Development of improved finite element formulations for pile group behavior analysis under cyclic loading

IF 3.4 2区 工程技术 Q2 ENGINEERING, GEOLOGICAL International Journal for Numerical and Analytical Methods in Geomechanics Pub Date : 2024-09-03 DOI:10.1002/nag.3828
Jian-Hong Wan, Shui-Hua Jiang, Xue-You Li, Zhilu Chang
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Abstract

The effect of cyclic loading is an essential factor leading to progressive soil strength degradation. Therefore, a comprehensive analysis of the pile-soil system behavior under cyclic loading is required to ensure the stability of pile group. There is room for improvement in the inherent constraint of the conventional numerical model in terms of approximating the soil resistance distribution along the pile by point loads at element nodes, necessitating a specific element that integrates considerations of pile group effect and cyclic loading within a unified framework. This study aims to develop a newly specific type of element for efficiently predicting nonlinear behavior within the pile-soil system, addressing simulations involving nonlinear pile-soil interaction, pile group effect, and cyclic loading. Modified element formulations based on soil stiffness matrices and soil resistance vectors specifically address pile group effect and consider parameters that influence pile behavior under cyclic lateral loading. The numerical solution procedure with Newton-Raphson iteration allows the calculation of pile responses in geometric and material nonlinear analyses. The validation of the proposed method includes several examples, comparing it with existing numerical solutions and experimental tests of single piles and pile groups under cyclic loading. These comparisons further support the consistency of the proposed method with measured data and validate its accuracy in considering group effect and cyclic loading. The parametric study illustrates the ability of the proposed method to capture cyclic loading parameters while considering the influence of the number and magnitude of load cycles, the cyclic load direction, and the installation methods.

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开发循环加载下桩群行为分析的改进型有限元公式
循环荷载的影响是导致土壤强度逐渐降低的一个重要因素。因此,需要对循环荷载下的桩土系统行为进行全面分析,以确保桩群的稳定性。传统数值模型的固有约束条件有待改进,即通过元素节点上的点荷载来近似沿桩的土体阻力分布,这就需要一种特定的元素,在统一的框架内综合考虑桩群效应和循环荷载。本研究旨在开发一种新的特定元素类型,用于有效预测桩土系统内的非线性行为,解决涉及非线性桩土相互作用、桩群效应和循环加载的模拟问题。基于土体刚度矩阵和土体阻力矢量的修正元素公式专门针对桩群效应,并考虑了在循环侧向加载下影响桩行为的参数。采用牛顿-拉夫逊迭代的数值求解程序可以计算几何和材料非线性分析中的桩响应。对所提方法的验证包括几个实例,将其与现有的数值解法以及循环荷载下单桩和桩群的实验测试进行比较。这些比较进一步证明了所提方法与测量数据的一致性,并验证了其在考虑群体效应和循环荷载时的准确性。参数研究表明,在考虑荷载循环次数和幅度、循环荷载方向以及安装方法的影响时,所提出的方法能够捕捉循环荷载参数。
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来源期刊
CiteScore
6.40
自引率
12.50%
发文量
160
审稿时长
9 months
期刊介绍: The journal welcomes manuscripts that substantially contribute to the understanding of the complex mechanical behaviour of geomaterials (soils, rocks, concrete, ice, snow, and powders), through innovative experimental techniques, and/or through the development of novel numerical or hybrid experimental/numerical modelling concepts in geomechanics. Topics of interest include instabilities and localization, interface and surface phenomena, fracture and failure, multi-physics and other time-dependent phenomena, micromechanics and multi-scale methods, and inverse analysis and stochastic methods. Papers related to energy and environmental issues are particularly welcome. The illustration of the proposed methods and techniques to engineering problems is encouraged. However, manuscripts dealing with applications of existing methods, or proposing incremental improvements to existing methods – in particular marginal extensions of existing analytical solutions or numerical methods – will not be considered for review.
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