Pile response to multi-directional lateral loading usingP–ycurves approach

Abstract

The most commonly used procedure for prediction of the behaviour of laterally loaded piles is the P–y curve formulation, which gives a simple but efficient framework to predict the response of the pile. This framework is limited to a single direction of loading, while there are several situations in which a pile is subjected to lateral loads with varying direction, as for example in the case of wind or wave loads. Here an extended framework for P–y curve modelling is presented, in which several springs are considered around the pile perimeter at each depth. The advantage of this framework is that it remains as simple and practical as the original P–y curve method and does not need any further information or parameters. A procedure is proposed for the extension of a given unidirectional model to the corresponding multi-directional one. The effects of multi-directional loading are discussed based on the simulation results. With a change in loading direction, misalignment between load direction and total displacement occurs. In addition, this quite simple model enables deduction of the profile of irreversible soil displacements around the pile at various depths.

Theoretical method for additional horizontal stress of isolation piles due to adjacent loading

“…[13][14][15][16][17] In addition, some studies paid attention to the lateral bearing capacity of piles under different loads. [18][19][20][21][22] Accounting for interaction between pile and soil, p-y method was used to obtain the stress characteristics. [23][24][25][26] Considering complex conditions in the interaction between pile and soil, other calculation models for calculating the ultimate soil pressure on pile were proposed.…”

“…The ultimate soil pressure could be calculated by empirical method, and its maximum value was proportional to the soil undrained shear strength 13–17 . In addition, some studies paid attention to the lateral bearing capacity of piles under different loads 18–22 . Accounting for interaction between pile and soil, p‐y method was used to obtain the stress characteristics 23–26 .…”

Combined loading of RC pile groups in clay accounting for N–M interaction

“…Although the behaviour of piles and pile groups has attracted the attention of researchers for decades (e.g., [6][7][8][9][10]), current design practice still considers the loads (vertical V, horizontal H, and overturning moment M) separately, typically neglecting their interaction. The literature on the bearing capacity of single piles under vertical or horizontal loading is vast, including analytical (e.g., [11][12][13][14]), empirical (e.g., [9,[15][16][17][18][19][20][21][22]), and numerical methods (e.g., [23][24][25]). [26] presented a comparative assessment of design and analysis methods, commonly adopted in practise, for the case of a pier founded on a monopile.…”

Cyclic Loading Test for the Small-Strain Shear Modulus of Saturated Soft Clay and Its Failure Mechanism

“…Thammathiwat and Chim-Oye [14] employed the cyclic triaxial test to study the interaction between the cyclic strength and the pore pressure of undisturbed Bangkok clay under various confining stresses, frequencies, and stress ratios. Meanwhile, several researchers have developed an uniaxial shear test instrument with multidirectional and looping capabilities to study the dynamic characteristics of soft clay [15][16][17]. These studies demonstrated that the dynamic shear modulus decreased, and the cyclic strain accumulation increased with an increase in CSR [18].…”