砂堆积模型中的复杂高循环负荷

IF 3.4 2区 工程技术 Q2 ENGINEERING, GEOLOGICAL International Journal for Numerical and Analytical Methods in Geomechanics Pub Date : 2024-10-22 DOI:10.1002/nag.3871
Patrick Staubach, Lukas Knittel, Torsten Wichtmann
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引用次数: 0

摘要

实验证据表明,与等效的一维加载相比,土壤的多维循环加载会导致更大的变形累积。本研究在 120 次三轴和空心圆柱体试验中研究了砂土对 10,000 次循环和多达四维应力路径(即四个独立振荡分量)的高循环加载的响应,以扩展这些研究结果。随着振荡应力分量数量的增加,永久应变的累积也呈上升趋势。研究表明,高循环累积(HCA)模型中包含的多维应变振幅定义可以解释这一点。通过对承受多向循环荷载的海上风力涡轮机单桩基础的模型试验进行模拟,对复杂循环荷载的 HCA 模型进行了验证,并讨论了在 HCA 模型中考虑非恒定荷载振幅的空间可变循环荷载的问题。为此,介绍了考虑多应变振幅的 HCA 模型扩展。
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Complex High‐Cyclic Loading in an Accumulation Model for Sand
Experimental evidence indicates that multidimensional cyclic loading of soils causes larger accumulation of deformations than equivalent one‐dimensional loading. The response of sand to high‐cyclic loading with 10,000 cycles and up to four‐dimensional stress paths (i.e., four independent oscillating components) is examined in 120 triaxial and hollow cylinder tests in this work to extend these findings. With increasing number of oscillating stress components, the accumulation of permanent strains tends to increase. It is demonstrated that the definition of the multidimensional strain amplitude incorporated in the high‐cycle accumulation (HCA) model can account for this. The validation of the HCA model for complex cyclic loading is complemented by the simulation of model tests on monopile foundations of offshore wind turbines subjected to multidirectional cyclic loading, for which the consideration of spatially variable cyclic loading with nonconstant load amplitudes in the HCA model is discussed. For this purpose, an extension of the HCA model considering multiple strain amplitudes is presented.
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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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