河北工业科技2024，Vol.41Issue(4)：273-281,9.DOI:10.7535/hbgykj.2024yx04005
基于实测频率振型的大跨斜拉桥响应面模型修正研究
Response surface model modification of long-span cable-stayed bridges based on measured frequency mode
摘要
Abstract
In order to verify the accuracy and feasibility of the response surface model correction method based on the measured frequency and mode shape,the static load test and the modal test under environmental excitation were carried out with a long-span cable-stayed bridge as the engineering background.Using vertically measured frequencies and modes as state variables for the fourth-order forward experiment,appropriate correction parameters were selected to conduct a central composite experimental design.The response surface model considering the interaction term was used for data fitting,and the R2 value of the parameter range was calculated for accuracy testing.The change rate of frequency and mode shape was analyzed,and the deflection of the modified model was compared with the measured deflection to verify the accuracy of the model.The results show that in the parameter range,the R2 values of each response surface model are close to one,indicating high fitting accuracy.The frequencies and vibration mode of the modified model closely match the measured values,which can accurately reflect the dynamic characteristics of the bridge.The maximum error between the calculated deflection value and the measured value of the modified model is less than 7.98%,which meets the requirements of the engineering accuracy,and it can realistically reflect the working state of the large-span cable-stayed bridge.The study proves the applicability and feasibility of the response surface model correction method based on the measured frequencies and vibration modes for large-span cable-stayed bridges,which can provide a reference for the model correction of similar bridges in practical engineering.关键词
桥涵工程/大跨斜拉桥/动力参数/响应面法/有限元模型修正/静载试验Key words
bridge and culvert engineering/long-span cable-stayed bridge/power parameters/response surface method/finite element model modification/static load test分类
交通工程引用本文复制引用
李明星,佀贞贞,亓兴军,曹三鹏,杨洪超..基于实测频率振型的大跨斜拉桥响应面模型修正研究[J].河北工业科技,2024,41(4):273-281,9.基金项目
山东省交通运输厅科技计划项目(2022B06) （2022B06）
山东省企业技术创新项目(202250101726,202160101415) （202250101726,202160101415）
