Multiscale method for long tunnels subjected to seismic loading
Multiscale method for long tunnels subjected to seismic loading
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DOI：
10.1002/nag.1102
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发表时间：
2013-03
影响因子：
4
通讯作者：
Haitao Yu;Yong Yuan;A. Bobet
中科院分区：
文献类型：
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作者：
Haitao Yu;Yong Yuan;A. Bobet
提出了一种用于地下结构动力分析的多尺度方法，该方法采用粗细两种尺度的有限元网格对整个区域进行并行离散。粗尺度网格用于捕捉整体体系的地震反应特征，而细尺度网格则详细描述潜在损伤或感兴趣位置的动力响应。对于粗细尺度网格的重叠，引入了桥接尺度项，从而加强了粗细尺度模型之间的动力学行为的兼容性。在多尺度模型中同时考虑了材料和接触的非线性。作为应用，将该模型用于某新建长距离盾构隧道的大尺度地震反应分析。结果表明，这种多尺度方法在细/粗界面上不存在杂波反射，不需要进行滤波处理，这与位移耦合方法相比具有明显的优势。在细比例尺模型中，对衬砌管片及其连接螺栓的应力和变形响应进行了研究和分析，并对关键结构部件如螺栓和接头的承载能力进行了评估。版权所有©2011 John Wiley&Sons，Ltd.
A multiscale method for the dynamic analysis of underground structures is proposed, which involves the concurrent discretization of the entire domain with both coarse‐scale and fine‐scale finite element meshes. The coarse‐scale mesh is employed to capture seismic response characteristics of the integral system, whereas the fine‐scale mesh describes in detail the dynamic response in positions of potential damage or interest. For both the coarse‐scale and fine‐scale meshes to overlap, a bridging scale term is introduced so that compatibility of dynamic behavior between the coarse‐ and fine‐scale models is enforced. Both material and contact nonlinearities are considered in the multiscale model. As an application, the model is used for large‐scale seismic response of a newly built long‐distance shield tunnel. Results show that this multiscale method does not have spurious wave reflections at the fine/coarse interface and does not need filtering procedures, which is an advantage compared with the displacement coupling method. Stress and deformation response in lining segments and their connecting bolts are investigated and analyzed within the fine‐scale model, and the capacity of critical structural components, such as bolts and joints is evaluated. Copyright © 2011 John Wiley & Sons, Ltd.