Abstract A series of dynamic centrifuge tests were performed to analyse the seismic response and failure mechanism of the underground frame structures. In the model test, the model structure experienced complete collapse, which has rarely been reported in previous studies. This study aimed to obtain an effective numerical model based on physical tests that could properly simulate large deformations or even the collapse of soil-structure systems under earthquake loads. The tests were numerically analysed via a full dynamic time history analysis considering the non-linear properties of the material and contact. The process of establishing numerical model and the method of determining material parameters were elaborated. The numerical results were compared to experimental data to validate the effectiveness of the numerical model. Finally, the calibrated numerical model was used to carry out further research on the seismic damage response and failure mechanism (i.e., collapse damage) of underground structures. Some of most important insights based on the model test and numerical results are as follows. The top and bottom of the column of underground frame structure were determined to be the weakest positions under earthquake loading conditions and were vulnerable to bending-shearing failure. The vertical earthquake load could significantly increase the axial forces on the columns and then reduce their horizontal deformation capacity. The columns subjected to high axial compression were prone to complete brittle failure under a relatively strong horizontal earthquake load and caused the overall collapse of the underground frame structure. Therefore, the underground frame structure could avoid complete collapse under a strong earthquake load as long as the column was free from damage and provided sufficient vertical support.

中文翻译：

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基于动态离心试验的数值模型验证和地下框架结构地震破坏机制研究

摘要 进行了一系列动态离心试验，分析了地下框架结构的地震反应和破坏机制。在模型试验中，模型结构完全坍塌，这在以往的研究中很少见。本研究旨在获得一个基于物理试验的有效数值模型，可以正确模拟地震荷载作用下土结构系统的大变形甚至倒塌。考虑到材料和接触的非线性特性，通过全动态时程分析对测试进行了数值分析。阐述了数值模型的建立过程和材料参数的确定方法。将数值结果与实验数据进行比较，以验证数值模型的有效性。最后，利用校准后的数值模型对地下结构的地震破坏响应和破坏机制（即倒塌破坏）进行了进一步的研究。基于模型测试和数值结果的一些最重要的见解如下。地下框架结构柱的顶部和底部被确定为地震荷载条件下最薄弱的位置，容易发生弯剪破坏。竖向地震荷载会显着增加柱上的轴向力，进而降低其水平变形能力。承受高轴压的柱子在较强的水平地震荷载作用下容易发生完全脆性破坏，导致地下框架结构整体倒塌。所以，