考虑非完整边界条件的新型混合试验方法

Novel hybrid testing method for solving incomplete boundary condition simulation problem is proposed in this proposal by combining the investigation methods of theoretical analysis, experimental validation, and numerical simulation. The measured reaction forces of specimen under incomplete boundary condition are fed back to the numerical substructure for the calculation of next integration step in traditional hybrid testing method; while in the proposed novel method, the calculated reaction forces of experimental substructure based on model updating under complete boundary condition simulation, instead of the measured forces, are applied for the calculation of next integration step. Firstly, novel hybrid testing method is proposed for solving accuracy problem induced by incomplete boundary condition simulation. Secondly, the unscented Kalman filter online model identification method for complicated specimen and the high-accuracy force-displacement mixed control method are investigated for improving the accuracy of the proposed method. Lastly, the proposed method is validated by one reinforced concrete frame structure with BRB. The proposed novel hybrid testing method provides reliable and economical testing support for the investigation on dynamic damage behavior of engineering structures. The research results of this proposal will have broad application prospects in many fields, including buildings, bridges, and platform structures.

采用理论分析、试验研究与数值模拟相结合的研究手段，研究考虑非完整边界条件的新型混合试验方法，以解决非完整边界条件模拟导致试验误差问题，为揭示工程结构抗震性能提供新型试验技术支撑。该方法不直接将简化边界条件加载下实测的试件反力反馈给数值子结构作为试验子结构的反力，而是利用实测的试件变形和反力信息在线识别模型参数，并通过基于模型更新的精细化数值模拟在线计算试验子结构在完整边界条件下的受力状态，并将计算获得反力作为试验子结构反力。首先，提出考虑非完整边界条件的新型混合试验方法，研究实施方案；然后，研究基于隐形卡尔曼滤波器的复杂模型在线识别更新方法、高精度冗余作动器力-位移混合控制方法，以提高新方法精度；最后，通过防屈曲支撑钢筋混凝土框架结构试验验证所提新方法的有效性。此项目对于客观真实地揭示结构的抗震性能、降低试验成本具有重要意义，研究成果将在建筑、桥梁、海洋平台等结构具有广阔的应用前景。

采用理论分析、试验研究与数值模拟相结合的研究手段，研究了考虑非完整边界条件的新型混合试验方法，以解决非完整边界条件模拟导致试验误差问题，为揭示工程结构抗震性能提供新型试验技术支撑。该方法不直接将简化边界条件加载下实测的试件反力反馈给数值子结构作为试验子结构的反力，而是利用实测的试件变形和反力信息在线识别模型参数，并通过基于模型更新的精细化数值模拟在线计算试验子结构在完整边界条件下的受力状态，并将计算获得反力作为试验子结构反力。首先，提出了考虑非完整边界条件的新型混合试验方法，提出了实施方案；然后，研究了基于隐形卡尔曼滤波器的复杂模型在线识别更新方法、高精度冗余作动器力-位移混合控制方法，提高了新方法精度；最后，通过防屈曲支撑框架结构和装配式钢筋混凝土剪力墙结构等试验验证了所提新方法的有效性。此项目对于客观真实地揭示结构的抗震性能、降低试验成本具有重要意义，研究成果将在建筑、桥梁、海洋平台等结构具有广阔的应用前景。