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Nonlinear Dynamic Response of Concrete Structure with Soil-Structure Interaction

机译：土-结构相互作用的混凝土结构非线性动力响应

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A common assumption for a structure that is subjected to an earthquake is that the structure is considered fixed at the base. In this thesis, analyses where the soil is deformed and the foundation may be moved and rotate have been done, and it has been investigated if this can reduce forces or displacements in the structure. This have been done through the use of soil-structure interaction (SSI). In this thesis well known beam-column element formulations will be presented, and the benefits and disadvantages will be briefly explained. Formulations for elements that are force-based and displacement-based with distributed plasticity are presented, as well as concentrated plasticity elements with fiber discretization. Both the physical and numerical definition of localization are explained, and regularization methods to prevent numerical localization have been discussed. A pushover analysis has been done for each of the element formulation in SeismoStruct, such that the effect of change in number of elements and spacing in stirrups could be examined. The pushover analyses were done for load in both one and two directions. At last, a 3D-model was used to see the effect of change in spacing in stirrups when excitation in two directions is applied.The attention is then brought over to use of SSI on structures, and the effect of applying this to a structure. An explanation on how to formulate SSI problem is given, and how to apply this in SeismoStruct through the use of link elements. These elements requires that a hysteresis curve is defined for each of the six degrees of freedom, and suitable models are presented. To model the soil's behavior, two models are used; the Ramberg-Osgood model and a linear model. To see the effect of SSI, a parameter study has been done. A study on how the results are changed by use of nonlinear horizontal springs, linear rocking springs, increased acceleration, smaller foundation and both linear horizontal and rocking springs have been done in SeismoStruct, by looking at one parameter at a time. Analyses where the structure was expanded by one floor, were also done, due to the possibility of seeing the effect of SSI in several places in the structure.Through the analyses that is done, it has been observed that by taking the soil stiffness into consideration, the forces and moments can be reduced. The best effect was shown by decreasing the size of foundation, for both one and two stories.
机译：对于遭受地震的结构，通常的假设是认为该结构固定在底部。本文对土壤变形以及地基可能移动和旋转的位置进行了分析，并研究了这种方法是否可以减小结构中的力或位移。这是通过使用土壤-结构相互作用（SSI）来完成的。在这篇论文中，将介绍众所周知的梁柱单元公式，并简要说明其优缺点。介绍了基于力和位移的具有可塑性分布的单元的配方，以及具有纤维离散化的集中可塑性单元的配方。解释了定位的物理和数值定义，并讨论了防止数值定位的正则化方法。已对SeismoStruct中的每种元素配方进行了推倒分析，从而可以检查元素数量和箍筋间距变化的影响。在一个方向和两个方向上都进行了推覆分析。最后，使用3D模型查看在两个方向上施加激励时箍筋间距变化的影响，然后将注意力转移到在结构上使用SSI以及将其应用于结构的效果。给出了如何制定SSI问题的说明，以及如何通过使用链接元素将其应用于SeismoStruct。这些元素要求为六个自由度中的每个自由度定义一个磁滞曲线，并提供合适的模型。为了模拟土壤的行为，使用了两个模型。 Ramberg-Osgood模型和线性模型。为了查看SSI的效果，已经进行了参数研究。在SeismoStruct中，通过一次查看一个参数，研究了如何通过使用非线性水平弹簧，线性摇摆弹簧，增加的加速度，较小的基础以及线性水平摇摆弹簧和摇摆弹簧来改变结果。由于可能在结构的多个位置看到SSI的影响，因此还进行了将结构扩展到一层的分析。通过进行分析，可以发现，考虑到土壤刚度，可以减少力和力矩。减小故事的规模对于一个故事和两个故事都显示出最佳效果。

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    Talberg Marte Sørbrøden;

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  • 年度 2015
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  • 正文语种 eng
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