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Parameters affecting laterally loaded piles in frozen soils by an efficient sensitivity analysis method

机译：一种有效灵敏度分析方法的参数对冻土中侧向荷载桩的影响

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In cold regions, accurately simulating the nonlinear responses of frozen soil-structure interaction (SSI) systems is of significant importance for the seismic safety assessment. This paper presents a finite element (FE) simulation of nonlinear lateral responses of a real reinforced-concrete filled steel pipe pile embedded in frozen ground at an outdoor test site in Fairbanks, Alaska. A presure-independent multi-yield surface J(2) plasticity model is used to simulate the frozen soil behavior, while frame element with fiber section and nonlinear steel/concrete model are used for the pile. The FE analysis results agree well with the experiment results. Furthermore, the response sensitivities to various inaterial parameters are computed by using an efficient and accurate-gradient computation method, i.e., direct differentiation method (DDM), with limited additional computational cost. Based on DDM, the relative importance of material parameters on system responses is studied when the system is subjected to varying lateral deflections, respectively (corresponding to different levels of lateral loads such as earthquakes). Stiffness-related parameters are dominant when the system is subject to small deflections, while strength-related or post-yield parameters become dominant for-large deflections-In addition, global responses are slightly more sensitive to material parameters of pile than the parameters of frozen soil. The response sensitivity to the unfrozen soil below the frozen ground crust is almost negligible. Finally, the response sensitivities to the soil parameters are observed to decrease when the distance of the soil from the pile increases. The sensitivity analysis methodology presented in this paper can be adapted to other frozen soil-pile interaction cases and the study results provide valuable insight for engineering practice. (C) 2015 Elsevier B.V. All rights reserved.
机译：在寒冷地区，准确模拟冻土-结构相互作用（SSI）系统的非线性响应对于地震安全评估具有重要意义。本文介绍了在阿拉斯加费尔班克斯的一个室外试验场中，实埋在冻土中的钢筋混凝土实心钢管桩的非线性横向响应的有限元（FE）模拟。使用与压力无关的多屈服面J（2）塑性模型来模拟冻土的行为，而使用具有纤维截面的框架单元和非线性钢/混凝土模型来进行桩的模拟。有限元分析结果与实验结果吻合良好。此外，通过使用有效且精确的梯度计算方法，即直接微分方法（DDM），以有限的额外计算成本来计算对各种天线参数的响应敏感性。基于DDM，研究了材料参数对系统响应的相对重要性，当系统分别经受不同的横向挠度（对应于不同水平的横向载荷，例如地震）时。当系统受到较小的挠度时，与刚度相关的参数占主导地位，而对于较大的挠度，强度相关的参数或屈服后参数成为主导因素。此外，整体响应对桩的材料参数的敏感性比冻结的参数稍高泥。对冻结的地壳以下的未冻结土壤的响应敏感性几乎可以忽略不计。最后，当土壤与桩之间的距离增加时，对土壤参数的响应灵敏度会降低。本文介绍的灵敏度分析方法可适用于其他冻土-桩相互作用的案例，研究结果为工程实践提供了宝贵的见识。 （C）2015 Elsevier B.V.保留所有权利。

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