Experimentelle Untersuchungen zur Verformungsakkumulation und Tragfähigkeitsreduktion von zyklisch belasteten Pfählen
type: CreativeWork
description: Confronted with the effects of wind and waves, the foundations for offshore wind turbines are exposed to cyclic and dynamic loads. In this respect, different types of driven pile foundations, either the monopile or the multi-pile foundation, are frequently envisaged as foundation systems. Depending on the chosen variant the piles transfer the loading in different ways into the subsoil. The monopile bears the lateral loads from wind and waves through its lateral bedding and the consequent subgrade reaction. On the other hand, the lateral actions generate pairs of tension and compression axial forces in the opposite piles of a multi-pile foundation. These axial forces will be carried into the subsoil by means of the shaft friction and, whenever possible, by the pile’s tip resistance. In order to design the piles for both the ultimate and the serviceability limit states, the transient loads resulting from wind and waves are often converted into an intended “equivalent”, usually sinusoidal, cyclic loading with constant amplitude and a lower number of cycles. However, this approach neglects any influence from the order of appearance of the original loads. The implications of this fact for the discrepancy between the design predictions and the actually occurring deformations or load capacity reductions have not yet been clarified. A significant point investigated in this work is therefore to assess the independence of the deformations and load carrying capacity changes due to cyclic loading of the order of appearance of different loads in drained conditions. For this purpose, a program of experimental tests has been carried out, which for the case of the laterally loaded single pile foundation was based on physical model tests in two different scales. The validity of the hypothesis of independence of the deformations of the order of different loads for a wide range of applications has been here investigated with a variation of pertinent soil and system parameters. It is a…
abstract: Confronted with the effects of wind and waves, the foundations for offshore wind turbines are exposed to cyclic and dynamic loads. In this respect, different types of driven pile foundations, either the monopile or the multi-pile foundation, are frequently envisaged as foundation systems. Depending on the chosen variant the piles transfer the loading in different ways into the subsoil. The monopile bears the lateral loads from wind and waves through its lateral bedding and the consequent subgrade reaction. On the other hand, the lateral actions generate pairs of tension and compression axial forces in the opposite piles of a multi-pile foundation. These axial forces will be carried into the subsoil by means of the shaft friction and, whenever possible, by the pile’s tip resistance. In order to design the piles for both the ultimate and the serviceability limit states, the transient loads resulting from wind and waves are often converted into an intended “equivalent”, usually sinusoidal, cyclic loading with constant amplitude and a lower number of cycles. However, this approach neglects any influence from the order of appearance of the original loads. The implications of this fact for the discrepancy between the design predictions and the actually occurring deformations or load capacity reductions have not yet been clarified. A significant point investigated in this work is therefore to assess the independence of the deformations and load carrying capacity changes due to cyclic loading of the order of appearance of different loads in drained conditions. For this purpose, a program of experimental tests has been carried out, which for the case of the laterally loaded single pile foundation was based on physical model tests in two different scales. The validity of the hypothesis of independence of the deformations of the order of different loads for a wide range of applications has been here investigated with a variation of pertinent soil and system parameters. It is a…
author: Georgi, Steven
language: de
license: https://creativecommons.org/licenses/by/4.0/
date published: 2017
date modified: 2026-07-27T21:28:37Z
provider: Technische Universität Berlin
publisher: Networked Digital Library of Theses and Dissertations
type: WebPage
source organization: Technische Universität Berlin

PropertyValue
property ID: DOI
value: 10.14279/depositonce-5942