Traditional modeling approaches are difficult to reflect the slight changes of bridge system param-eters and responses.Due to this,digital twins are adopted as the high fidelity mapping models for a bridge sys-tem.Firstly,the definition of digital twins comprises three parts of a physical twin layer,a digital twin layer and an information interaction medium.The digital twin model inside the digital twin layer is the virtual mapping of the bridge physical entity,and the real-time information transmission between the two layers is achieved by the information interaction medium.Secondly,in view of practical applications,three modeling principles of struc-tural informatization,information digitization and data modelization are proposed to realize the informatization and visualization of the bridge physical entity.Thereby,the digital twin model with high fidelity is established for the cable-stayed bridge.Lastly,the monitoring data of a back-stay cable of an actual bridge are adopted as the perceptual information,and the changed cable parameters are fed to the digital twin model for twin model up-dating and response prediction.The analyses results demonstrate that the proposed digital twin modeling method can effectively reflect the parameter changes of the actual bridge.Then the corresponding slight variations of the cable force,the tower top deviation and the mid-span deflection of the main girder are predicted by the twin model.
关键词
斜拉桥/数字孪生体/建模框架和准则/孪生模型更新/信息交互媒介
Key words
cable-stayed bridge/digital twins/modeling framework and principles/twin model updating/infor-mation interaction media
维普
万方数据