摘要
以灌河大桥为工程背景,建立了结构精细有限元模型和多尺度有限元模型,并进行全桥环境振动试验,以获取结构的实测动力特性.基于两阶段响应面方法,分别对多尺度模型与精确有限元模型之间的误差和初步修正后多尺度模型与实际结构之间的误差进行修正,并将修正后结果与实测值进行比较.结果表明:经过两阶段响应面模型修正后的计算结果与实测结果吻合较好,最大频率相对误差不超过8%,模态保证准则MAC值基本在90%以上,说明两阶段响应面方法能够较好地进行多尺度模型修正,保证修正后的模型参数仍然具有其物理意义;修正后的有限元模型可以进一步应用于多尺度损伤识别及损伤预后,服务于桥梁健康监测及安全评估.
Based on the engineering background of the Guanhe Bridge, a composite cable-stayed bridge, the accurate finite element （FE） model and the multi-scale finite element （MFE） model was established. The actual dynamic characteristics is obtained based on the visual inspection and ambient vibration testing. Then based on two-phase response surface methods, the error between the MFE model and the accurate FE model will be updated firstly, and the error between the updated MFE model and the bridge will be updated later and the results between the updated model and the measurements. It can be concluded that the results from the updated MFE model based on the two-phase response surface methods are in good agreement with the measurements, with the maximum error is less than 8% and the values of MAC being above 90%. Which above that the two-phase response surface methods are suitable for MFE model updating, and the parameters of the MFE model still keep their physical significance after updating. It can be used to multi-scale damage detection and multi-scale damage prognosis, and employed for bridge health monitoring and safety evaluation.
出处
《东南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2013年第5期993-999,共7页
Journal of Southeast University：Natural Science Edition
基金
国家自然科学基金资助项目(51178101
51378112)
关键词
多尺度模型
响应面方法
结合梁斜拉桥
有限元模型修正
环境振动试验
multi-scale simulation
response surface method
composite cable-stayed bridge
finiteelement model updating
ambient vibration testing
