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首页> 外文期刊>Tunnelling and underground space technology >Validation of a numerical model based on dynamic centrifuge tests and studies on the earthquake damage mechanism of underground frame structures
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Validation of a numerical model based on dynamic centrifuge tests and studies on the earthquake damage mechanism of underground frame structures

机译：基于动态离心试验的数值模型的验证及地下框架结构地震损伤机制研究

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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.
机译：进行一系列动态离心机测试，以分析地下框架结构的地震反应和故障机制。在模型测试中，模型结构经历了完全的崩溃，这很少在以前的研究中报告。本研究旨在基于物理测试获得有效的数值模型，可以正确模拟大变形甚至在地震荷载下的土结构系统的崩溃。考虑到材料的非线性性质和接触的非线性性质，通过全动态时间历史分析进行数值分析测试。制定了建立数值模型的过程和确定材料参数的方法。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，校准的数值模型用于对地下结构的地震损伤反应和失效机制（即，崩溃损伤）进行进一步的研究。基于模型测试和数值结果的最重要的见解中的一些如下。地下框架结构柱的顶部和底部被确定为地震负载条件下的最弱位置，并且易于弯曲剪切失效。垂直地震载荷可以显着增加柱上的轴向力，然后降低水平变形容量。经过高轴向压缩的柱易于在相对强大的水平地震载荷下完成脆性故障，并导致地下框架结构的整体塌陷。因此，只要柱子没有损坏并且提供足够的垂直载体，地下框架结构就可以避免在强烈的地震载荷下完全坍塌。

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