Nonlinear analyses of laterally loaded piles – A semi-analytical approach
Nonlinear analyses of laterally loaded piles – A semi-analytical approach
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DOI：
10.1016/j.compgeo.2015.07.009
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发表时间：
2015-10
影响因子：
5.3
通讯作者：
Fei Han;R. Salgado;M. Prezzi
中科院分区：
文献类型：
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作者：
Fei Han;R. Salgado;M. Prezzi
本文介绍了一种半解析的、基于连续介质力学的计算桩基在水平荷载作用下非线性响应的方法。土中的位移场是桩的挠度函数和位移衰减函数的乘积。基于虚功的增量形式，推导出桩身挠度和衰减函数的耦合微分方程组，然后用有限差分法求解，产生桩身挠度、剪力和弯矩，以及土域内的位移。土壤被建模为弹塑性材料。该分析是计算效率和产生的结果是在良好的协议，从三维有限元建模与相同的本构模型的土壤。该方法比传统的p-y方法更真实地模拟了横向加载桩的响应，计算成本相当。该方法比3D有限元模拟更有效。所提出的方法提供了一个很好的替代p-y方法的背景下，需要快速计算的横向桩响应，如在海上风电场桩的设计。
This paper describes a semi-analytical, continuum mechanics-based method of calculating the non-linear response of pile foundations subjected to lateral loads. The displacement field in the soil is obtained as the product of a pile deflection function and displacement decay functions. Based on the incremental form of the virtual work, a system of coupled differential equations for the pile deflection and decay functions is derived and then solved by using the finite difference method, producing pile deflections, shear forces and bending moments, as well as displacements within the soil domain. The soil is modeled as an elasto-plastic material. The analysis is computationally efficient and produces results that are in good agreement with those from 3D finite element modeling with the same constitutive model for the soil. The method models laterally loaded pile response more realistically than the traditional p–y method at a comparable computational cost. The method is substantially more efficient than 3D finite element simulations. The proposed method offers a good alternative to the p–y method in contexts in which fast calculation of lateral pile response is required, such as in the design of piles for offshore wind farms.