摘要
为研究结构健康监测系统在地震作用下大跨度桥梁动力响应分析的应用,依托国内某特大斜拉桥结构健康监测项目,基于结构振动监测模块的地震作用下桥梁的实测响应数据,分析了结构各关键截面上加速度时程曲线特征,借助互相关函数对比了地震作用前后结构固有频率的变化,并利用反应谱法计算了桥址处地震特征下的结构地震响应。结果表明:相比于结构主跨三向振动,墩顶横向振动对地震更为敏感,可作为结构健康监测工作中的主要报警参数;结构监测技术由于可以实时、准确的测量处地震来临时的真实结构响应,可为桥梁工程应急突发事件的分析打下坚实的数据基础。
In order to study the application of structural health monitoring system in dynamic response analysis of long-span Bridges under earthquake action,based on the measured response data of a large cable-stayed bridge under earthquake action and the measured response data of structural vibration monitoring module,the characteristics of acceleration time history curves on key sections of the structure were analyzed.The variation of natural frequency before and after earthquake is calculated by cross-correlation function,and the seismic response of the structure under seismic characteristics is analyzed by response spectrum method.The results show that the lateral vibration of pier top is more sensitive to earthquake than the three-way vibration of main span,and can be used as the main alarm parameter in structural health monitoring.The structure monitoring technology can measure the real structure response when the earthquake comes in real time and accurately,which can lay a solid data foundation for the analysis of emergency events of bridge engineering.
作者
罗利
罗子圣
LUO Li;LUO Zisheng(Guangdong Jiaoke Testing Co.,Ltd.,Guangzhou 510550,China)
出处
《建筑结构》
北大核心
2023年第S01期2122-2126,共5页
Building Structure
关键词
结构健康监测系统
大跨度桥梁
加速度时程曲线
互相关函数
反应谱
structural health monitoring system
long-span bridge
acceleration time history curve
cross-correlation function
response spectrum
