress,difference in temperature between cable and beam-cable force,difference in temperature between season and longitudinal displacement of beam end,difference in temperature between cable and beam and corner of beam end can be taken as the main monitoring objects.
作者
陈经伟
CHEN Jingwei(China Railway Shanghai Design Institute Group Corporation Limited,Shanghai 200070,China)
出处
《铁道建筑技术》
2023年第9期47-50,73,共5页
Railway Construction Technology
基金
中国国家铁路集团有限公司科技研究开发计划项目(N2022G065)。
关键词
高速铁路
三塔斜拉桥
温度
敏感性
high-speed railway
three-tower cable-stayed bridge
temperature
sensitivity
