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首页> 外文会议>International conference on structural mechanics in reactor technology >'CHESHIRE CAT' EFFECT IN SSI ANALYSIS PERFORMED BY SASSI
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'CHESHIRE CAT' EFFECT IN SSI ANALYSIS PERFORMED BY SASSI

机译：“柴郡猫”在Sassi进行的SSI分析中效果

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SASSI code is a kind of industrial standard in soil-structure interaction (SSI) analysis. However, it also has some shortcomings. The author came across one of them: the procedure of outcropping is modeled approximately, and certain error arises from different approaches to the dynamic stiffness matrix of one and the same nodal system a) in the initial infinite soil media and b) later on in the finite "outcropped" volume of the same initial soil. As a result, the "internal" nodes in the outcropped volume after the procedure of outcropping are still linked by some "artificial" stiffness matrix, though physically they should not be linked at all. So, in some sense the presence of the initial soil stays in this volume even after this soil goes - that is why the author called it "Cheshire Cat Effect". Naturally, this "artificial" stiffness is proportional to the actual stiffness of the initial soil. After a new soil fills the outcropped volume, "true" stiffness matrix of this soil is added to the "artificial" stiffness matrix mentioned above. If a new soil is more or less comparable to the old one in terms of stiffness, "artificial" matrix does not spoil "true" stiffness matrix, and the results in terms of integral impedances are reasonable. However, if hard soil is substituted with soft soil, the "Cheshire Cat Effect" leads to the unacceptable errors in terms of integral impedances. The author discusses a sample from practice, demonstrating this effect. The combined asymptotic method (CAM) requiring the integral impedances made it possible to discover it. Then the author proposes the way to address the problem: soft part must be included into the initial soil model, and hard lateral walls must be a part of "structure" in terms of SASSI.
机译：Sassi Code是土壤结构相互作用（SSI）分析的一种工业标准。但是，它也有一些缺点。作者遇到了其中一个：露天平的程序大约是建模的，并且某些错误出现在初始无限土壤介质和B）中的初始无限土壤介质和B）中的不同方法。有限的“露面”相同初始土壤的体积。结果，除了露节度的过程之后的外折叠体积中的“内部”节点仍然被一些“人工”刚度矩阵连接，但物理上它们根本不应该链接。因此，在某种意义上，即使在这种土壤中，也存在初始土壤的存在即使在这种土壤之后 - 这就是为什么作者称之为“柴郡猫效应”的原因。当然，这种“人工”刚度与初始土壤的实际刚度成比例。在新的土壤填充外剥离的体积之后，将该土壤的“真实”刚度基质添加到上述“人工”刚度基质中。如果在刚度方面的旧土壤上或多或少可比较，则“人工”基质不会破坏“真实”刚度矩阵，并且整体阻抗的结果是合理的。但是，如果硬土被软土代替，则“柴郡猫效应”导致整体阻抗的不可接受的误差。作者从练习中讨论了一个样本，证明了这种效果。需要整体阻抗的组合渐近方法（CAM）使得可以发现它。然后，提议提出解决问题的方法：软件件必须包含在初始土壤模型中，并且硬侧壁必须是Sassi方面的一部分“结构”。

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