Trevor G. Davies

Bio: Trevor G. Davies is an academic researcher. The author has contributed to research in topics: Pile & Seismic loading. The author has an hindex of 6, co-authored 6 publications receiving 279 citations.

Nonlinear analysis of laterality loaded piles in cohesionless soils

Abstract: The results of a numerical analysis of single laterally loaded piles embedded in cohesionless soils, taking soil yielding into account, are presented. The analysis is intended to serve as an indepe...

Non-linear analysis of laterally loaded piles in heavily overconsolidated clays

Abstract: The results of a comprehensive study of the non-linear load-deformation response of laterally loaded single piles embedded in heavily overconsolidated clays are presented. These results show the influence of soil shear strength on both deformations and bending moments. Detailed discussions of soil properties, an illustrative example and a case history study are provided to facilitate application of these data to design. L'article presente les resultats d'une etude approfondie de la reponse a la deformation de chargement non-lineaire des pieux simples sollicites lateralement et encastres dans des argiles fortement surconsolidees. Ces resultats demontrent l'influence exercee par la resistance au cisaillement du sol sur les deformations et les moments de flexion. Des discussions detaillees des pro-prietes de sol, un exemple clair et un cas reel sont fournis pour faciliter l'application de ces donnees a la construction.

Analysis of Laterally Loaded Piles in Soft Clays

Abstract: The results of an alternative procedure to the p‐y method for the elastoplastic analysis of laterally loaded piles are presented. This analysis is based on the boundaryelement method and assumes kn...

Discussion of "Analysis of Laterally Loaded Piles in Soft Clays"

Abstract: The results of an alternative procedure to the p‐y method for the elastoplastic analysis of laterally loaded piles are presented. This analysis is based on the boundaryelement method and assumes kn...

Passive Pressure During Seismic Loading

Abstract: The results of a parametric study (based on a Mononobe-Okabe analysis) of passive earth pressure resistance of cohesionless soils under dynamic loading are presented. Since passive resistance decreases with increasing ground acceleration while the failure zone increases in size, retaining structures designed for static loading conditions may prove to be inadequate under seismic loading. The mathematical equivalence of the active and passive earth pressure problems is demonstrated and a number of ambiguities (surrounding the passive earth pressure problem) in the literature are resolved.

Response of stiff piles in sand to long-term cyclic lateral loading

Abstract: The driven monopile is currently the preferred foundation type for most offshore wind farms. While the static capacity of the monopile is important, a safe design must also address issues of accumulated rotation and changes in stiffness after long-term cyclic loading. Design guidance on this issue is limited. To address this, a series of laboratory tests were conducted where a stiff pile in drained sand was subjected to between 8000 and 60 000 cycles of combined moment and horizontal loading. A typical design for an offshore wind turbine monopile was used as a basis for the study, to ensure that pile dimensions and loading ranges were realistic. A complete non-dimensional framework for stiff piles in sand is presented, and applied to interpret the test results. The accumulated rotation was found to be dependent on relative density, and was strongly affected by the characteristics of the applied cyclic load. Particular loading characteristics were found to cause a significant increase in the accumulated ro...

Dynamic pile-soil-pile interaction. part i: analysis of axial vibration

Abstract: SUMMARY Simple methods of analysis are developed for computing the dynamic steady-state axial response of floating pile groups embedded in homogeneous and non-homogeneous soil deposits. Physically-motivated approximations are introduced to account for the interaction between two individual piles. It is found that such an interaction arises chiefly from the ‘interference’ of wave fields originating along each pile shaft and spreading outward. For homogeneous deposits the wave fronts originating at an individual pile are cylindrical and the interaction is essentially independent of pile flexibility and slenderness. For non-homogeneous deposits the wave fronts are non-cylindrical and ray-theory approximations are invoked to derive pile flexibility-dependent interaction functions. Results are presented for the dynamic stiffness and damping of several pile groups, as well as for distribution of the applied load among individual piles. For deposits with modulus proportional to depth, the agreement with the few rigorous solutions available is encouraging. A comprehensive parameter study focuses on the effects of soil inhomogeneity and pile-group configuration. It is demonstrated that the ‘dynamic group efficiency’ may far exceed unity at certain frequencies. Increasing soil inhomogeneity tends to reduce the respective resonant peaks and lead to smoother interaction functions, in qualitative agreement with field evidence.