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为了给悬索桥的结构损伤识别和安全监测工作提供了准确的依据,根据马鞍山左汊悬索桥动静力试验获得的实测模态振动数据,采用基于特征灵敏度的优化设计方法对马鞍山大桥左汊悬索桥有限元模型进行修正。对悬索桥有限元模型修正采用分步修正模型策略,并构造了包括频率响应残差、振型响应残差和位移响应残差项在内的多响应目标函数。研究表明,为了建立一个全面反映悬索桥静动力响应的有限元模型,需在目标函数中包含静动力响应残余项,这样修正后的模型不论是在反映原桥频率、振型等动力响应还是位移、索力等静力响应方面都有着较高的精度。研究结果为大跨度缆索支撑桥梁结构的有限元模型修正提供参考。
In order to provide an accurate basis for the structural damage identification and safety monitoring of suspension bridges, according to the measured modal vibration data obtained from the static and static tests of the Suspension Bridge at Ma On Shan, the optimization design method based on characteristic sensitivity is adopted to analyze the finite element model Correct. The method of stepwise correction model was adopted to correct the finite element model of suspension bridge, and a multi-response objective function including frequency response residuals, modal response residuals and displacement response residuals was constructed. The research shows that in order to establish a finite element model that fully reflects the static and dynamic response of the suspension bridge, the residuals of the static and dynamic responses need to be included in the objective function. In this way, the modified model reflects the dynamic response or displacement of the original bridge frequency, Cable and other static response has a higher accuracy. The results provide references for the revision of the finite element model of long-span cable-stayed bridges.