Lateral Response Analysis of a Large‐Diameter Pile Under Combined Horizontal Dynamic and Axial Static Loads in Nonhomogeneous Soil

IF 3.4 2区 工程技术 Q2 ENGINEERING, GEOLOGICAL International Journal for Numerical and Analytical Methods in Geomechanics Pub Date : 2024-11-05 DOI:10.1002/nag.3884
Jie Jiang, Yonglin Ai, Lijun Chen, Wencheng Chai, Mingxi Chen, Xiaoduo Ou
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Abstract

The large diameter piles are widely used in structures such as offshore wind turbines due to their superior lateral load‐bearing capacity. To explore the lateral response of a large‐diameter pile under combined horizontal dynamic and axial static loads in nonhomogeneous soil, a simplified analytical model of the pile–soil interaction is developed. This model represents the pile as a Timoshenko beam resting on the Pasternak foundation, incorporating the double‐shear effect by considering both pile and soil shear. The governing matrix equations for the pile elements are derived from the principle of virtual work. Further, the pile's lateral deformations and internal forces are obtained using the modified finite beam element method (FBEM) and then validated through existing analytical solutions. Finally, the contribution of various properties of pile, soil, and applied load to the pile's lateral vibration response are performed. It is found that both pile and soil shear effects significantly impact the lateral dynamic response of a large‐diameter pile. Additionally, in nonhomogeneous soil, decreasing surface soil strength and dimensionless frequency lead to increased lateral displacements and bending moments of the pile, which are significantly affected by the P‐Δ effect under increasing axial load.
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非均质土中水平动荷载和轴向静荷载联合作用下的大直径桩侧向响应分析
大直径桩因其卓越的横向承载能力而被广泛应用于海上风力涡轮机等结构中。为了探索大直径桩在非均质土壤中水平动荷载和轴向静荷载共同作用下的横向响应,我们建立了一个简化的桩土相互作用分析模型。该模型将桩表示为静止在帕斯捷尔纳克地基上的蒂莫申科梁,同时考虑了桩和土的双重剪切效应。根据虚功原理推导出桩元素的支配矩阵方程。此外,还使用改进的有限梁元法(FBEM)获得了桩的侧向变形和内力,并通过现有的分析方法进行了验证。最后,研究了桩、土和外加荷载的各种特性对桩侧向振动响应的影响。研究发现,桩和土的剪切效应都会对大直径桩的横向动态响应产生重大影响。此外,在非均质土中,表面土强度和无量纲频率的降低会导致桩的侧向位移和弯矩增加,而在轴向荷载增加的情况下,桩的侧向位移和弯矩会受到 P-Δ 效应的显著影响。
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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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